Volume 01 - Properties and Selection Irons, Steels, and High-Performance Alloys Episode 11 pdf

• Machine tools should be rigid and in good condition. Any factors that encourage chatter are undesirable

•
Tools should be sharp. Dull tools cause excessive work hardening of the cut surface and accentuate the
difficulty in machining
• Low speeds of about 9 to 12 m/min (30 to 40 sfm) should be used. High speeds are likely to create red-
hot chips and to cause rapid tool breakdown
• Cobalt high-speed steel tools or tools with cemented carbide and ceramic inserts can be used.
The latter
are preferred
• The liberal use of a good grade of sulfur-bearing cutting oil is beneficial but not essential
•
In castings, holes should be formed by cores in the foundry, rather than by machining, whenever
possible
• Coolants are recommended for surface grinding operations
Various sources provide statements in favor of both positive-rake and negative-rake tools and both dry cutting and liquid
coolants. Because high temperatures at the cutting edge are a large part of the problem, effective cooling seems desirable.
Negative-rake tools are likely to require more force and thus to produce more heat. However, the thinner edge of a
positive-rake tool is more vulnerable to heat. Comparative machining data are presented in Table 17.
Table 17 Feed forces required in lathe turning of austenitic manganese steels
Specimens were 31.7 mm (1.25 in.) diam bars, toughened by water quenching. Roughing cuts 2.5 mm (0.098 in.) deep were taken
using complex-carbide tools c
ontaining about 15% TiC + TaC (predominantly TiC) and about 7 to 10% Co. New cutting edges were
used for each positive or negative rake. Cutting speed was 0.19 to 0.20 m/s (37 to 39 sfm).
Feed forces
Negative 7° rake Flat tool
Positive 6° rake
Horizontal

Vertical Horizontal

Vertical Horizontal
Vertical
Type of steel
N lbf kN lbf N lbf kN lbf kN lbf kN
lbf
1.12C-13Mn 670 150 1.58

355

780 175 1.58

355

1.13 255 1.67
375
3Ni-13Mn 620 140 1.53

345

. . . . . . . . . . . . 1.25 280 1.69
380
1Mo-13Mn 800 180 1.65

370

. . . . . . . . . . . . 1.09 245 1.71
385
1.12C-13Mn leaded
(a)
580 130 1.49

335

490 110 1.38

310

1.25 280 1.69
380
Wrought type 304 stainless
(b)


690 155 1.16

260

890 200 1.25

280

Welded to tool

Welded to tool

Cast CF-8 stainless
(b)
670 150 1.13

255

. . . . . . . . . . . . 2.25 505 2.56 575
Source: Ref 3
(a)

Recovery of 0.20% Pb from 0.35% added in ladle. The effect on machinability is inclusive.
(b)

Stainless steels suffer in comparison at this speed. They are more machinable at higher speeds and permit certain operations, such as drilling of
6.4 mm (
1
4
-in.) diam holes, which are very difficult with austenitic manganese steel. The type 304 stainless steel was cold finished.

Machinability is increased by the embrittlement that develops with reheating between about 540 and 650 °C (1000 and
1200 °F). Although not usually practicable, such a treatment may be useful if the part can subsequently be properly
toughened. Milling usually is not considered practicable.
Machinable Grade. A 20Mn-0.6C steel was developed specifically for improved machinability. Table 18 gives the
mechanical properties of this material. Even though the yield strength was deliberately reduced from 360 MPa (52 ksi) to
a value between 240 and 310 MPa (35 and 45 ksi) to obtain improved machinability, the ultimate tensile strength exceeds
620 MPa (90 ksi), and elongation in small castings may reach 40%. The heat treatment of this steel involves water
quenching from 1040 °C (1900 °F). As-cast properties are lower but are probably adequate for many applications.
Table 18 Typical room-temperature properties of machinable manganese steel
Tensile
strength
Yield
strength
Type Treatment

MPa ksi MPa ksi

Elongation,

%
Reduction

in area,
%
Hardness

HB
Magnetic
permeability,

Standard 13% Mn Toughened

825 120 360 52 40 35 200
1.01
Toughened

640-
855
93-
124
275-
310
40-
45
39-65 26-44 159-170
1.003
Machinable grade A, 20

Mn-0.6 C
As-cast 380-
580
55-84

275-
305
40-
44
13-22 24 159-170 1.003
Source: Abex Research Center
This nonmagnetic modified grade can be lathe turned, drilled, tapped, and threaded; even holes 6.4 mm (
1
4
in.) in
diameter can be drilled and tapped in this metal. In some machine shops, it is rated only slightly more difficult to drill
than plain 1020 steel, and the quality of the tapped threads is considered very good. Typical machining data for this steel
are presented in Table 19. Wear resistance has been sacrificed for machinability, and this grade has significantly less
abrasion resistance than do the various types in ASTM A 128.
Table 19 Force requirements for single-point lathe turning of austenitic manganese steel
Feed force
(a)

Horizontal Vertical
Type Condition
N lbf N lbf
Friction
coefficient

Standard 13% Mn As-cast 535-670

120-150

1225 275
0.64

Toughened 690 155 1310 295
0.76
As-cast 155-290

35-65 890-980 200-220

0.31-0.48
Machinable grade A (20% Mn)

Toughened

180-380

40-85 955-1000

215-225

0.33-0.57
Source: Abex Research Center
(a)

Depth of cut, 3 mm (0.1 in.) on radius; feed, 0.16 mm/rev (0.0062 in./rev); turning speed, 1.35 m/s (265 ft/min); 6° positive-rake tool.

Reference cited in this section
3.

H.S. Avery, Austenitic Manganese Steel, Metals Handbook, Vol 1, 8th ed., American Society for Metals,

1961
Austenitic Manganese Steels
Revised by D.K. Subramanyam,
*
Ergenics Inc.; A.E. Swansiger, ABC Rail Corporation; and H.S. Avery, Consultant

References
1. E.C. Bain, E.S Davenport, and W.S.N. Waring, The Equilibrium Diagram of Iron-Manganese-
Carbon
Alloys of Commercial Purity, Trans. AIME, Vol 100, 1932, p 228
2. C.H. Shih, B.L. Averbach, and M. Cohen, Work Hardeni
ng and Martensite Formation in Austenitic
Manganese Alloys, Research Report, Massachusetts Institute of Technology, 1953
3. H.S. Avery, Austenitic Manganese Steel, Metals Handbook,
Vol 1, 8th ed., American Society for Metals,
1961
4. H.S. Avery, Work Hardening in Relation to Abrasion Resistance, in
Proceedings of the Symposium on
Materials for the Mining Industry, published by Climax Molybdenum Company, 1974, p 43
5. Manganese Steel, Oliver and Boyd, for Hadfields Ltd., 1956
6. H.S. Avery and H.J. Chapin, Austenitic Manganese Steel Welding Electrodes, Weld. J.,
Vol 33, 1954, p
459
7.
F. Borik and W.G. Scholz, Gouging Abrasion Test for Materials Used in Ore and Rock Crushing, Part II,

J. Mater., Vol 6 (No. 3), Sept 1971, p 590
8. M. Fujikura, Recent Developments of Austenitic Manganese Steels for Non-
Magnetic and Cryogenic
Applications in Japan, The Manganese Center, Paris 1984
9. D.J. Schmatz, Structure and Properties of Austenitic Alloys Containing Aluminum and Silicon,
Trans.
ASM, Vol 52, 1960, p 898
10. J. Charles and A. Berghezan, Nickel-Free Austenitic Steels for Cryogenic Applications: The Fe-23% Mn-
5% Al-0.2% C Alloys, Cryogenics, May 1981, p 278
11. R. Wang and F.H. Beck, New Stainless Steel Without Nickel or Chromium for Marine Applications,
Met.
Prog., March 1983, p 72
12. J.C. Benz and H.W. Leavenworth, Jr., An Assessment of Fe-Mn-
Al Alloys as Substitutes for Stainless
Steels, J. Met., March 1985, p 36
13. W.J. Jackson and M.W. Hubbard, Steelmaking for Steelfounders, Steel Castings Researc
h and Trade
Association, 1979, p 106
14. R. Castro and P. Garnier, Some Decomposition Structures of Austenitic Manganese Steels,
Rev. Métall.,
Cah. Inf. Tech., Vol 55, Jan 1958, p 17
15. D. Rittel and I. Roman, Tensile Fracture of Coarse-Grained Cast Austenitic Manganese Steels,
Metall.
Trans. A, Vol 19A, Sept 1988, p 2269-2277
16. P.H. Adler, G.B. Olson, and W.S. Owen, Strain Hardening of Hadfield Manganese Steel, Metall. Trans. A,

Vol 17A, Oct 1986, p 1725
17. H.C. Doepken, Tensile Properties of Wroug
ht Austenitic Manganese Steel in the Temperature Range from
+100 °C to -196 °C, J. Met., Trans. AIME, Feb 1952, p 166

18.
K.S. Raghavan, A.S. Sastri, and M.J. Marcinkowski, Nature of the Work Hardening Behaviour in
Hadfield's Manganese Steel, Trans. TSM-AIME, Vol 245, July 1969, p 1569
19. Y.N. Dastur and W.C. Leslie, Mechanism of Work Hardening in Hadfield Manganese Steel, Metall.
Trans.
A., Vol 12A, May 1981, p 749
20. B.K. Zuidema, D.K. Subramanyam, and W.C. Leslie, The Effect of Aluminum on the Work
Hardening
and Wear Resistance of Hadfield Manganese Steel, Metall. Trans. A, Vol 18A, Sept 1987, p 1629
21. Abex Research Center, Abex Corporation, unpublished research, 1981-1983
22. H.S. Avery, Austenitic Manganese Steel, American Brakeshoe Company, 19
49, condensed version in
Metals Handbook, American Society for Metals, 1948, p 526-534
23. T.E. Norman, Eng. Mining J., July, 1957, p 102
24.
R. Blickensderfer, B.W. Madsen, and J.H. Tylczak, Comparison of Several Types of Abrasive Wear Tests,
in Wear of Materials 1985, K.C. Ludema, Ed., American Society of Mechanical Engineers, p 313
25.
D.E. Diesburg and F. Borik, Optimizing Abrasion Resistance and Toughness in Steels and Irons for the
Mining Industry, in Proceedings of the Symposium on Materials for the Mining Industry,
Climax
Molybdenum Company, 1974, p 15
26.
U. Bryggman, S. Hogmark, and O. Vingsbo, Abrasive Wear Studied in a Modified Impact Testing
Machine, Wear of Materials, 1979, p 292
27. "The Physical Properties of a Series of Steels, Part II,
" Special Report 23, Alloy Steels Research
Committee, British Iron and Steel Institute, Sept 1946
28. Metals and Their Weldability, Vol 4, 7th ed., Welding Handbook, American Welding Society, 1982, p 195

Wrought Stainless Steels
Revised by S.D. Washko and G. Aggen, Allegheny Ludlum Steel, Division of Allegheny Ludlum Corporation

Introduction
STAINLESS STEELS are iron-base alloys containing at least 10.5% Cr. Few stainless steels contain more than 30% Cr
or less than 50% Fe. They achieve their stainless characteristics through the formation of an invisible and adherent
chromium-rich oxide surface film. This oxide forms and heals itself in the presence of oxygen. Other elements added to
improve particular characteristics include nickel, molybdenum, copper, titanium, aluminum, silicon, niobium, nitrogen,
sulfur, and selenium. Carbon is normally present in amounts ranging from less than 0.03% to over 1.0% in certain
martensitic grades.
The selection of stainless steels may be based on corrosion resistance, fabrication characteristics, availability, mechanical
properties in specific temperature ranges and product cost. However, corrosion resistance and mechanical properties are
usually the most important factors in selecting a grade for a given application.
Original discoveries and developments in stainless steel technology began in England and Germany about 1910. The
commercial production and use of stainless steels in the United States began in the 1920s, with Allegheny, Armco,
Carpenter, Crucible, Firth-Sterling, Jessop, Ludlum, Republic, Rustless, and U.S. Steel being among the early producers.
Only modest tonnages of stainless steel were produced in the United States in the mid-1920s, but annual production has
risen steadily since that time. Even so, tonnage has never exceeded about 1.5% of total production for the steel industry.
Table 1 shows shipments of stainless steel over a recent 10-year period. Production tonnages are listed only for U.S.
domestic production. France, Italy, Japan, Sweden, the United Kingdom, and West Germany produce substantial tonnages
of steel, and data on production in these countries are also available. However, other free-world countries do not make
their figures public, and production statistics are not available from the U.S.S.R. or other Communist nations, which
makes it impossible to estimate accurately the total world production of stainless steel.
Table 1 Total U.S. shipments of stainless steel over the 10-year period from 1979 to 1988

Shipments
Year
kt
1000 tons

1979 1234

1361
1980
(a)


1022

1127
1981
(a)


1055

1163
1982
(a)


811
894
1983
(a)


1032

1137

1984
(a)


1132

1248
1985
(a)


1135

1251
1986
(a)


1077

1187
1987
(a)


1287

1418
1988
(b)

1439

1586

(a)

Ref 1.
(b)

Ref 2

The development of precipitation-hardenable stainless steels was spearheaded by the successful production of Stainless W
by U.S. Steel in 1945. Since then, Armco, Allegheny-Ludlum, and Carpenter Technology have developed a series of
precipitation-hardenable alloys.
The problem of obtaining raw materials has been a real one, particularly in regard to nickel during the 1950s when civil
wars raged in Africa and Asia, prime sources of nickel, and Cold War politics played a role because Eastern-bloc nations
were also prime sources of the element. This led to the development of a series of alloys (AISI 200 type) in which
manganese and nitrogen are partially substituted for nickel. These stainless steels are still produced today.
New refining techniques were adopted in the early 1970s that revolutionized stainless steel melting. Most important was
the argon-oxygen-decarburization (AOD) process. The AOD and related processes, with different gas injections or partial
pressure systems, permitted the ready removal of carbon without substantial loss of chromium to the slag. Furthermore,
low carbon contents were readily achieved in 18% Cr alloys when using high-carbon ferrochromium in furnace charges in
place of the much more expensive low-carbon ferrochromium. Major alloying elements could also be controlled more
precisely, nitrogen became an easily controlled intentional alloying element, and sulfur could be reduced to exceptionally
low levels when desired. Oxygen could also be reduced to low levels and, when coupled with low sulfur, resulted in
marked improvements in steel cleanliness.
During the same period, continuous casting grew in popularity throughout the steel industry, particularly in the stainless
steel segment. The incentive for continuous casting was primarily economic. Piping can be confined to the last segment to

be cast such that yield improvements of approximately 10% are commonly achieved. Improvements in homogeneity are
also attained.
Over the years, stainless steels have become firmly established as materials for cooking utensils, fasteners cutlery,
flatware, decorative architectural hardware, and equipment for use in chemical plants, dairy and food-processing plants,
health and sanitation applications, petroleum and petrochemical plants, textile plants, and the pharmaceutical and
transportation industries. Some of these applications involve exposure to either elevated or cryogenic temperatures;
austenitic stainless steels are well suited to either type of service. Properties of stainless steels at elevated temperatures are
discussed in the section "Elevated-Temperature Properties" of this article and more detailed information is available in the
article "Elevated-Temperature Properties of Stainless Steels" in this Volume. Properties at cryogenic temperatures are
discussed in the section "Subzero-Temperature Properties" of this article.
Modifications in composition are sometimes made to facilitate production. For instance, basic compositions are altered to
make it easier to produce stainless steel tubing and castings. Similar modifications are made for the manufacture of
stainless steel welding electrodes; here, combinations of electrode coating and wire composition are used to produce
desired compositions in deposited weld metal.

References
1.

Metal Statistics: 1988, American Metal Market, Fairchild Publications, 1988

2.

1988 Annual Statistical Report, American Iron and Steel Institute, 1989
Wrought Stainless Steels
Revised by S.D. Washko and G. Aggen, Allegheny Ludlum Steel, Division of Allegheny Ludlum Corporation

Classification of Stainless Steels
Stainless steels are commonly divided into five groups: martensitic stainless steels, ferritic stainless steels, austenitic
stainless steels, duplex (ferritic-austenitic) stainless steels, and precipitation-hardening stainless steels.
Martensitic stainless steels are essentially alloys of chromium and carbon that possess a distorted body-centered

cubic (bcc) crystal structure (martensitic) in the hardened condition. They are ferromagnetic, hardenable by heat
treatments, and are generally resistant to corrosion only to relatively mild environments. Chromium content is generally
in the range of 10.5 to 18%, and carbon content may exceed 1.2%. The chromium and carbon contents are balanced to
ensure a martensitic structure after hardening. Excess carbides may be present to increase wear resistance or to maintain
cutting edges, as in the case of knife blades. Elements such as niobium, silicon, tungsten, and vanadium may be added to
modify the tempering response after hardening. Small amounts of nickel may be added to improve corrosion resistance in
some media and to improve toughness. Sulfur or selenium is added to some grades to improve machinability.
Ferritic stainless steels are essentially chromium containing alloys with bcc crystal structures. Chromium content is
usually in the range of 10.5 to 30%. Some grades may contain molybdenum, silicon, aluminum, titanium, and niobium to
confer particular characteristics. Sulfur or selenium may be added, as in the case of the austenitic grades, to improve
machinability. The ferritic alloys are ferromagnetic. They can have good ductility and formability, but high-temperature
strengths are relatively poor compared to the austenitic grades. Toughness may be somewhat limited at low temperatures
and in heavy sections.
Austenitic stainless steels have a face-centered cubic (fcc) structure. This structure is attained through the liberal use
of austenitizing elements such as nickel, manganese, and nitrogen. These steels are essentially nonmagnetic in the
annealed condition and can be hardened only by cold working. They usually possess excellent cryogenic properties and
good high-temperature strength. Chromium content generally varies from 16 to 26%; nickel, up to about 35%; and
manganese, up to 15%. The 2xx series steels contain nitrogen, 4 to 15.5% Mn, and up to 7% Ni. The 3xx types contain
larger amounts of nickel and up to 2% Mn. Molybdenum, copper, silicon, aluminum, titanium, and niobium may be added
to confer certain characteristics such as halide pitting resistance or oxidation resistance. Sulfur or selenium may be added
to certain grades to improve machinability.
Duplex stainless steels have a mixed structure of bcc ferrite and fcc austenite. The exact amount of each phase is a
function of composition and heat treatment (see the article "Cast Stainless Steels" in this Volume). Most alloys are
designed to contain about equal amounts of each phase in the annealed condition. The principal alloying elements are
chromium and nickel, but nitrogen, molybdenum, copper, silicon, and tungsten may be added to control structural balance
and to impart certain corrosion-resistance characteristics.
The corrosion resistance of duplex stainless steels is like that of austenitic stainless steels with similar alloying contents.
However, duplex stainless steels possess higher tensile and yield strengths and improved resistance to stress-corrosion
cracking than their austenitic counterparts. The toughness of duplex stainless steels is between that of austenitic and
ferritic stainless steels.

Precipitation-hardening stainless steels are chromium-nickel alloys containing precipitation-hardening elements
such as copper, aluminum, or titanium. Precipitation-hardening stainless steels may be either austenitic or martensitic in
the annealed condition. Those that are austenitic in the annealed condition are frequently transformable to martensite
through conditioning heat treatments, sometimes with a subzero treatment. In most cases, these stainless steels attain high
strength by precipitation hardening of the martensitic structure.
Standard Types. A list of standard types of stainless steels, similar to those originally published by the American Iron
and Steel Institute (AISI), appears in Table 2. The criteria used to decide which types of stainless steel are standard types
have been rather loosely defined but include tonnage produced during a specific period, availability (number of
producers), and compositional limits. Specification-writing organizations such as ASTM and SAE include these standard
types in their specifications. In referring to specific compositions, the term type is preferred over the term grade. Some
specifications establish a series of grades within a given type, which makes it possible to specify properties more
precisely for a given nominal composition.
Table 2 Compositions of standard stainless steels
Composition, %
(a)

Type UNS
designation

C Mn Si Cr Ni P S
Other
Austenitic Types
201 S20100 0.15 5.5-7.5

1.00 16.0-
18.0
3.5-5.5

0.06 0.03
0.25 N

202 S20200 0.15 7.5-
10.0
1.00 17.0-
19.0
4.0-6.0

0.06 0.03
0.25 N
205 S20500 0.12-14.0-1.00 16.5-1.0-0.06 0.03
0.32-0.40 N
0.25 15.5 18.0 1.75
301 S30100 0.15 2.00 1.00 16.0-
18.0
6.0-8.0

0.045

0.03
. . .
302 S30200 0.15 2.00 1.00 17.0-
19.0
8.0-
10.0
0.045

0.03
. . .
302B S30215 0.15 2.00 2.0-
3.0
17.0-

19.0
8.0-
10.0
0.045

0.03
. . .
303 S30300 0.15 2.00 1.00 17.0-
19.0
8.0-
10.0
0.20 0.15
min
0.6 Mo
(b)

303Se S30323 0.15 2.00 1.00 17.0-
19.0
8.0-
10.0
0.20 0.06
0.15 min Se
304 S30400 0.08 2.00 1.00 18.0-
20.0
8.0-
10.5
0.045

0.03
. . .

304H S30409 0.04-
0.10
2.00 1.00 18.0-
20.0
8.0-
10.5
0.045

0.03
. . .
304L S30403 0.03 2.00 1.00 18.0-
20.0
8.0-
12.0
0.045

0.03
. . .
304LN S30453 0.03 2.00 1.00 18.0-
20.0
8.0-
12.0
0.045

0.03
0.10-0.16 N
302Cu S30430 0.08 2.00 1.00 17.0-
19.0
8.0-
10.0

0.045

0.03
3.0-4.0 Cu
304N S30451 0.08 2.00 1.00 18.0-
20.0
8.0-
10.5
0.045

0.03
0.10-0.16 N
305 S30500 0.12 2.00 1.00 17.0-
19.0
10.5-
13.0
0.045

0.03
. . .
308 S30800 0.08 2.00 1.00 19.0-
21.0
10.0-
12.0
0.045

0.03
. . .
309 S30900 0.20 2.00 1.00 22.0-
24.0

12.0-
15.0
0.045

0.03
. . .
309S S30908 0.08 2.00 1.00 22.0-
24.0
12.0-
15.0
0.045

0.03
. . .
310 S31000 0.25 2.00 1.50 24.0-
26.0
19.0-
22.0
0.045

0.03
. . .
310S S31008 0.08 2.00 1.50 24.0-
26.0
19.0-
22.0
0.045

0.03
. . .

314 S31400 0.25 2.00 1.5-
3.0
23.0-
26.0
19.0-
22.0
0.045

0.03
. . .
316 S31600 0.08 2.00 1.00 16.0-
18.0
10.0-
14.0
0.045

0.03
2.0-3.0 Mo
316F S31620 0.08 2.00 1.00 16.0-
18.0
10.0-
14.0
0.20 0.10
min
1.75-2.5 Mo
316H S31609 0.04-
0.10
2.00 1.00 16.0-
18.0
10.0-

14.0
0.045

0.03
2.0-3.0 Mo
316L S31603 0.03 2.00 1.00 16.0-
18.0
10.0-
14.0
0.045

0.03
2.0-3.0 Mo
316LN S31653 0.03 2.00 1.00 16.0-
18.0
10.0-
14.0
0.045

0.03
2.0-3.0 Mo; 0.10-0.16 N
316N S31651 0.08 2.00 1.00 16.0-
18.0
10.0-
14.0
0.045

0.03
2.0-3.0 Mo; 0.10-0.16 N
317 S31700 0.08 2.00 1.00 18.0-

20.0
11.0-
15.0
0.045

0.03
3.0-4.0 Mo
317L S31703 0.03 2.00 1.00 18.0-
20.0
11.0-
15.0
0.045

0.03
3.0-4.0 Mo
321 S32100 0.08 2.00 1.00 17.0-
19.0
9.0-
12.0
0.045

0.03
5 × %C min Ti
321H S32109 0.04-
0.10
2.00 1.00 17.0-
19.0
9.0-
12.0
0.045

0.03
5 × %C min Ti
330 N08330 0.08 2.00 0.75-
1.5
17.0-
20.0
34.0-
37.0
0.04 0.03
. . .
347 S34700 0.08 2.00 1.00 17.0-
19.0
9.0-
13.0
0.045

0.03
10 × %C min Nb
347H S34709 0.04-
0.10
2.00 1.00 17.0-
19.0
9.0-
13.0
0.045

0.03
8 × %C min - 1.0 max Nb
348 S34800 0.08 2.00 1.00 17.0-

19.0
9.0-
13.0
0.045

0.03
0.2 Co; 10 × %C min Nb; 0.10 Ta
348H S34809 0.04-
0.10
2.00 1.00 17.0-
19.0
9.0-
13.0
0.045

0.03
0.2 Co; 8 × %C min - 1.0 max Nb;
0.10 Ta
384 S38400 0.08 2.00 1.00 15.0-
17.0
17.0-
19.0
0.045

0.03
. . .
Ferritic types
405 S40500 0.08 1.00 1.00 11.5-
14.5
. . . 0.04 0.03

0.10-0.30 Al
409 S40900 0.08 1.00 1.00 10.5-
11.75
0.50 0.045

0.045
6 × %C min - 0.75 max Ti
429 S42900 0.12 1.00 1.00 14.0-
16.0
. . . 0.04 0.03
. . .
430 S43000 0.12 1.00 1.00 16.0-
18.0
. . . 0.04 0.03
. . .
430F S43020 0.12 1.25 1.00 16.0-
18.0
. . . 0.06 0.15
min
0.6 Mo
(b)

430FSe S43023 0.12 1.25 1.00 16.0-
18.0
. . . 0.06 0.06
0.15 min Se
434 S43400 0.12 1.00 1.00 16.0-
18.0
. . . 0.04 0.03
0.75-1.25 Mo

436 S43600 0.12 1.00 1.00 16.0-
18.0
. . . 0.04 0.03
0.75-1.25 Mo; 5 × %C min - 0.70
max Nb
439 S43035 0.07 1.00 1.00 17.0-
19.0
0.50 0.04 0.03
0.15 Al; 12 × %C min - 1.10 Ti
442 S44200 0.20 1.00 1.00 18.0-
23.0
. . . 0.04 0.03
. . .
444 S44400 0.025 1.00 1.00 17.5-
19.5
1.00 0.04 0.03
1.75-2.50 Mo; 0.025 N; 0.2 + 4 (%C
+ %N) min - 0.8 max (Ti + Nb)
446 S44600 0.20 1.50 1.00 23.0-
27.0
. . . 0.04 0.03
0.25 N
Duplex (ferritic-austenitic) type
329 S32900 0.20 1.00 0.75 23.0-
28.0
2.50-
5.00
0.040

0.030

1.00-2.00 Mo
Martensitic types
403 S40300 0.15 1.00 0.50 11.5-
13.0
. . . 0.04 0.03
. . .
410 S41000 0.15 1.00 1.00 11.5-
13.5
. . . 0.04 0.03
. . .
414 S41400 0.15 1.00 1.00 11.5-
13.5
1.25-
2.50
0.04 0.03
. . .
416 S41600 0.15 1.25 1.00 12.0-
14.0
. . . 0.06 0.15
min
0.6 Mo
(b)

416Se S41623 0.15 1.25 1.00 12.0-
14.0
. . . 0.06 0.06
0.15 min Se
420 S42000 0.15
min
1.00 1.00 12.0-

14.0
. . . 0.04 0.03
. . .
420F S42020 0.15
min
1.25 1.00 12.0-
14.0
. . . 0.06 0.15
min
0.6 Mo
(b)

422 S42200 0.20-
0.25
1.00 0.75 11.5-
13.5
0.5-1.0

0.04 0.03
0.75-1.25 Mo; 0.75-1.25 W; 0.15-0.3
V
431 S43100 0.20 1.00 1.00 15.0-
17.0
1.25-
2.50
0.04 0.03
. . .
440A S44002 0.60-
0.75
1.00 1.00 16.0-

18.0
. . . 0.04 0.03
0.75 Mo
440B S44003 0.75-
0.95
1.00 1.00 16.0-
18.0
. . . 0.04 0.03
0.75 Mo
440C S44004 0.95-
1.20
1.00 1.00 16.0-
18.0
. . . 0.04 0.03
0.75 Mo
Precipitation-hardening types
PH 13-8 S13800 0.05 0.20 0.10 12.25-7.5-8.5

0.01 0.008
2.0-2.5 Mo; 0.90-1.35 Al; 0.01 N
Mo 13.25
15-5 PH S15500 0.07 1.00 1.00 14.0-
15.5
3.5-5.5

0.04 0.03
2.5-4.5 Cu; 0.15-0.45 Nb
17-4 PH S17400 0.07 1.00 1.00 15.5-
17.5
3.0-5.0

0.04 0.03
3.0-5.0 Cu; 0.15-0.45 Nb
17-7 PH S17700 0.09 1.00 1.00 16.0-
18.0
6.5-
7.75
0.04 0.04 0.75-1.5 Al

(a)

Single values are maximum values unless otherwise indicated.
(b)

Optional

In each of the three original groups of stainless steels austenitic, ferritic, and martensitic there is one composition that
represents the basic, general-purpose alloy. All other compositions derive from this basic alloy, with specific variations in
composition being made to impart very specific properties. The so-called family relationships for these three groups are
summarized in Fig. 1, 2, and 3. Type 329 is a duplex stainless steel (about 80% ferrite, 20% austenite as annealed) and is
listed separately in Table 2.

Fig. 1 Family relationships for standard austenitic stainless steels

Fig. 2 Family relationships for standard ferritic stainless steels

Fig. 3 Family relationships for standard martensitic stainless steels
Nonstandard Types. In addition to the standard types, many proprietary stainless steels are used for specific
applications. Compositions of the more popular, nonstandard stainless steels are given in Table 3; some of the
nonstandard grades are identified by AISI type numbers.

Table 3 Compositions of nonstandard stainless steels
Composition, %
(b)

Designation
(a)
UNS
designation

C Mn Si Cr Ni P S
Other
Austenitic stainless steels
Gall-Tough S20161 0.15 4.00-
6.00
3.00-
4.00
15.00-
18.00
4.00-
6.00
0.040

0.040
0.08-0.20 N
203 EZ (XM-1) S20300 0.08 5.0-6.5 1.00 16.0-
18.0
5.0-6.5 0.040

0.18-
0.35

0.5 Mo; 1.75-2.25 Cu
Nitronic 50 (XM-
19)
S20910 0.06 4.0-6.0 1.00 20.5-
23.5
11.5-
13.5
0.040

0.030
1.5-3.0 M; 0.2-0.4 N; 0.1-0.3
Nb; 0.1-0.3 V
Tenelon (XM-31) S21400 0.12 14.5-
16.0
0.3-
1.0
17.0-
18.5
0.75 0.045

0.030
0.35 N
Cryogenic Tenelon
(XM-14)
S21460 0.12 14.0-
16.0
1.00 17.0-
19.0
5.0-6.0 0.060

0.030
0.35-0.50 N
Esshete 1250 S21500 0.15 5.5-7.0 1.20 14.0-
16.0
9.0-11.0

0.040

0.030
0.003-0.009 B; 0.75-1.25 Nb;
0.15-0.40 V
Type 216 (XM-17)

S21600 0.08 7.5-9.0 1.00 17.5-
22.0
5.0-7.0 0.045

0.030
2.0-3.0 Mo; 0.25-0.50 N
Type 216 L (XM-
18)
S21603 0.03 7.5-9.0 1.00 17.5-
22.0
7.5-9.0 0.045

0.030
2.0-3.0 Mo; 0.25-0.50 N
Nitronic 60 S21800 0.10 7.0-9.0 3.5-
4.5
16.0-

18.0
8.0-9.0 0.040

0.030
0.08-0.18 N
Nitronic 40 (XM-
10)
S21900 0.08 8.0-10.0

1.00 19.0-
21.5
5.5-7.5 0.060

0.030
0.15-0.40 N
21-6-9 LC S21904 0.04 8.00-
10.00
1.00 19.00-
21.50
5.50-
7.50
0.060

0.030
0.15-0.40 N
Nitronic 33 (18-3-
Mn)
S24000 0.08 11.50-
14.50
1.00 17.00-

19.00
2.50-
3.75
0.060

0.030
0.20-0.40 N
Nitronic 32 (18-2-
Mn)
S24100 0.15 11.00-
14.00
1.00 16.50-
19.50
0.50-
2.50
0.060

0.030
0.20-0.45 N
18-18 Plus S28200 0.15 17.0-
19.0
1.00 17.5-
19.5
. . . 0.045

0.030
0.5-1.5 Mo; 0.5-1.5 Cu; 0.4-
0.6 N
303 Plus X (XM-
5)

S30310 0.15 2.5-4.5 1.00 17.0-
19.0
7.0-10.0

0.020

0.25
min
0.6 Mo
MVMA
(c)
S30415 0.05 0.60 1.30 18.5 9.50 . . . . . .
0.15 N; 0.04 Ce
304BI
(d)
S30424 0.08 2.00 0.75 18.00-
20.00
12.00-
15.00
0.045

0.030
0.10 N; 1.00-1.25 B
304 HN (XM-21) S30452 0.04-
0.10
2.00 1.00 18.0-
20.0
8.0-10.5

0.045

0.030
0.16-0.30 N
Cronifer 1815
LCSi
S30600 0.018 2.00 3.7-
4.3
17.0-
18.5
14.0-
15.5
0.020

0.020
0.2 Mo
RA 85 H
(c)
S30615 0.20 0.80 3.50 18.5 14.50 . . . . . .
1.0 Al
253 MA S30815 0.05-
0.10
0.80 1.4-
2.0
20.0-
22.0
10.0-
12.0
0.040

0.030

0.14-0.20 N; 0.03-0.08 Ce;
1.0 Al
Type 309 S Cb S30940 0.08 2.00 1.00 22.0-
24.0
12.0-
15.0
0.045

0.030
10 × %C min to 1.10 max
Nb
Type 310 Cb S31040 0.08 2.00 1.50 24.0-
26.0
19.0-
22.0
0.045

0.030
10 × %C min to 1.10 max
Nb + Ta
254 SMO S31254 0.020 1.00 0.80 19.50-
20.50
17.50-
18.50
0.030

0.010
6.00-6.50 Mo; 0.50-1.00 Cu;
0.180-0.220 N
Type 316 Ti S31635 0.08 2.00 1.00 16.0-

18.0
10.0-
14.0
0.045

0.030
5 × %(C + N) min to 0.70
max Ti; 2.0-3.0 Mo; 0.10 N
Type 316 Cb S31640 0.08 2.00 1.00 16.0-
18.0
10.0-
14.0
0.045

0.030
10 × %C min to 1.10 max
Nb + Ta; 2.0-3.0 Mo; 0.10 N

Type 316 HQ . . . 0.030 2.00 1.00 16.00-
18.25
10.00-
14.00
0.030

0.015
3.00-4.00 Cu; 2.00-3.00 Mo
Type 317 LM S31725 0.03 2.00 1.00 18.0-
20.0
13.5-
17.5

0.045

0.030
4.0-5.0 Mo; 0.10 N
17-14-4 LN S31726 0.03 2.00 0.75 17.0-
20.0
13.5-
17.5
0.045

0.030
4.0-5.0 Mo; 0.10-0.20 N
Type 317 LN S31753 0.03 2.00 1.00 18.0-
20.0
11.0-
15.0
0.030

0.030
3.0-4.0 Mo; 0.10-0.22 N
Type 370 S37000 0.03-
0.05
1.65-
2.35
0.5-
1.0
12.5-
14.5
14.5-
16.5

0.040

0.010
1.5-2.5 Mo; 0.1-0.4 Ti; 0.005
N; 0.05 Co
18-18-2 (XM-15) S38100 0.08 2.00 1.5-
2.5
17.0-
19.0
17.5-
18.5
0.030

0.030
. . .
19-9 DL S63198 0.28-
0.35
0.75-
1.50
0.03-
0.8
18.0-
21.0
8.0-11.0

0.040

0.030
1.0-1.75 Mo; 0.1-0.35 Ti;
1.0-1.75 W; 0.25-0.60 Nb

20Cb-3 N08020 0.07 2.00 1.00 19.0-
21.0
32.0-
38.0
0.045

0.035
2.0-3.0 Mo; 3.0-4.0 Cu; 8 ×
%C min to 1.00 max Nb
20Mo-4 N08024 0.03 1.00 0.50 22.5-
25.0
35.0-
40.0
0.035

0.035
3.50-5.00 Mo; 0.50-1.50 Cu;
0.15-0.35 Nb
20Mo-6 N08026 0.03 1.00 0.50 22.00-
26.00
33.00-
37.20
0.03 0.03
5.00-6.70 Mo; 2.00-4.00 Cu
Sanicro 28 N08028 0.02 2.00 1.00 26.0-
28.0
29.5-
32.5
0.020

0.015
3.0-4.0 Mo; 0.6-1.4 Cu
AL-6X N08366 0.035 2.00 1.00 20.0-
22.0
23.5-
25.5
0.030

0.030
6.0-7.0 Mo
AL-6XN N08367 0.030 2.00 1.00 20.0-
22.0
23.50-
25.50
0.040

0.030
6.00-7.00 Mo; 0.18-0.25 N
JS-700 N08700 0.04 2.00 1.00 19.0-
23.0
24.0-
26.0
0.040

0.030
4.3-5.0 Mo; 8 × %C min to
0.5 max Nb; 0.5 Cu; 0.005
Pb; 0.035 S
Type 332 N08800 0.01 1.50 1.00 19.0-
23.0

30.0-
35.0
0.045

0.015
0.15-0.60 Ti; 0.15-0.60 Al
904L N08904 0.02 2.00 1.00 19.0-
23.0
23.0-
28.0
0.045

0.035
4.0-5.0 Mo; 1.0-2.0 Cu
Cronifer 1925
hMo
N08925 0.02 1.00 0.50 24.0-
26.0
19.0-
21.0
0.045

0.030
6.0-7.0 Mo; 0.8-1.5 Cu;
0.10-0.20 N
Cronifer 2328 . . . 0.04 0.75 0.75 22.0-
24.0
26.0-
28.0
0.030

0.015
2.5-3.5 Cu; 0.4-0.7 Ti; 2.5-
3.0 Mo
Ferritic stainless steels
18-2 FM (XM-34) S18200 0.08 1.25-
2.50
1.00 17.5-
19.5
. . . 0.040

0.15
min
1.5-2.5 Mo
Type 430 Ti S43036 0.10 1.00 1.00 16.0-
19.5
0.75 0.040

0.030
5 × %C min to 0.75 max Ti
Type 441 S44100 0.03 1.00 1.00 17.5-
19.5
1.00 0.040

0.040
0.3 + 9 × (%C) min to 0.90
max Nb; 0.1-0.5 Ti; 0.03 N
E-Brite 26-1 S44627 0.01 0.40 0.40 25.0-
27.0
0.50 0.020

0.020
0.75-1.5 Mo; 0.05-0.2 Nb;
0.015 N; 0.2 Cu
MONIT (25-4-4) S44635 0.025 1.00 0.75 24.5-
26.0
3.5-4.5 0.040

0.030
3.5-4.5 Mo; 0.2 + 4 (%C +
%N) min to 0.8 max (Ti +
Nb); 0.035 N
Sea-Cure (SC-1) S44660 0.025 1.00 1.00 25.0-
27.0
1.5-3.5 0.040

0.030
2.5-3.5 Mo; 0.2 + 4 (%C +
%N) min to 0.8 max (Ti +
Nb); 0.035 N
AL 29-4C S44735 0.030 1.00 1.00 28.0-
30.0
1.00 0.040

0.030
3.60-4.20 Mo; 0.20-1.00 Ti +
Nb and 6 (%C + %N) min
Ti + Nb; 0.045 N
AL 29-4-2 S44800 0.01 0.30 0.20 28.0-
30.0

2.0-2.5 0.025

0.020
3.5-4.2 Mo; 0.15 Cu; 0.02 N;
0.025 max (%C + %N)
18 SR
(c)
. . . 0.04 0.30 1.00 18.0 . . . . . . . . .
2.0 Al; 0.4 Ti
12 SR
(c)
. . . 0.02 . . . 0.50 12.0 . . . . . . . . .
1.2 Al; 0.3 Ti
406 . . . 0.06 1.00 0.50 12.0-
14.0
0.50 0.040

0.030
2.75-4.25 Al; 0.6 Ti
408 Cb . . . 0.03 0.2-0.5 0.2-
0.5
11.75-
12.25
0.45 0.030

0.020
0.75-1.25 Al; 0.65-0.75 Nb;
0.3-0.5 Ti; 0.03 N
ALFA IV . . . 0.03 0.50 0.60 19.0-
21.0

0.45 0.035

0.005
4.75-5.25 Al; 0.005-0.035
Ce; 0.03 N
Sealmet 1 . . . 0.08 0.5-0.8 0.3-
0.6
28.0-
29.0
0.40 0.030

0.015
0.04 N
Duplex stainless steels
44LN S31200 0.030 2.00 1.00 24.0-
26.0
5.50-
6.50
0.045

0.030
1.20-2.00 Mo; 0.14-0.20 N
DP-3 S31260 0.030 1.00 0.75 24.0-
26.0
5.50-
7.50
0.030

0.030
2.50-3.50 Mo; 0.20-0.80 Cu;

0.10-0.30 N; 0.10-0.50 W
3RE60 S31500 0.030 1.20-
2.00
1.40-
2.00
18.00-
19.00
4.25-
5.25
0.030

0.030
2.50-3.00 Mo
2205 S31803 0.030 2.00 1.00 21.0-
23.0
4.50-
6.50
0.030

0.020
2.50-3.50 Mo; 0.08-0.20 N
2304 S32304 0.030 2.50 1.0 21.5-
24.5
3.0-5.5 0.040

0.040
0.05-0.60 Mo; 0.05-0.60 Cu;
0.05-0.20 N
Uranus 50 S32404 0.04 2.00 1.0 20.5-
22.5

5.5-8.5 0.030

0.010
2.0-3.0 Mo; 1.0-2.0 Cu; 0.20
N
Ferralium 255 S32550 0.04 1.50 1.00 24.0-
27.0
4.50-
6.50
0.04 0.03
2.00-4.00 Mo; 1.50-2.50 Cu;
0.10-0.25 N
7-Mo PLUS S32950 0.03 2.00 0.60 26.0-
29.0
3.50-
5.20
0.035

0.010
1.00-2.50 Mo; 0.15-0.35 N
Martensitic stainless steels
Type 410S S41008 0.08 1.00 1.00 11.5-
13.5
0.60 0.040

0.030
. . .
Type 410 Cb
(XM-30)
S41040 0.15 1.00 1.00 11.5-

13.5
. . . 0.040

0.030
0.05-0.20 Nb
E4 S41050 0.04 1.00 1.00 10.5-
12.5
0.60-1.1

0.045

0.030
0.10 N
CA6NM S41500 0.05 0.5-1.0 0.60 11.5-
14.0
3.5-5.5 0.030

0.030
0.5-1.0 Mo
416 Plus X (XM-
6)
S41610 0.15 1.5-2.5 1.00 12.0-
14.0
. . . 0.060

0.15
min
0.6 Mo
Type 418 (Greek
Ascolloy)

S41800 0.15-
0.20
0.50 0.50 12.0-
14.0
1.8-2.2 0.040

0.030
2.5-3.5 W
TrimRite S42010 0.15-
0.30
1.00 1.00 13.5-
15.0
0.25-
1.00
0.040

0.030
0.40-1.00 Mo
Type 420 F Se S42023 0.3-
0.4
1.25 1.00 12.0-
14.0
. . . 0.060

0.060
0.15 min Se; 0.6 Zr; 0.6 Cu
Lapelloy S42300 0.27-
0.32
0.95-
1.35

0.50 11.0-
12.0
0.50 0.025

0.025
2.5-3.0 Mo; 0.2-0.3 V
Type 440 F S44020 0.95-
1.20
1.25 1.00 16.0-
18.0
0.75 0.040

0.10-
0.35
0.08 N
Type 440 F Se S44023 0.95-
1.20
1.25 1.00 16.0-
18.0
0.75 0.040

0.030
015 min Se; 0.60 Mo
Precipitation-hardening stainless steels
PH 14-4 Mo S14800 0.05 1.00 1.00 13.75-
15.0
7.75-
8.75
0.015

0.010
2.0-3.0 Mo; 0.75-1.50 Al
PH 15-7 Mo (Type
632)
S15700 0.09 1.00 1.00 14.0-
16.0
6.5-7.75

0.040

0.030
2.0-3.0 Mo; 0.75-1.5 Al
AM-350 (Type
633)
S35000 0.07-
0.11
0.5-1.25

0.50 16.0-
17.0
4.0-5.0 0.040

0.030
2.5-3.25 Mo; 0.07-0.13 N
AM-355 (Type
634)
S35500 0.10-
0.15
0.5-1.25

0.50 15.0-
16.0
4.0-5.0 0.040

0.030
2.5-3.25 Mo; 0.07-0.13 N
Custom 450 (XM-
25)
S45000 0.05 1.00 1.00 14.0-
16.0
5.0-7.0 0.030

0.030
1.25-1.75 Cu; 0.5-1.0 Mo; 8
× %C min Nb
Custom 455 (XM-
16)
S45500 0.05 0.50 0.50 11.0-
12.5
7.5-9.5 0.040

0.030 1.5-2.5 Cu; 0.8-1.4 Ti; 0.1-
0.5 Nb; 0.5 Mo

(a)

XM designations in this column are ASTM designations for the listed alloy.
(b)

Single values are maximum values unless otherwise indicated.

(c)

Nominal compositions.
(d)

UNS designation has not been specified. This designation appears in ASTM A 887 and merely indicates the form to be used.

A cooperative study of ASTM and SAE resulted in the Unified Numbering System (UNS) for designation and
identification of metals and alloys in commercial use in the United States. In UNS listings, stainless steels are identified
by the letter S, followed by five digits. A few stainless alloys are classified as nickel alloys in the UNS system
(identification letter N) because of their high nickel and low iron (less than 50%) contents.
Use of UNS numbers and AISI standard-type numbers ensures that a consumer can obtain suitable material time after
time even from different producers or suppliers. Nevertheless, some variation in fabrication and service characteristics
can be expected, even with material obtained from a single producer.
Wrought Stainless Steels
Revised by S.D. Washko and G. Aggen, Allegheny Ludlum Steel, Division of Allegheny Ludlum Corporation

Factors in Selection
The first and most important step toward successful use of a stainless steel is selection of a type that is appropriate for the
application. There are a large number of standard types that differ from one another in composition, corrosion resistance,
physical properties, and mechanical properties; selection of the optimum type for a specific application is the key to
satisfactory performance at minimum total cost.
The characteristics and properties of individual types discussed in this article and elsewhere in this Volume provide some
of the information useful in steel selection. For a more detailed discussion, the reader is referred to Design Guidelines for
the Selection and Use of Stainless Steel, published by the Committee of Stainless Steel Producers and available through
AISI.
A checklist of characteristics to be considered in selecting the proper type of stainless steel for a specific application
includes:
• Corrosion resistance
• Resistance to oxidation and sulfidation

• Strength and ductility at ambient and service temperatures
• Suitability for intended fabrication techniques
• Suitability for intended cleaning procedures
• Stability of properties in service
• Toughness
• Resistance to abrasion and erosion
• Resistance to galling and seizing
• Surface finish and/or reflectivity
• Magnetic properties
• Thermal conductivity
• Electrical resistivity
• Sharpness (retention of cutting edge)
• Rigidity
Corrosion resistance is frequently the most important characteristic of a stainless steel, but often is also the most
difficult to assess for a specific application. General corrosion resistance to pure chemical solutions is comparatively easy
to determine, but actual environments are usually much more complex. Tables 4 and 5 show resistance of standard types
to various common media.
Table 4 Resistance of standard types of stainless steel to various classes of environments

Atmospheric
Chemical
Type Mild atmospheric

and
fresh water
Industrial

Marine

Salt

water

Mild

Oxidizing

Reducing

Austenitic stainless steels
201 x x x . . . x x
. . .
202 x x x . . . x x
. . .
205 x x x . . . x x
. . .
301 x x x . . . x x
. . .
302 x x x . . . x x
. . .
302B x x x . . . x x
. . .
303 x x . . . . . . x . . .
. . .
303Se x x . . . . . . x . . .
. . .
304 x x x . . . x x
. . .
304H x x x . . . x x
. . .
304L x x x . . . x x

. . .
304N x x x . . . x x
. . .
S30430 x x x . . . x x
. . .
305 x x x . . . x x
. . .
308 x x x . . . x x
. . .
309 x x x . . . x x
. . .
309S x x x . . . x x
. . .
310 x x x . . . x x
. . .
310S x x x . . . x x
. . .
314 x x x . . . x x
. . .
316 x x x x x x
x
316F x x x x x x
x
316H x x x x x x
x
316L x x x x x x
x
316N x x x x x x
x
317 x x x x x x

x
317L x x x x x x
x
321 x x x . . . x x
. . .
321H x x x . . . x x
. . .
329 x x x x x x
x
330 x x x x x x
x
347 x x x . . . x x
. . .
347H x x x . . . x x
. . .
348 x x x . . . x x
. . .
348H x x x . . . x x
. . .
384 x x x . . . x x
. . .
Ferritic stainless steels
405 x . . . . . . . . . x . . .
. . .
409 x . . . . . . . . . x . . .
. . .
429 x x . . . . . . x x
. . .
430 x x . . . . . . x x
. . .

430F x x . . . . . . x . . .
. . .
430FSe x x . . . . . . x . . .
. . .
434 x x x . . . x x
. . .
436 x x x . . . x x
. . .
442 x x . . . . . . x x
. . .
446 x x x . . . x x
. . .
Martensitic stainless steels
403 x . . . . . . . . . x . . .
. . .
410 x . . . . . . . . . x . . .
. . .
414 x . . . . . . . . . x . . .
. . .
416 x . . . . . . . . . . . . . . .
. . .
416Se x . . . . . . . . . . . . . . .
. . .
420 x . . . . . . . . . . . . . . .
. . .
420F x . . . . . . . . . . . . . . .
. . .
422 x . . . . . . . . . . . . . . .
. . .
431 x x x . . . x . . .

. . .
440A x . . . . . . . . . x . . .
. . .
440B x . . . . . . . . . . . . . . .
. . .
440C x . . . . . . . . . . . . . . .
. . .
501 . . . . . . . . . . . . . . . . . .
. . .
502 . . . . . . . . . . . . . . . . . .
. . .
503 . . . . . . . . . . . . . . . . . .
. . .
504 . . . . . . . . . . . . . . . . . .
. . .
Precipitation-hardening stainless steels
PH 13-8 Mo

x x . . . . . . x x
. . .
15-5 PH x x x . . . x x
. . .
17-4 PH x x x . . . x x
. . .