Stainless Steel Composition

300 Series Austenitic Stainless Steel Grades

Stainless steel grades Chemical composition % by mass max
UNS No AISI No. C Si Mn P S Cr Mo Ni Others
S30100 301 0.15 1.00 2.00 0.045 0.030 16.0/18.0 6.0/8.0 N 0.10
S30103 301L 0.03 1.00 2.00 0.045 0.030 16.0/18.0 6.0/8.0 N 0.20
S30153 301LN 0.03 1.00 2.00 0.045 0.030 16.0/18.0 6.0/8.0 N 0.07/0.20
S30200 302 0.15 0.75 2.00 0.045 0.030 17.0/19.0 8.0/10.0 N 0.10
S30215 302B 0.15 2.00/ 3.00 2.00 0.045 0.030 17.0/19.0 8.0/10.0
S30300 303 0.15 1.00 2.00 0.20 0.15 min 17.0/19.0 8.0/10.0
S30310 XM-5 (303Plus x) 0.15 1.00 2.50/4.50 0.20 0.25 min 17.00/19.00 7.00/9.00
S30323 303Se 0.15 1.00 2.00 0.20 0.060 17.0/19.0 8.0/10.0 Se 0.15 min
S30330 303Cu 0.15 1.00 2.00 0.15 0.10 min 17.0/19.0 6.0/10.0 Cu 2.5/4.0; Se 0.10
S30400 304 0.07 0.75 2.00 0.045 0.030 17.5/19.5 8.0/10.5 N 0.10
S30400 A276 for bar 304 0.08 1.00 2.00 0.045 0.030 18.0/20.0 8.0/11.0
S30403 304L 0.030 0.75 2.00 0.045 0.030 17.5/19.5 8.0/12.0 N 0.10
S30403 A276 for bar 304L 0.030 1.00 2.00 0.045 0.030 18.0/20.0 8.0/12.0
S30430 302HQ 0.03 1.00 2.00 0.045 0.030 17.0/19.0 8.0/10.0 Cu 3.0/4.0
S30452 XM-21 (304HN) 0.08 1.00 2.00 0.045 0.030 18.0/20.0 8.00/10.00 N 0.16/0.30
S30453 304LN 0.030 0.75 2.00 0.045 0.030 18.0/20.0 8.0/12.0 N 0.10/0.16
S30454 0.03 1.00 2.00 0.045 0.030 18.0/20.0 8.0/11.0 N 0.16/0.30
S30500 305 0.12 0.75 2.00 0.045 0.030 17.0/19.0 10.5/13.0
S30800 308 0.08 1.00 2.00 0.045 0.030 19.0/21.0 10.0/12.0
S31600 316 0.08 0.75 2.00 0.045 0.030 16.0/18.0 2.00/3.00 10.0/14.0 N 0.10
S31603 316L 0.030 0.75 2.00 0.045 0.030 16.0/18.0 2.00/3.00 10.0/14.0 N 0.10
S31635 316Ti 0.08 0.75 2.00 0.045 0.030 16.0/18.0 2.00/3.00 10.0/14.0 Ti 5x (C+N) / 0.70 N 0.10
S31640 316Cb 0.08 0.75 2.00 0.045 0.030 16.0/18.0 2.00/3.00 10.0/14.0 Nb 10x C / 1.10 N 0.10
S31653 316LN 0.030 0.75 2.00 0.045 0.030 16.0/18.0 2.00/3.00 10.0/14.0 N 0.10/0.16
S31700 317 0.08 0.75 2.00 0.045 0.030 18.0/20.0 3.0/4.0 11.0/15.0 N 0.10
S31703 317L 0.030 0.75 2.00 0.045 0.030 18.0/20.0 3.00/4.00 11.0/15.0 N 0.10
S31725 317LM 0.030 0.75 2.00 0.045 0.030 18.0/20.0 4.0/5.0 13.5/17.5 N 0.20
S31726 317LMN 0.030 0.75 2.00 0.045 0.030 17.0/20.0 4.0/5.0 13.5/17.5 N 0.10/0.20
S31753 317LN 0.030 0.75 2.00 0.045 0.030 18.0/20.0 3.0/4.0 11.0/15.0 N 0.10/0.22
S32100 321 0.08 0.75 2.00 0.045 0.030 17.0/19.0 9.0/12.0 Ti 5 x C min/0.70 N 0.10
S34700 347 0.08 0.75 2.00 0.045 0.030 17.0/19.0 9.0/13.0 Nb+Ta 10 x C min/1.0
S34720 347F 0.08 1.00 2.00 0.040 0.18/0.35 17.00/19.00 0.75 9.00/12.00 Nb 10xC / 1.10;
Cu 0.75; Ta 0.05
S34723 347FSe 0.08 1.00 2.00 0.11/0.17 0.030 17.00/19.00 0.75 9.00/12.00 Nb 10xC / 1.10; Cu 0.75;
Se 0.15/0.35; Ta 0.05
S34800 348 0.08 0.75 2.00 0.045 0.030 17.0/19.0 9.00/13.0 Nb+Ta 10 x C / 1.00;
Ta:0.10 max; Co 0.20
S38400 384 0.04 1.00 2.00 0.045 0.030 15.0/17.0 17.0/19.0

Duplex Grades

Stainless steel grades Chemical composition % by mass max
UNS No AISI No. C Si Mn P S Cr Mo Ni Others
S31803 2205 0.030 1.00 2.00 0.030 0.020 21.0/23.0 2.5/3.5 4.5/6.5 N 0.08/0.20
S32304 2304 0.030 1.00 2.50 0.040 0.030 21.5/24.5 0.05/0.60 3.0/5.5 N 0.05/0.20; Cu 0.05/0.60
S32750 2507 0.030 0.80 1.20 0.035 0.020 24.0/26.0 3.0/5.0 6.0/8.0 N 0.24/0.32; Cu 0.50

Super Austenitic Grades

Stainless steel grades Chemical composition % by
UNS No AISI No. C Si Mn P S Cr Mo Ni Others
N08904 904L 0.020 1.00 2.00 0.045 0.035 19.0/23.0 4.0/5.0 23.0/28.0 Cu 1.0/2.0 N 0.10

Ferritic Stainless Steel Grades

Stainless steel grades Chemical composition % by mass max
UNS No AISI No. C Si Mn P S Cr Mo Ni Others
S40300 403 0.15 0.50 1.00 0.040 0.030 11.5/13.0
S40500 405 0.08 1.00 1.00 0.040 0.030 11.5/14.5 Al 0.10./0.30
S40800 0.08 1.00 1.00 0.045 0.045 11.5/13.0 0.50 Ti 12xC/1.10
S40900 409 This well known grade is replaced by S40910 S40920 and S40930
S41008 410S 0.08 1.00 1.00 0.040 0.030 11.5/13.5 0.60
S43000 430 0.12 1.00 1.00 0.040 0.030 16.0/18.0
S43020 430F 0.12 1.00 1.25 0.060 0.15 min 16.0/18.0 0.75
S43023 430FSe 0.12 1.00 1.25 0.060 0.060 16.0/18.0 Se 0.15
S43036 430Ti 0.10 1.00 1.00 0.040 0.030 16.0/19.5 0.75 Ti 5xC/0.75
S43400 434 0.12 1.00 1.00 0.040 0.030 16.0/18.0 0.75/1.25
S43600 436 0.12 1.00 1.00 0.040 0.030 16.0/18.0 0.75/1.25 Nb+Ta 5xC/0.80
S44200 442 0.20 1.00 1.00 0.040 0.035 18.0/23.0 0.60

Heat Resisting Grades

Stainless steel grades Chemical composition % by mass max
UNS No AISI No. C Si Mn P S Cr Mo Ni Others
S30409 304H 0.04/0.10 0.75 2.00 0.045 0.030 18.0/20.0 8.0/10.5
S30415 153MA 0.04/0.06 1.00/2.00 0.80 0.045 0.030 18.0/19.0 9.0/10.0 N 0.12/0.18;
Ce 0.03/0.08
S30451 304N 0.08 0.75 2.00 0.045 0.030 18.0/20.0 8.0/10.5 N 0.10/0.16
S30452 304HN (XM-21) 0.08 0.75 2.00 0.045 0.030 18.0/20.0 8.0/10.5 N 0.16/0.30
S30615 RA85H 0.16/0.24 3.2/4.0 2.00 0.030 0.030 17.0/19.5 13.5/16.0 Al 0.80/1.50
S30815 253MA 0.05/0.10 1.40/2.00 0.80 0.040 0.030 20.0/22.0 10.0/12.0 N 0.14/0.20;
Ce 0.03/0.08
S30900 309 0.20 1.00 2.00 0.045 0.030 22.0/24.0 12.0/15.0
S30908 309S 0.08 0.75 2.00 0.045 0.030 22.0/24.0 12.0/15.0
S30909 309H 0.04/0.10 0.75 2.00 0.045 0.030 22.0/24.0 12.0/15.0
S30940 309Cb 0.08 0.75 2.00 0.045 0.030 22.0/24.0 12.0/16.0 Nb 10xC / 1.10
S30941 309HCb 0.04/0.10 0.75 2.00 0.045 0.030 22.0/24.0 12.0/16.0 Nb 10xC / 1.10
S31000 310 0.25 1.50 2.00 0.045 0.030 24.0/26.0 19.0/22.0
S31008 310S 0.08 1.50 2.00 0.045 0.030 24.0/26.0 19.0/22.0
S31009 310H 0.04/0.10 0.75 2.00 0.045 0.030 24.0/26.0 19.0/22.0
S31040 310Cb 0.08 1.50 2.00 0.045 0.030 24.0/26.0 19.0/22.0 Nb 10xC / 1.10
S31041 310HCb 0.04/0.10 0.75 2.00 0.045 0.030 24.0/26.0 19.0/22.0 Nb 10xC / 1.10
S31400 314 0.25 1.50/3.00 2.00 0.045 0.030 23.0/26.0 19.0/22.0
S31609 316H 0.04/0.10 0.75 2.00 0.045 0.030 16.0/18.0 2.00/3.00 10.0/14.0
S31651 316N 0.08 0.75 2.00 0.045 0.030 16.0/18.0 2.00/3.00 10.0/14.0 N 0.10/0.16
S32109 321H 0.04/0.10 0.75 2.00 0.045 0.030 17.0/19.0 9.0/12.0 Ti 4x(C+N) / 0.70
S33228 0.04/0.08 0.30 1.00 0.020 0.015 26.0/28.0 31.0/33.0 Al 0.025;
Ce 0.05/0.10;
Nb 0.6/1.0
S33400 334 0.08 1.00 1.00 0.030 0.015 18.0/22.0 19.0/21.0 Al 0.15/0.60;
Ti 0.15/0.60
S34709 347H 0.04/0.10 0.75 2.00 0.045 0.030 17.0/19.0 9.0/13.0 Nb 8xC /1.00
S34800 348 0.08 0.75 2.00 0.045 0.030 17.0/19.0 9.0/13.0 Nb+Ta 10xC / 1.00;
Ta 0.10;
Co 0.20
S34809 348H 0.04/0.10 0.75 2.00 0.045 0.030 17.0/19.0 9.0/13.0 Nb+Ta 10xC /1.00;
Ta 0.10;
Co 0.20
S35045 0.06/0.10 1.00 1.50 0.045 0.015 25.0/29.0 32.0/37.0 Al 0.15/0.60;
Ti 0.15/0.60
S35315 353MA 0.04/0.08 1.20/2.00 2.00 0.040 0.030 24.0/26.0 34.0/36.0 N 0.12/0.18;
Ce 0.03/0.10
S41041 0.13/0.18 0.50 0.40/0.60 0.030 0.030 11.50/13.00 0.20 0.50 Al 0.05; Nb 0.15
S41425 0.05 0.50 0.50/1.00 0.020 0.005 12.0/15.0 1.50/2.00 4.0/7.0 N 0.06/0.12;
Cu 0.30
S41800 Greek Ascoloy (615) 0.15/0.20 0.50 0.50 0.040 0.030 12.00/14.00 0.50 1.80/2.20 W 2.50/3.50
S42200 616 0.20/0.25 0.50 0.50/1.00 0.025 0.025 11.0/12.5 0.90/1.25 0.50/1.00 V 0.20/0.30;
W 0.90/1.25
S42300 Lapelloy (619) 0.27/0.32 0.50 0.95/1.35 0.025 0.025 11.00/12.00 2.50/3.00 0.50 V 0.20/0.30
S44300 MT443 0.20 1.00 1.00 0.040 0.030 18.0/23.0 0.50 Cu 0.90/1.25
S44600 446 0.20 1.00 1.50 0.040 0.030 23.0/27.0 0.75 N 0.25
S64152 XM-32 0.08/0.15 0.35 0.50/0.90 0.025 0.025 11.00/12.50 1.50/2.00 2.00/3.00 N 0.01/0.05;
V 0.25/0.40
N08800 800 (332) 0.10 1.00 1.50 0.045 0.015 19.0/23.0 30.0/35.0 Fe 39.5 min;
Al 0.15/0.60;
Ti 0.15/0.60
N08810 800H 0.05/0.10 1.00 1.50 0.045 0.015 19.0/23.0 30.0/35.0 30.0/35.0 Cu 0.75;
Fe 39.5 min;
Al 0.15/0.60;
Ti 0.15/0.60

Remarks

  • These chemical composition are provided based on ASTM A240 specification, which is for plate, sheet, and strip.
  • Other ASTM standard may have a little different composition, such as ASTM A269, which is for welded or seamless tubing, 304 stainless steel composition is not full the same with above chart table.
  • It is slight difference with EN standard equivalent grades too, checking 304 and 1.4301.

Stainless Steel Composition Elements

There are various chemical elements playing a important role in stainless steel, different chemical composition affect different result and properties, and list some elements as following:

Carbon (C)

  • Carbon content increasing, yield point and tensile strength increasing, but ductility and impact resistance down
  • When carbon content exceed 0.23%,welding performance of steel will be not good
  • Carbon content is generally not more than 0.20%
  • High carbon content can also reduce the corrosion resistance of the steel, easy to rust
  • In addition, carbon can increase cold brittleness and aging of steel, like TP304 and TP304L,304L is low carbon 304

Silicon (Si)

  • In the process of making steel, silicon as a reducing agent and oxidizing agent, so containing 0.15 – 0.30% of silicon
  • If silicon content more than 0.50-0.60%,silicon significantly improve elastic limit, yield point and tensile strength, so it is widely used in spring steel
  • Adding 1.0 – 1.2% silicon in the quenched and tempered steel, strength can be increased by 15-20%
  • The combination of Silicon, Molybdenum, Tungsten, Chromium has the effect of improving the corrosion resistance and oxidation resistance
  • Low carbon steel containing silicon 1 – 4%, with a high permeability, used in electrical industry silicon steel sheet
  • Silicon content increasing, reducing the welding of steel

Manganese (Mn)

  • in the process of making steel, manganese is a good agent and desulfurization agent, manganese content in common steel of 0.30 – 0.50%
  • Carbon steel, adding more than 0.70% manganese, not only enough toughness, and have higher strength and hardness, improve steel quenching and performance of thermal processing
  • Manganese content increased, weakened the corrosion resistance of steel, reduce the welding performance. Manganese can improve the strength of steel, increase the manganese content to improve the low temperature impact toughness is good

Phosphorus (P)

in general, phosphorus is a harmful element in steel, increasing the cold brittleness of steel, so that the welding performance deterioration, reduce ductility, so that the cold bending performance. It usually requires the phosphorus content in steel is less than 0.045%, lower requirements for high quality steel.

Sulfur (S)

  • Sulfur in the normal circumstances is also harmful elements. generating heat, reduce ductility and toughness
  • Sulfur on the welding performance is also bad, reducing corrosion resistance. So the sulfur content is less than 0.055%
  • Requirements of high quality steel are less than 0.040%. The addition of 0.08-0.20% to the steel can improve the machinability, often referred to as free-cutting steel

Chromium (Cr)

  • In the structural steel and tool steel, chromium can significantly improve the strength, hardness and wear resistance, but at the same time to reduce ductility and toughness
  • Chromium can improve oxidation resistance and corrosion resistance, so it is an important alloying element of stainless steel

Nickel (Ni)

  • Nickel element can improve the strength of steel, and maintain a good ductility and toughness. Nickel has a higher corrosion resistance to acid and alkali, and has the ability of anti rust and heat resistance at high temperature
  • Improve toughness, so that the steel has a high strength, but also to maintain a good ductility and toughness
  • Nickel can improve the corrosion resistance and low temperature impact toughness
  • Nickel based alloys have a higher thermal performance

Molybdenum (Mo)

  • Molybdenum can make the grain refinement, improve the quenching and thermal properties
  • Under high temperature to maintain sufficient strength and creep resistance (long-term at high temperature under stress, deformation, said creep)
  • Mechanical properties can be improved with the addition of molybdenum in structural steel

Titanium(Ti)

  • Titanium steel is strong deoxidizing agent, making the internal structure of the steel dense, fine grain size, and reduce the aging sensitivity and cold brittleness
  • Improve the welding performance
  • Adding proper titanium to Austenitic stainless steels, avoiding Intergranular corrosion

Copper (Cu)

  • Copper can improve the strength and toughness, especially to atmospheric corrosion performance
  • Disadvantage is prone to cracking during thermal processing, the copper content more than 0.5% ductility significantly reduced
  • When the copper content is less than 0.50%, no effect on the welding property

Nitrogen (N)

Nitrogen can improve the strength of steel, low temperature toughness and welding.