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Spectro >> Useful Info >> Stainless Steel Grades

Hardness Conversion Chart

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Stainless Steel Family AISI Designation European Standard Designation
    Name Number
Austenitic 201 X12CrMnNiN17-7-5 1.4372
  202 X12CrMnNiN18-9-5 1.4373
  301 X10CrNi18-8 1.4310
  301L X2CrNiN18-7 1.4318
  304 X5CrNi18-10 1.4301
  304L X2CrNi18-9 1.4307
  305 X4CrNi18-12 1.4303
  316 X5CrNiMo17-12-2 1.4401
  316L X2CrNiMo17-12-2 1.4404
  321 X6CrNiTi18-10 1.4541
       
Martensitic 410 X12Cr13 1.4006
  420 X30Cr13 1.4028
       
Ferritic 430 X6Cr17 1.4016
  409 X2CrTi12 1.4512
  434 X6CrMo17-1 1.4113
  441 X2CrTiNb18 1.4509
  436 X6CrMoNb17-1 1.4526

N.B.:AISI stands for American Iron and Steel Institute

Composition of Stainless & Heat Resistant Steels (In % by Mass; Classification as per SAE & AISI)
SAE No. AISI No. C (Max) Si (Max) Mn (Max) P (Max) S (Max) Cr Mo Ni Others
30201 201 0.15 1.00 5.50/7.50 0.06 0.03 16.00/18.00 ------ 3.50/5.50 N 0.25 Max
30202 202 0.15 1.00 7.50/10.00 0.06 0.03 17.00/19.00 ------ 4.00/6.00 N 0.25 Max
30301 301 0.15 1.00 2.00 0.06 0.03 16.00/18.00 ------ 6.00/8.00 ------------
30302 302 0.15 1.00 2.00 0.045 0.03 17.00/19.00 ------ 8.00/10.00 ------------
30302B 302B 0.15 2.00/3.00 2.00 0.045 0.03 17.00/19.00 0.60 Max 8.00/10.00 ------------
30303 303 0.15 1.00 2.00 0.045 0.15 Min 17.00/19.00 ------ 8.00/10.00 Zr 0.60 Max
30303Se 303Se 0.15 1.00 2.00 0.20 0.06 17.00/19.00 ------ 8.00/10.00 Se 0.15 Min
30304 304 0.08 1.00 2.00 0.20 0.03 18.00/20.00 ------ 8.00/10.50 ------------
30304L 304L 0.03 1.00 2.00 0.045 0.03 18.00/20.00 ------ 8.00/12.00 ------------
30305 305 0.12 1.00 2.00 0.045 0.03 17.00/19.00 ------ 10.50/13.00 ------------
30308 308 0.08 1.00 2.00 0.045 0.03 19.00/21.00 ------ 10.00/12.00 ------------
30309 309 0.20 1.00 2.00 0.045 0.03 22.00/24.00 ------ 12.00/15.00 ------------
30309S 309S 0.08 1.00 2.00 0.045 0.03 22.00/24.00 ------ 12.00/15.00 ------------
30310 310 0.25 1.50 2.00 0.045 0.03 24.00/26.00 ------ 19.00/22.00 ------------
30310S 310S 0.08 1.50 2.00 0.045 0.03 24.00/26.00 ------ 19.00/22.00 ------------
30314 314 0.25 1.50/3.00 2.00 0.045 0.03 23.00/26.00 ------ 19.00/22.00 ------------
30316 316 0.08 1.00 2.00 0.045 0.03 16.00/18.00 2.00/3.00 10.00/14.00 ------------
30316L 316L 0.03 1.00 2.00 0.045 0.03 16.00/18.00 2.00/3.00 10.00/14.00 ------------
30317 317 0.08 1.00 2.00 0.045 0.03 18.00/20.00 3.00/4.00 11.00/15.00 ------------
30321 321 0.15 1.00 2.00 0.045 0.03 17.00/19.00 ------ 9.00/12.00 Ti 5×C Min
30330 ----- 0.15 1.50 2.00 0.045 0.04 14.00/17.00 ------ 33.00/37.00 ------------
30347 347 0.08 1.00 2.00 0.045 0.03 17.00/19.00 ------ 9.00/13.00 Nb:Ta 10×C Min
30348 348 0.08 1.00 2.00 0.045 0.03 17.00/19.00 ------ 9.00/13.00 Nb:Ta 10×C MinTa : 0.10 Max
Co : 0.20 Max
30384 384 0.08 1.00 2.00 0.045 0.03 15.00/17.00 ------ 17.00/19.00 -------------
30385 385 0.08 1.00 2.00 0.045 0.03 11.50/13.50 ------ 14.00/16.00 -------------
                     
51403 403 0.15 0.50 1.00 0.04 0.03 11.50/13.00 ------ --------- -------------
51405 405 0.08 1.00 1.00 0.04 0.03 11.50/14.50 ------ --------- Al 0.10/0.30
51409 ------ 0.08 1.00 1.00 0.045 0.045 10.50/11.75 ------ 0.50 Max Ti 6C/0.75
51410 410 0.15 1.00 1.00 0.04 0.03 11.50/13.50 ------ --------- ------------
51414 414 0.15 1.00 1.00 0.04 0.03 11.50/13.50 ------ 1.25/2.50 ------------
51416 ------ 0.15 1.00 1.25 0.06 0.15 Min 12.00/14.00 0.60 Max ---------- ------------
------- 416 0.15 1.00 1.25 0.06 0.15 Min 12.00/14.00 0.60 Max ---------- -------------
51416Se 416Se 0.15 1.00 1.25 0.06 0.06 12.00/14.00 ------ ---------- Se 0.15 Min
51420 420 Over 0.15 1.00 1.00 0.04 0.03 12.00/14.00 ------ -------- ------
51420F 420F Over 0.15 1.00 1.25 0.06 0.15 Min 12.00/14.00 0.60 Max ---------- -----------
51420FSe ------ 0.30 / 0.40 1.00 1.25 0.06 0.06 12.00/14.00 ------ ---------- Se 0.15 Min
51429 429 0.12 1.00 1.00 0.03 0.04 14.00/16.00 ------ ----------  
51430 430 0.12 1.00 1.00 0.04 0.03 16.00/18.00 ------ ----------  
51430F 430F 0.12 1.00 1.25 0.06 0.15 Min 16.00/18.00 0.60 Max ----------  
51430FSe 430FSe 0.12 1.00 1.25 0.06 0.06 16.00/18.00 ----- ---------- Se 0.15 Min
51431 431 0.20 1.00 1.00 0.04 0.03 15.00/17.00 -------- 1.25/2.50 -------
51434 434 0.12 1.00 1.00 0.04 0.03 16.00/18.00 0.75/1.25 -------- ---------
51436 436 0.12 1.00 1.00 0.04 0.03 16.00/18.00 0.75/1.25 --------- ---------
51440A 440A 0.60 / 0.75 1.00 1.00 0.04 0.03 16.00/18.00 0.75 Max -------- ---------
51440B 440B 0.75 / 0.95 1.00 1.00 0.04 0.03 16.00/18.00 0.75 Max ------- -------
51440C 440C 0.95 / 1.20 1.00 1.00 0.04 0.03 16.00/18.00 0.75 Max -------- -------
51440F ------- 0.95 / 1.20 1.00 1.25 0.04 0.15 Min 16.00/18.00 0.75 Max ------- ------
51440FSe ------- 0.95 / 1.20 1.00 1.25 0.04 0.06 16.00/18.00 ------- -------- Se 0.15 Min
51442 ------- 0.20 1.00 1.00 0.04 0.035 18.00/23.00 -------- -------- ---------
---------   0.20 1.00 1.00 0.04 0.03 18.00/23.00 ------- --------- -------
51446   0.20 1.00 1.50 0.04 0.03 23.00/27.00 ------- --------- N 0.25 Max
---------   0.20 1.00 1.50 0.04 0.03 23.00/27.00   -------- N 0.25 Max
51501   Over 0.10 1.00 1.00 0.04 0.03 4.00/6.00 0.40/0.65 -------- -------
51502   0.10 1.00 1.00 0.04 0.03 4.00/6.00 0.40/0.65 ---------- -------

N.B.: (1) ‘AISI’ stands for American Iron and Steel Institute.
(2) ‘SAE’ stands for Society of Automotive Engineers.

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