
694 ISO group Subgroup WMG (Work Material Group) kvG Examples of material (AISI, EN, DIN, ČSN, GB, SS, STN, BS, UNE, AFNOR, ASTM, GOST, UNS, UNI, ...) Stainless steel, ferritic with a hardness AISI S429, EN X7Cr14, DIN 1.4001, SS 2326, BS 434S17, UNE F.3401, AFNOR Z8C12, GOST 08Ch13, M1.1 1.22 of < 160 HB UNI X6CrTi12 Ferritic stainless steel M1 (straight chromium non-hardenable alloys) Stainless steel, ferritic with a hardness of AISI 446, EN X10CrAl24, DIN 1.4762, SS 2322, ČSN 17113, BS 430S17, UNE F.3154, GB 10Cr17, M1.2 1.03 160 – 220 HB AFNOR Z10CAS24, GOST 12Ch17, UNI X16Cr26 Stainless steel, martensitic with a hardness AISI 430F, EN X14CrMoS17, DIN 1.4104, SS 2383, ČSN 17140, BS 410S21, UNE F.3117, AFNOR Z10CF17, M2.1 1.08 of < 200 HB UNI X10CrS17 Martensitic stainless steel Stainless steel, martensitic with a hardness AISI 440C, EN X105CrMo17, DIN 1.4125, SS 2385, ČSN 17023, BS 425C11, UNE F.3402, GB 102Cr17Mo, M2 M2.2 0.89 (straight chromium hardenable alloys) of 200 – 280 HB AFNOR Z100CD17, GOST 95Ch18, UNI GX6CrNi 13 04 Stainless steel, martensitic with a hardness AISI 420, EN X45Cr13, DIN 1.4034, ČSN 17029, BS 425C11, UNE F.3405, AFNOR Z44C14, M2.3 0.75 Stainless steel of 280 – 380 HB GOST 20X17H12, UNI X30Cr13 9 (corrosion resistant M steels with ≥ 11 % chromium content) Stainless steel, austenitic with a hardness AISI 304, EN X5CrNi18-12, DIN 1.4303, SS 2352, ČSN 17249, BS 305S17, UNE F.3513, GB 10Cr18Ni12, M3.1 1.00 of < 200 HB AFNOR Z8CN18.12, UNI X7CrNi18 10 Austenitic stainless steel Stainless steel, austenitic with a hardness AISI 309, EN X15CrNiSi20-12, DIN 1.4828, ČSN 17251, BS 309S24, UNE F.3312, GB 1Cr23Ni13, M3 (chromium-nickel and chromium-nickel- M3.2 0.86 of 200 – 260 HB AFNOR Z15CNS20.12, GOST 20Ch20N14S2, UNI 16CrNi23 14 manganese alloys) Stainless steel, austenitic with a hardness AISI 5848, EN X45CrNiW18-9, DIN 1.4873, BS 331S40, UNE F.3211, AFNOR Z35CNWS14-4, M3.3 0.77 of 260 – 300 HB UNI X45CrNiW 18 9 Stainless steel, austenitic-ferritic or super- AISI 329, EN X1-NiCrMoCU25-20-5, DIN 1.4539, SS 2562, ČSN 17265, BS 318S13, UNE F.3552, Super-austenitic, Duplex or Precipitation M4.1 0.75 austenitic with a hardness of < 300 HB GB 022Cr25NiMo2N, AFNOR Z1NCDU25.20 Hardening stainless steel M4 (austenitic alloys with > 20 % Ni, austenitic-ferritic microstructure or precipitation hardened) Stainless steel, precipitation hardening AISI 631 (17-7PH), EN X7CrNiAL17-7, DIN 1.4568, SS 2388, ČSN 17465 , BS 301S13, UNE F.3217, M4.2 0.64 austenitic with a hardness of 300 – 380 HB GB 07Cr17Ni7Al, AFNOR 29CNA17-07, GOST 09Ch17N7Ju1, UNI X53CrMnNiN21 9 WORKPIECE MATERIAL GROUP (WMG)