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, ...) Titanium or titanium alloys, with a hardness UNS R50250 (Grade 1), EN Ti 99.6, DIN 3.7035, BS TA.2, UNE Ti-Po2, AFNOR T-40, GOST BT1-00​, S1.1 1.94 of <200 HB AISI R50250, 3.7025, T35, 2TA1, R50400, 3.7035, 2TA2, Titanium alloys, with a hardness of UNS R56404 (Grade 29), EN Ti2Cu, DIN 3.7124, BS TA.21, UNE Ti-P11, AFNOR T-U2 , AISI TA6V, Ti-6Al- S1 Titanium or titanium alloys S1.2 1.72 200 – 280 HB 4V, Ti 10.2.3, Ti5553 UNS R54250 (Grade 38), EN TiAl6V4, DIN 3.7165, ČSN TiAl6VELI, BS TA. 13, UNE Ti-P63, AFNOR T-A6V, S1.3 Titanium alloys, a hardness of 280 – 360 HB 1.44 GOST BT6​, AISI TA6V, Ti-6Al-4V, Ti 10.2.3, Ti5553 High-temperature Fe-based alloys with a UNS N08801 (Incoloy 801), EN X8 NiCrAlTi31-21, DIN 1.4959, BS NA 15, AFNOR Z8NC33-21​, AISI A-286, S2.1 1.33 hardness of <200 HB Discaloy, Haynes 556, Iconel 909, Greek Ascolloy High-temperature S2 Fe-based high-temperature alloys 9 alloys (superalloys with high High-temperature Fe-based alloys with a UNS N19907, EN X6NiCrTiMoVB25-15-2, DIN 1.4980, SS 2570, BS HR52, AFNOR Z6NCTDV25.15B, S temperature stength S2.2 1.17 hardness of 200 – 280 HB GOST 36НХТЮ​, AISI A-286, Discaloy, Haynes 556, Iconel 909, Greek Ascolloy and corrosion resistant surpassing that of stainless steel) UNS A09706 (Inconel 706), EN NiCr25FeAl, DIN 2.4856, BS HR 6, ČSN Inconel 625, UNE F.3313, High-temperature Ni-based alloys with a S3.1 1.00 GB 1Cr16Ni35, AFNOR NC22FeDNB, GOST XH38BT​, AISI Inconel 718, 706 Waspalloy, Udimet 720, hardness of <280 HB Inconel 625 S3 Ni-based high-temperature alloys High-temperature Ni-based alloys with a UNS N07001, EN NiCr20Co13Mo4Ti3Al, DIN 2.4654, BS HR 2, ČSN Waspaloy, AFNOR NCKD 20ATV, S3.2 0.83 hardness of 280 – 360 HB GOST ХН80ТБЮ​, AISI Inconel 718, 706 Waspalloy, Udimet 720, Inconel 625 High-temperature Co-based alloys with a UNS R30016 (Stellite 6b), EN CoCr20W15Ni, DIN 2.4964, AFNOR KC 20 WN, GOST ЛК52​, AISI Haynes S4.1 0.78 hardness of <240 HB 25, Stellite 21, 31 S4 Co-based high-temperature alloys High-temperature Co-based alloys with a UNS R30016 (Stellite 6b), EN CoCr20W15Ni, DIN 2.4964, AFNOR KC 20 WN, GOST ЛК52​​, AISI Haynes S4.2 0.67 hardness of 240 – 320 HB 25, Stellite 21, 31 WORKPIECE MATERIAL GROUP (WMG) 697