693 WORKPIECE MATERIAL GROUP (WMG) 9 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, ...) P1.1 Free machining sulfurized carbon steel with ahardness of < 220 HB1.33AISI 1108, EN 15S22, DIN 1.0723, SS 1922, ČSN 11120, BS 210A15, UNE F.210F, GB Y15, AFNOR 10F1,GOST A30, UNI CF10S20​ P1 Free machining steel(carbon steels with increased machinability)P1.2Free machining sulfurized and phosphorizedcarbon steel with a hardness of < 180 HB1.49AISI 1211, EN 11SMn30, DIN 1.0715, SS 1912, ČSN 11109, BS 230M7, UNE F.2111, GB Y15, AFNOR S250,GOST A40G, UNI CF9SMn28​ Free machining sulfurized/phosphorizedP1.3and leaded carbon steel with a hardnessof < 160 HB1.53AISI 12L13, EN 11SMnPb30, DIN 1.0718, SS 1914, ČSN 12110, BS 210M16, UNE F.2114, GB Y15Pb,AFNOR S250Pb, GOST AS35G2, UNI CF10SPb20​ P2.1 Plain low carbon steel containing < 0.25 % Cwith a hardness of < 180 HB1.14AISI 1015, EN C15, DIN 1.0401, SS 1350, ČSN 11301 , BS 080A15, UNE F.111, GB 15, AFNOR C18RR,GOST St2ps, UNI Fe360​ P2 Plain carbon steel(steels comprised of mainly iron and carbon)P2.2Plain medium carbon steel containing< 0.55 %C with a hardness of < 240 HB1.00AISI 1030, EN C30, DIN 1.0528, SS 1550, ČSN 12031, BS 080M32, UNE F.1130, GB 30, AFNOR AF50C30,GOST 30G, UNI Fe590​ Steel and cast steel P2.3 Plain high carbon steel containing > 0.55 % C,with a hardness of < 300 HB0.89AISI 1060, EN C60, DIN 1.0601, SS 1655, ČSN 12061, BS 080A62, UNE F513, GB 60, AFNOR 1C60,GOST 60G, UNI C60​ P (steels with alloycontent ≤ 10 % and a hardness of < 45HRC) P3.1 Alloy steel with a hardness of < 180 HB 0.92 AISI 5015, EN 16Mo3, DIN 1.5415, SS 2912, ČSN 15020, BS 1501-240, UNE F.2601, GB 16Mo,AFNOR 15D3, GOST 15M, UNI 16Mo3KW​ Alloy steelP3(carbon steels with an alloying content≤ 10 %)P3.2Alloy steel with a hardness of 180 – 260 HB0.74AISI 4140, EN 42CrMo4, DIN 1.7225, SS 2244, ČSN 15142, BS 708M40, UNE F.8232, GB 42CrMo,AFNOR 42CD4, GOST 40ChFA, UNI 42CrMo4​ P3.3 Alloy steel with a hardness of 260 – 360 HB 0.63 AISI 4140, EN 42CrMo4, DIN 1.7225, SS 2244, ČSN 15142, BS 708M40, UNE F.8232, GB 42CrMo,AFNOR 42CD4, GOST 40ChFA, UNI 42CrMo4​ P4.1 Tool steel with a hardness of < 26 HRC 0.55 AISI D2, EN X155CrVMo12-1, DIN 1.2370, SS 2736, ČSN 19573, BS BD2, UNE F.520A, GB Cr12Mo1V1,AFNOR Z160CDV12, GOST Ch12MF, UNI X155CrVMo121KU​ P4 Tool steel(special alloy steel for tools, dies and molds)P4.2Tool steel with a hardness of 26 – 39 HRC0.47 AISI D2, EN X155CrVMo12-1, DIN 1.2370, SS 2736, ČSN 19573, BS BD2, UNE F.520A, GB Cr12Mo1V1,AFNOR Z160CDV12, GOST Ch12MF, UNI X155CrVMo121KU​ P4.3 Tool steel with a hardness of 39 – 45 HRC 0.38 AISI D2, EN X155CrVMo12-1, DIN 1.2370, SS 2736, ČSN 19573, BS BD2, UNE F.520A, GB Cr12Mo1V1,AFNOR Z160CDV12, GOST Ch12MF, UNI X155CrVMo121KU​