1. AISI S1
Type Shock-resisting steel
Designations France: AFNOR 55 WC 20 Germany: DIN 1.2550 Italy: UNI 58 WCr 9 KU United States: ASTM A681, FED QQ-T-570, SAE J438, UNS T41901
China: GB 5CrW2Si
2. AISI D2
Type High-carbon, high-chromium cold work steel
Designations Germany: DIN 1.2379 Italy: UNI KU United Kingdom: B.S. BD 2 United States: ASTM A681, FED QQ-T-570, SAE J437, SAE J438, UNS T30402
3. AISI D3
Class Tool steel
Type High-carbon, high-chromium cold work steel
Designations France: AFNOR Z 200 C 12 Germany: DIN 1.2080 Italy: UNI X 21O Cr 13 KU Japan: JIS SKD1 United Kingdom: B.S. BD 3 United States: ASTM A681, FED QQ-T-570, SAE J437, SAE J438, UNS T30403
China: GB Cr12
Taiwan: CNS SKD1
Korea: KS STD1
4. AISI O2
Type Oil-hardening cold work steel
Designations-- France: AFNOR 90 MV 8 Germany: DIN 1.2842 Italy: UNI 88 Mn V 8 KU United Kingdom: B.S. Bo 2 United States: ASTM A681, FED QQ-T-570, SAE J437, SAE J438, UNS T31502
China: GB 9Mn2V
5. AISI L6
Type Low-alloy special-purpose tool steel
Designations United States: UNS T61206
China: GB 5CrNiMo
Taiwan: CNS SKT4
Korea: KS STT4
6. AISI H21
Type Tungsten hot work steel
Designations France: AFNOR Z 30 WCV 9 Germany: DIN 1.2581 Italy: UNI X 28 W O9 KU Japan: JIS SKD5 United Kingdom: B.S. BH 21 United States: ASTM A681, FED QQ-T-570, SAE J437, SAE J438, UNS T20821
China: GB 3Cr2W8V
Taiwan: CNS SKD5
Korea: KS STD5
7. AISI H13
Type Chromium hot work steel
Designations France: AFNOR Z 40 COV 5 Germany: DIN 1.2344 Italy: UNI KU Japan: JIS SKD61 Sweden: SS 2242 United Kingdom: B.S. BH 13 United States: ASTM A681, FED QQ-T-570, SAE J437, SAE J438, SAE J467 , UNS T20813
Taiwan: CNS SKD61
Korea: KS STD61
8. AISI H11
France: AFNOR Z 38 CDV 5 Germany: DIN 1.2343 Italy: UNI KU Japan: JIS SKD6 United Kingdom: B.S. BH 11 United States: AMS 6437 , AMS 6485, AMS 6487, AMS 6488, ASTM A681, FED QQ-T-570, SAE J437, SAE J438, SAE J467, UNS T20811
China GB 4Cr5MoSiV
Korea: KS STD6
9. AISI P20
