Internal Standard | BS | DIN | IS | EN | SAE/AISI | JIS | UNI (Italy) | SS (Sweden) | CSA (Canada) | AS/NZS | GOST (Russia) | ISO | AFNOR (France) | GB/T (China) | Note |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
T1 | BM2 | HS18-0-1 | T11301 | HS18-0-1 | T1 | SKH2 | X80WCrV18-1 | SS 2722 | T11301 | AS H1 | P18 | ISO 4957 HS18-0-1 | Z80WDCV18-01-01 | W18Cr4V | High tungsten high-speed steel with good red hardness |
M2 | BM2 | HS6-5-2C | T11302 | HS6-5-2C | M2 | SKH51 | X82WMo6Cr4V5 | SS 2726 | T11302 | AS M2 | R6M5 | ISO 4957 HS6-5-2C | Z85WDCV06-05-02 | W6Mo5Cr4V2 | Most widely used general-purpose HSS, good wear resistance |
M35 | BM35 | HS6-5-2-5 | T11312 | HS6-5-2-5 | M35 | SKH55 | X82WMo6Cr4V5Co5 | SS 2727 | T11312 | AS M35 | R6M5K5 | ISO 4957 HS6-5-2-5 | Z85WDCV06-05-02-05 | W6Mo5Cr4V2Co5 | Cobalt addition improves hot hardness, used in drill bits, taps |
M42 | BM42 | HS2-9-1-8 | T11322 | HS2-9-1-8 | M42 | SKH59 | X82CoMo12Cr4V5 | SS 2732 | T11322 | AS M42 | R12F3 | ISO 4957 HS2-9-1-8 | Z82COMO12-04-05 | Co8Mo2Cr | Superior wear resistance, hardness, often used in aerospace tooling |
Note: High-Speed Steels are specialized alloy steels with high hardness, red hardness, and wear resistance. Standards like GOST (Russia) use R6M5, R18, etc., which are functionally close to M2 and T1. ISO numbers may follow compositions but mechanical equivalency may differ slightly.