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Home Material GB /T 9943-2025
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Grade CW6Mo5Cr4V2
China ISC T33430
Corresponding Standard GB /T 9943-2025
High-Speed Tool Steels
Classification Tool Steel
CW6Mo5Cr4V2 Chemical Element Composition Content (%)
Component C Si ① Mn P S ② Cr Mo W V
Minimum Value 0.86 0.2 0.15 - - 3.8 4.7 5.9 1.75
Maximum Value 0.94 0.45 0.4 0.03 0.02 4.5 5.2 6.7 2.1
① There is no lower limit specified for the silicon content in electroslag remelted steel.
② Upon the purchaser’s request, special sulfur content requirements may be specified in the contract to improve the machinability of the steel.
CW6Mo5Cr4V2 Mechanical Properties
Heat Treatment or Condition
Hardness
HBW
Delivery condition Annealing ① ≤255
test specimen Preheating temperature: 800–900 °C，Quenching temperature: 1190–1210 °C (salt bath furnace) or 1200–1220 °C (box furnace or vacuum furnace)，Quenching medium: oil, salt bath, or nitrogen gas，Tempering temperature: 550 °C ② HRC ≥64 ③
① The hardness in the annealed and cold-drawn condition is permitted to be up to 50 HBW higher than that in the annealed condition.
② Tempering shall be carried out three times: 1 hour each time in a salt bath, and 2 hours each time in a box furnace or vacuum furnace.
③ The quenched and tempered hardness of the test specimens may be exempt from inspection if the supplier can guarantee it.
New and Old Grade Replacement List
Corresponding Standard Grade
GB /T 9943-2008
Grade
China ISC
GB /T 9943-2025
Grade
China ISC
1 Approximate Comparison Table High-Speed Tool Steels
China United States International Organization for Standardization
GB ASTM ISO
CW6Mo5Cr4V2 M2 high C HS 6-5-2C
2 Approximate Comparison Table High-Speed Steel 2
China United States Germany France
GB ISC ASTM UNS DIN EN/DIN W-Nr. NF EN/NF
CW6Mo5Cr4V2 T66542 M2(高C) T11302 SC 6-5-2 1.3342 HS 6-5-2C
3 Approximate Comparison Table High-Speed Steel 3
China Japan United States International Organization for Standardization European Standard Russia
GB ISC JIS ASTM UNS ISO EN GOST
CW6Mo5Cr4V2 T66542 SKH51 M2 T11302 HS 6-5-2C HS 6-5-2C Р6М5Ф3
CW6Mo5Cr4V2 Corresponding Standards(Same grade name, different standards)
1 GB /T 9943-2008
CW6Mo5Cr4V2 T66542
2 GB 9943-1988
CW6Mo5Cr4V2
3 GB /T 9943-2025
CW6Mo5Cr4V2 T33430

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