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Home Material GB /T 9943-2025
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Grade CW6Mo5Cr4V3
China ISC T33450
Corresponding Standard GB /T 9943-2025
High-Speed Tool Steels
Classification Tool Steel
CW6Mo5Cr4V3 Chemical Element Composition Content (%)
Component C Si ① Mn P S ② Cr Mo W V
Minimum Value 1.25 - 0.15 - - 3.75 4.7 5.9 2.7
Maximum Value 1.32 0.7 0.4 0.03 0.02 4.5 5.2 6.7 3.2
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.
CW6Mo5Cr4V3 Mechanical Properties
Heat Treatment or Condition
Hardness
HBW
Delivery condition Annealing ① ≤262
test specimen Preheating temperature: 800–900 °C，Quenching temperature: 1180–1200 °C (salt bath furnace) or 1190–1210 °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 Japan South Korea United States International Organization for Standardization Germany
GB JIS KS ASTM/AISI ISO DIN EN/DIN
CW6Mo5Cr4V3 SKH53 SKH53 M3 HS6-5-3 HS6-5-3
2 Approximate Comparison Table High-Speed Steel 1
China Japan United States Germany
GB JIS ASTM DIN EN/DIN W-Nr.
CW6Mo5Cr4V3 SK H53 M3-2 S6-5-3 1.3344
3 Approximate Comparison Table High-Speed Steel 2
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Sweden United Kingdom
GB ISC CNS JIS KS ASTM UNS ISO DIN EN/DIN W-Nr. NF EN/NF SS14 BS EN/BS
CW6Mo5Cr4V3 T66545 SKH53 SKH53 SKH53 M3 Class 2 T11323 HS 6-5-3 S 6-5-3 1.3344 HS 6-5-3 2725 HS 6-5-3
4 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
CW6Mo5Cr4V3 T66545 SKH53 M3(高碳) T11323 HS 6-5-3C HS 6-5-3C Р6М5Ф3
CW6Mo5Cr4V3 Corresponding Standards(Same grade name, different standards)
1 GB /T 9943-2008
CW6Mo5Cr4V3 T66545
2 GB 9943-1988
CW6Mo5Cr4V3
3 GB /T 9943-2025
CW6Mo5Cr4V3 T33450

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