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Home Material GB /T 9943-2025
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Grade W2Mo9Cr4VCo8
China ISC T32470
Corresponding Standard GB /T 9943-2025
High-Speed Tool Steels
Classification Tool Steel
W2Mo9Cr4VCo8 Chemical Element Composition Content (%)
Component C Si ① Mn P S ② Cr Mo W V Co
Minimum Value 1.05 0.15 0.15 - - 3.5 9 1.15 0.95 7.75
Maximum Value 1.15 0.65 0.4 0.03 0.02 4.25 10 1.85 1.35 8.75
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.
W2Mo9Cr4VCo8 Mechanical Properties
Heat Treatment or Condition
Hardness
HBW
Delivery condition Annealing ① ≤269
test specimen Preheating temperature: 800–900 °C，Quenching temperature: 1170–1190 °C (salt bath furnace) or 1180–1200 °C (box furnace or vacuum furnace)，Quenching medium: oil, salt bath, or nitrogen gas，Tempering temperature: 550 °C ② HRC ≥66 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 United Kingdom
GB JIS KS ASTM/AISI ISO DIN EN/DIN BS EN/BS
W2Mo9Cr4VCo8 SKH59 SKH59 M42 HS2-9-1-8 S2-10-1-8 BM42
2 Approximate Comparison Table High-Speed Steel 1
China Japan United States International Organization for Standardization Germany France United Kingdom
GB JIS ASTM ISO DIN EN/DIN W-Nr. NF EN/NF BS EN/BS
W2Mo9Cr4VCo8 YXM34 M33
M34 		HS2-9-1-8 S2-9-2-8 1.3249 Z110DKCWV09-08-04-02-01 BM34
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
W2Mo9Cr4VCo8 T72948 SKH59 SKH59 SKH59 M42 T11342 HS 2-9-1-8 S 2-10-1-8 1.3247 HS 2-9-1-8 2716 HS 2-9-1-8
BM42
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
W2Mo9Cr4VCo8 T72948 SKH59 M42 T11342 HS 2-9-1-8 HS 2-9-1-8 Р2АМ9К5
W2Mo9Cr4VCo8 Corresponding Standards(Same grade name, different standards)
1 GB /T 9943-2008
W2Mo9Cr4VCo8 T72948
2 GB 9943-1988
W2Mo9Cr4VCo8
3 GB /T 9943-2025
W2Mo9Cr4VCo8 T32470

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