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Home Material GB /T 9943-2025
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Grade W12Cr4V5Co5
China ISC T32720
Corresponding Standard GB /T 9943-2025
High-Speed Tool Steels
Classification Tool Steel
Properties High Hardness High-Temperature Resistance
W12Cr4V5Co5 Chemical Element Composition Content (%)
Component C Si ① Mn P S ② Cr W V Co
Minimum Value 1.5 0.15 0.15 - - 3.8 11.8 4.5 4.75
Maximum Value 1.6 0.4 0.4 0.03 0.02 4.8 12.8 5.25 5.25
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.
W12Cr4V5Co5 Mechanical Properties
Heat Treatment or Condition
Hardness
HBW
Delivery condition Annealing ① ≤277
test specimen Preheating temperature: 800–900 °C，Quenching temperature: 1220–1240 °C (salt bath furnace) or 1230–1250 °C (box furnace or vacuum furnace)，Quenching medium: oil, salt bath, or nitrogen gas，Tempering temperature: 550 °C ② HRC ≥65 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
W12Cr4v5Co5 SKH10 SKH10 T15 HS6-5-2 S6-5-2 BT15
2 Approximate Comparison Table High-Speed Steel 1
China Japan United States International Organization for Standardization Germany France Russia United Kingdom
GB JIS ASTM ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
W12Cr4V5Co5 SK H10 T15 HS12-1-5-5 S12-1-4-5 1.3202 Z160WKCV12-05-05-04 Р10К5Ф5 BT15
3 Approximate Comparison Table High-Speed Steel 2
China Taiwan, China Japan South Korea United States Germany France Russia United Kingdom
GB ISC CNS JIS KS ASTM UNS DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
W12Cr4V5Co5 T71245 SKH 10 SKH 10 SKH 10 T15 T12015 S 12-1-4-5 1.3202 HS 12-1-5-5 Р10К5Ф5 HS 12-1-5-5
BT15
W12Cr4V5Co5 Corresponding Standards(Same grade name, different standards)
1 GB /T 9943-2008
W12Cr4V5Co5 T71245
2 GB 9943-1988
W12Cr4V5Co 5
3 GB /T 9943-2025
W12Cr4V5Co5 T32720

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