W6Mo5Cr4V3 T33440 - GB /T 9943-2025

Grade	W6Mo5Cr4V3
China ISC	T33440
Corresponding Standard	GB /T 9943-2025 High-Speed Tool Steels
Classification	Tool Steel

W6Mo5Cr4V3 Chemical Element Composition Content (%)

Component	C	Si ^①	Mn	P	S ^②	Cr	Mo	W	V
Minimum Value	1.15	0.2	0.15	-	-	3.8	4.7	5.9	2.7
Maximum Value	1.25	0.45	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.

W6Mo5Cr4V3 Mechanical Properties

	Heat Treatment or Condition	Hardness HBW
Delivery condition	Annealing ①	≤262
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 Steel 1

China	Japan	United States	International Organization for Standardization	Germany	United Kingdom
GB	JIS	ASTM	ISO	DIN EN/DIN	BS EN/BS
W6Mo5Cr4V3	SK H52	M3-1	HS6-5-3	S6-5-3	BM3

2 Approximate Comparison Table High-Speed Steel 2

China		Taiwan, China	Japan	South Korea	United States		Russia
GB	ISC	CNS	JIS	KS	ASTM	UNS	GOST
W6Mo5Cr4V3	T66543	SKH52	SKH52	SKH52	M3 Class 1	T11313	Р6М5Ф3

W6Mo5Cr4V3 Corresponding Standards(Same grade name, different standards)

1	GB /T 9943-2008
	W6Mo5Cr4V3 T66543
2	GB 9943-1988
	W6Mo5Cr4V3
3	GB /T 9943-2025
	W6Mo5Cr4V3 T33440

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!