W9Mo3Cr4V T33620 - GB /T 9943-2025

Grade	W9Mo3Cr4V
China ISC	T33620
Corresponding Standard	GB /T 9943-2025 High-Speed Tool Steels
Classification	Tool Steel

W9Mo3Cr4V Chemical Element Composition Content (%)

Component	C	Si ^①	Mn	P	S ^②	Cr	Mo	W	V
Minimum Value	0.77	0.2	0.2	-	-	3.8	2.7	8.5	1.3
Maximum Value	0.87	0.4	0.4	0.03	0.02	4.4	3.3	9.5	1.7

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.

W9Mo3Cr4V Mechanical Properties

	Heat Treatment or Condition	Hardness HBW
Delivery condition	Annealing ①	≤255
test specimen	Preheating temperature: 800–900 °C，Quenching temperature: 1210–1230 °C (salt bath furnace) or 1220–1240 °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

W9Mo3Cr4V Corresponding Standards(Same grade name, different standards)

1	GB /T 9943-2008
	W9Mo3Cr4V T69341
2	YB /T 084-2016
	W9Mo3Cr4V
3	GB /T 3080-2001
	W9Mo3Cr4V T69341
4	GB 9943-1988
	W9Mo3Cr4V
5	GB /T 9943-2025
	W9Mo3Cr4V T33620

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