W6Mo5Cr4V4 T66544 - GB /T 9943-2008

Grade	W6Mo5Cr4V4
China ISC	T66544
Corresponding Standard	GB /T 9943-2008 High-Speed Tool Steels
Classification	Tool Steel

W6Mo5Cr4V4 Chemical Element Composition Content (%)

Component	C	Si ^①	Mn	P	S ^②	Cr	Ni ^③	Cu ^③	Mo	W	V
Minimum Value	1.25	-	-	-	-	3.8	-	-	4.2	5.2	3.7
Maximum Value	1.4	0.45	0.4	0.03	0.03	4.5	0.3	0.25	5	6	4.2

① The lower limit of silicon content in electro-slag steel is not specified.
② Upon the request of the buyer, to improve the machinability of the steel, the sulfur content may be specified as 0.06% to 0.15%.
③ Cu and Ni are residual contents.

W6Mo5Cr4V4 Mechanical Properties

condition	Heat Treatment or Condition	Hardness HBW
Delivery condition	Annealing	≤269
sample	Quenching and Tempering	HRC ≥64

Notes:
① When the tempering temperature is 550 to 570°C, temper twice, each time for 1 hour; when the tempering temperature is 540 to 560°C, temper twice, each time for 2 hours; when the tempering temperature is 530 to 550°C, temper three times, each time for 2 hours.
② For annealed and cold-drawn condition, the hardness may be allowed to increase by 50 HBW over the annealed condition.

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