W6Mo5Cr4V2Al T66546 - GB /T 9943-2008

Grade	W6Mo5Cr4V2Al
China ISC	T66546
Corresponding Standard	GB /T 9943-2008 High-Speed Tool Steels
Classification	Tool Steel

W6Mo5Cr4V2Al Chemical Element Composition Content (%)

Component	C	Si ^①	Mn	P	S ^②	Cr	Ni ^③	Cu ^③	Mo	W	V	Al
Minimum Value	1.05	0.2	0.15	-	-	3.8	-	-	4.5	5.5	1.75	0.8
Maximum Value	1.15	0.6	0.4	0.03	0.03	4.4	0.3	0.25	5.5	6.75	2.2	1.2

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.

W6Mo5Cr4V2Al Mechanical Properties

condition	Heat Treatment or Condition	Hardness HBW
Delivery condition	Annealing	≤269
sample	Quenching and Tempering	HRC ≥65

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.

New and Old Grade Replacement List

Corresponding Standard	Grade
GB /T 9943-2008	Grade China ISC
GB /T 9943-2025	Grade China ISC

W6Mo5Cr4V2Al Corresponding Standards(Same grade name, different standards)

1	GB /T 9943-2008
	W6Mo5Cr4V2Al T66546
2	YB /T 084-2016
	W6Mo5Cr4V2Al
3	GB 9943-1988
	W6Mo5Cr4V2Al M2Al 501
4	GB /T 9943-2025
	W6Mo5Cr4V2Al T33630

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