Characteristic :It is one of the W-Mo Co hss grade with good cutting character. The res hardness, hot hardness and wearing resistance are all better than W6Mo5Cr4V2.

Similar steel grade

 

标准	GB	JIS	ASTM	DIN	Bohler	ERASTEEL
钢号	W6Mo5Cr4V2Co5	SKH55	M35	S6-5-2-5 1.3243	S705	EM35

 

 Chemical Composition :(％)

 

C	W	Mo	Cr	V	Co	Mn	Si	P	S
0.87-0.95	5.90-6.70	4.70-5.20	3.80-4.50	1.70-2.10	4.50-5.50	0.20-0.40	0.25-0.45	≤0.03	≤0.02

 

UNDER ANNEALED CONDITIN

Hardness :HB205-255

Delivery status :

As Cold drawn/ Hot rolled/ forged,in annealed condition.

Size:

Cold drawn bar :￠2.2-14.2mm

Hot rolled bar :￠8.0-80.0mm

Forged bar :￠81.0-250.0mm

Coil :￠6.5-16.0mm

Heat Treatment :

Annealing:

Annealing temperature :860-880℃,keep this temperature by 2-4 hours, then cooling to 600℃ in the speed of 20-30℃/h if after cold drawn precess,suggest add stress relieving annealing process.

Under the temperature of 600-700℃,keep this temperature by 2 houres.

Quenching:

Pre-heating in two steps:

Heating temperature under:400-500℃ and 850-900℃

Austenitizing temperature:1180-1220℃

Heating coefficient 10-15sec/mm, quenching under 580-620℃, then cooling to room temperature

Tempering:

Tempering temperature under:540-560℃,tempering 3 times, each time 1hour, then cooling to room temperature.