HIGH SPEED STEEL Performance FOR HSS-M7
HSS CODE: W2Mo9Cr4V2 (M7)
Chemical compositons(%):
C Si Mn W Mo Cr V Others
0.97-1.05 0.20-0.45 0.15-0.40 1.40-2.10 8.20-9.20 3.50-4.00 1.75-2.25
International Code:
ASTM: M7
UNS:T11307
JIS:SKM58
DIN:S2-9-2
BS:
NF:HS2-9-2
ROCT:
ISO:HS2-9-2
China:W7
Density: Annealed(g/cm) 7.94
Heat treatment:Starting: 1100 Finishing:900
Usage:For making all kinds of thread tools,e.g.taps,dies;also for drill bit,endmills and other tools for lath cutting;all kinds of cold punch die.
Anneal temperature (℃) 840-860
Stress relief Temperature(℃):600-650
Quench temperature (℃):1190-1210
Coolant media of quench : salt bath at 600℃,or Oil cool or air cool
Normal temperature of temper(℃): 540-570
Quench and temper HRC: 65-67
Bending Strength(Mpa):
Impact Toughness(MJ/㎡):
HRC at 600℃(HRC):
Character: It's universal used HSS of W-Mo series.With good Grandability and higher heat hardness and ductile.Good performance of Grinding and Cutting.There are satisfied results for working normal Hrc materials. But it is easy being oxidized and decarburization in Heat treatment and Heat working.