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.