Model Number: FWM-2017-008
Brand Name: BOZHONG
Key Specifications/Special Features:
1.3348 alloy steel round barsBrand name: BR885Ravne number: 885Materials number:1.3348DIN: S2-9-2EN: HS2-9-2
AISI: M7
Chemical composition (in weight %)
C: 0.98%
SI: 0.70% Max
Mn: 0.40 Max
Cr: 4.00%
V: 1.95%
W: 1.80%
Applications
M7 is widely used for cutting tools in machining operations
Sendzimir rolls, segment and circular cutters, profile cutting tools, thread cutting drills and cold forming tools
Physical properties (average values) at ambient temperature
Modulus of elasticity [103x N/mm2]: 217
Density [g/cm3]: 8.30
Thermal conductivity [W/m.K]: 19.0
Electric resistivity [ohm mm2/m]: 0.65
Specific heat capacity [J/g.K]: 0.46
Coefficient of linear thermal expansion 10-6oC-1
Soft annealing
Heat to 820-880oC, cool slowly in furnace, this will produce a maximum Brinell hardness of 230-280
Hardening
Heat up to 450-600oC, preheat to 850oC and then to 1050oC
Harden from a temperature of 1180-1220oC followed by oil, air quenching or warm bath at 550oC
Hardness after quenching is 64-66 HRC
Tempering
Tempering temperature: 3 x 1 hour at 540-560oC, hardness after tempering is min 64 HRC
Forging
Hot forming temperature: 1100-900oC
Cold working: in the annealed condition M7 may be cold worked by conventional methods
Machinability
Machinability is medium, rating about 60% that of the W group water hardening low alloy tool steels at 100% for comparison
Corrosion resistance
Although this alloy contains chromium and molybdenum it is still a steel and thus will corrode, it should be protected from rusting
Welding
This is a complex alloy but is weldable, consult the supplier for procedures and details
By certification [File Integrity]
