BRCMO
  
Identification

 

Designation by Standards
Brand Name Ravne No. Mat. No. DIN EN AISI
BRCMO 882 1.3243 S6-5-2-5 HS6-5-2-5 M35

 

Chemical Composition

 

Chemical Composition in Weight %
C Si Mn Cr Mo Ni V W Others
0.91 max. 0.45 max. 0.40 4.15 - 1.90 6.30 - Co: 4.75

 

General Information

Description
M35 is molybdenum high speed steel. Very high resistance to wear and to softening at elevated temperatures. High resistance of cutting edge and good toughness. Deep hardening response. High hot hardness.

Applications
Highly stressed drills, milling cutters, profile cutting tools, thread cutting drills and cold forming tools.

 

Properties

Physical properties (avarage values) at ambient temperature:
Modulus of elasticity [103 x N/mm2]: 217
Density [g/cm3]: 8.1
Thermal conductivity [W/m.K]: 19.0
Electric resistivity [Ohm mm2/m]: 0.60
Specific heat capacity[J/g.K]: 0.46

Coefficient of Linear Thermal Expansion 10-6 oC-1
20-100 'C 20-200 'C 20-300 'C 20-400 'C 20-500 'C 20-600 'C 20-700 'C
9.7 10.5 11.0 11.4 11.5 12.0 12.5

Continuous Cooling Transformation (CCT) Diagram

 

Heat Treatment

Soft Annealing
Heat to 820-880 'C, cool slowly in furnace. This will produce a maximum Brinell hardness of 230-300.

Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to 650 'C, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.

Hardening
Heat to 450-600 'C, preheat to 850 'C and then to 1050 'C. Harden from a temperature of 1210-1250 'C followed by oil, air quenching or warm bath 550 'C. Hardness after quenching is 64-66 HRC.

Transformation temperatures: Ac1=824 'C , Ac3=853 'C.

Tempering
Tempering temperature: 3 x 1 hour at 540-570 'C.

Tempering Temperature ( 'C) vs. Hardness (HRC)
200 'C 300 'C 400 'C 500 'C 525 'C 550 'C 575 'C 600 'C 650 'C 700 'C
63 61 62 64 64.5 65 64 63 55 46

Effect of Tempering Temperature on Hardness

 

Workability


Forging
Hot forming temperature: 1100-900 'C.

Machinability
No data.