MERILO
  
Identification

 

Designation by Standards
Brand Name Ravne No. Mat. No. DIN EN AISI
MERILO 802 1.2842 90MnCrV8 90MnV8 O2

 

Chemical Composition

 

Chemical Composition in Weight %
C Si Mn Cr Mo Ni V W Others
0.90 0.25 2.00 0.35 - - 0.13 - -

 

General Information

Description
Cold work tool steel with high dimensional stability at heat treatment. Very high resistance to cracking. High machinability, medium thoughness and resistance to wear.

Applications
Measuring tools, machine knives for the wood, paper and metal industry, cold cutting shear blades, thread cutting tools.

 

Properties

Physical properties (avarage values) at ambient temperature:
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.85
Thermal conductivity [W/m.K]: 30.0
Electric resistivity [Ohm mm2/m]: 0.35
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
12.1 13.3 13.8 14.3 14.1 14.2 14.6

Continuous Cooling Transformation (CCT) Diagram






Time-Temperature Transformation (TTT) Diagram



 

Heat Treatment

Soft Annealing
Heat to 690-720 'C, cool slowly in furnace. This will produce a maximum Brinell hardness of 229.

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
Harden from a temperature of 790-820 'C followed by oil or warm bath (180-220 'C) quenching. Hardness after quenching is 63-65 HRC.

Tempering
Tempering temperature: See the data bellow.

Tempering Temperature ( 'C) vs. Hardness (HRC)
100 'C 200 'C 300 'C 400 'C 500 'C 600 'C
63 60 56 50 42 38

Effect of Tempering Temperature on Hardness

 

Workability


Forging
Hot forming temperature: 1050-850 'C.

Machinability
No data.