Products
Characteristics
Designation
Strength
max. 255 HB
(≈ max. 860 N/mm²)
Chemical composition
Thermal conductivity at 100 °C
21 W/(mK)
Character
High-alloy steel for through hardening with moderate machinability
Extreme wear resistance and low warping
Good dimensional stability, toughness and through hardenability
Application
Machining
Suited:
EDM, hard chrome plating
Polishing: in hardened condition
Ideally suited:
Nitriding: the hardness of the base material will not fall below 60 HRC
Not suited:
Etching: coarse carbides are washed out
Use
Cavity plates and mould inserts as well as cutting punches, punch backing plates and die plates with high requirements on wear resistance
Heat treatment
Soft annealing:
800 to 850 °C, about 2 to 5 hours
Slow, controlled cooling inside the furnace of 10 to 20 °C per hour to about 600 °C
Further cooling in air, max. 235 HB
Hardening:
— 1,020 °C
— 1,060 bis 1,080 °C
Quenching in oil/air/hot bath
Obtainable hardness: 63−65 HRC
Tempering:
Slow heating to tempering temperature (in order to avoid the formation of cracks) immediately after hardening
Triple tempering at maximum secondary hardening temperature is recommended
Rapid cooling following the tempering improves dimensional stability
Maximum hardness achievable after tempering: 60−62 HRC
Technical tip
Secondary hardening, makes very good base material for nitriding or coating
