Products
Characteristics
Designation
Strength
max. 280 HB
(≈ max. 950 N/mm²)
Chemical composition
Thermal conductivity at 100 °C
30 W/(mK)
Character
Nickel-alloyed steel for through hardening with moderate machinability
Very high compressive and bending strength
Very high toughness and good through hardenability, also for bigger cross sections
Application
Machining
Suited:
Polishing: best metallurgical properties for mirror polishing
Hard chrome plating: increases the steel’s wear resistance and particularly its corrosion resistance
Etching
Ideally suited:
EDM
Unusual:
Nitriding
Use
Demanding cavity plates and mould inserts with high surface requirements (mirror polishing)
Stamping, forming and bending inserts for particularly high compressive and bending strength
Heat treatment
Soft annealing:
610 to 650 °C, about 2 to 5 hours
Slow controlled cooling inside the furnace of 10 to 20 °C to 600 °C
Further cooling in air, max. 260 HB
Hardening:
840 to 870 °C
Quenching in oil/hot bath/air
Obtainable hardness: 53–58 HRC
Tempering:
Slow heating to tempering temperature immediately after hardening
Minimum time in furnace: 1 hour per 20 mm part thickness
Tempering twice is recommended
Technical tip
To avoid unwanted warping during plastic injection, the tempering temperature after hardening must exceed the operating temperature by 50 °C.
Example:
Operation at 200 °C
Tempering at 250 °C = 52 HRC
