Products
Characteristics
Designation
Strength
280–325 HB
(≈ 950–1,100 N/mm²)
Chemical composition
Thermal conductivity at 100 °C
33.5 W/(mK)
Character
Low-sulphur tool steel, supplied in quenched and tempered condition
Uniform hardness even with maximum dimensions, thanks to the nickel content
Application
Machining
Ideally suited:
Polishing, EDM, nitriding, etching
Suited:
Hard chrome plating
Use
Large cavity plates with deep cavities for items such as bumpers or dashboards, moulding frames
Heat treatment
Already pre-hardened; usually no heat treatment required
Soft annealing:
710 to 740 °C, about 2 to 5 hours
Slow controlled cooling inside the furnace of 10 to 20 °C to about 600 °C
Further cooling in air, max. 235 HB
Hardening:
840 to 870 °C
Maintain curing temperature for 15 to 30 minutes
Cooling in oil/hot bath/air to 180 to 220 °C
Obtainable hardness: 53 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
