Products
Characteristics
Designation
Strength
max. 186 HB
(≈ max. 635 N/mm²)
Chemical composition
Thermal conductivity at 20 °C
44 W/(mK)
Character
Steel for case hardening for parts requiring a core strength of 800 to 1,100 N/mm² and high wear resistance
Application
Machining
Suited:
Polishing, etching, EDM
Unusual:
Nitriding: usually, hardened parts are not nitrided → loss of hardness
Recommended:
Hard chrome plating results in increased wear and corrosion resistance
Use
Guide elements, cores and mechanical parts with high surface hardness
Synthetic resin press moulds for processing thermoplastics and thermosetting plastics
Heat treatment
Soft annealing:
670 to 710 °C, about 2 to 5 hours
Slow, controlled cooling inside the furnace
Further cooling in air, max. 205 HB
Carburising:
900 to 950 °C. The choice of the carburising agent and carburising temperature depends on the desired surface carbon content, the carburising graph and the required case depth.
Case hardening:
870 to 930 °C in powder/salt bath, cooling in oil/hot bath at 160 to 250 °C
Intermediate stress-relieving heat treatment:
630 to 650 °C for about 2 to 4 hours with slow furnace cooling
Preheating:
350 °C depending on dimensions
Hardening:
Curing temperature: 810 to 840 °C
Harden in oil at approx. 60 °C
Cooling:
To about 100 °C in oil, then in air to about 50 °C
Tempering:
1 hour per 20 mm part thickness, min. 2 hours
Tempering:
150 to 200 °C
