Products
Characteristics
Designation
Strength
max. 217 HB
(≈ max. 740 N/mm²)
Chemical composition
Thermal conductivity at 20 °C
42.6 W/(mK)
Character
Alloy steel for quenching and tempering with high resistance and high toughness
Universally usable when quenched and tempered as well as case-hardened
Application
Machining
Suited:
Nitriding, EDM, coating
Unusual:
Welding
Use
Jigs and fixtures, base plates, axes, gear shafts, gear wheels
Heat treatment
Normalising:
840 to 880 °C followed by cooling in air; some components need tempering afterwards
Soft annealing:
680 to 720 °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. 217 HB
Quenching and tempering:
Max. 1,600 N/mm²
Hardening:
820 to 880 °C
Quenching in oil or water
Oil hardening for thin and complex, water hardening for large and simple components
Obtainable hardness: 53−61 HRC
Tempering:
Slow heating to tempering temperature (in order to avoid the formation of cracks) immediately after hardening
At least 60 minutes cooling in air
