Products
Characteristics
Designation
Strength
280–325 HB
(≈ 950–1,100 N/mm²)
Chemical composition
Thermal conductivity at 100 °C
35 W/(mK)
Character
Alloyed, quenched and tempered tool steel, especially suitable for polishing
High dimensional stability
Application
Machining
Suited:
Etching, EDM
Polishing:
Good polishability; for higher surface requirements we recommend steels for through hardening
Nitriding:
Increases the steel’s wear resistance
Hard chrome plating:
Increases the steel’s wear resistance and particularly its corrosion resistance
Use
Cavity plates, mould inserts and high-strength machine parts
Heat treatment
Already pre-hardened; usually no heat treatment required
Nitriding:
Before nitriding, stress-relieving heat treatment is recommended at 580 °C (Meusburger standard).
Hard chrome plating:
After the hard chrome plating, the mould must be tempered about 3 to 4 hours at 180 °C to avoid brittle fractures from hydrogen.
Hardening:
840 to 860 °C
Cooling:
To about 180/220 °C in oil / hot bath, then in air to about 100 °C
Obtainable hardness: 52 HRC
Tempering:
Slow heating to tempering temperature immediately after hardening
Minimum time in furnace: 1 hour per 25 mm part thickness
Technical tip
Core strength decreases with increasing plate thickness ⇒ for thickness > 300, 1.2738 is recommended
