Thruhard Efficient Extrahard Steel

Thruhard Efficient Extrahard Steel

Steel name: Thruhard Efficient Extrahard
Diagram No.: 2290
Chemical composition in weight %: 0.30% C, 0.10% Si, 1.45% Mn, 0.020% P, 0.003% S, 1.35% Cr, 0.50% Mo, 0.65% Ni
Steel group: Plastic mould steels
Properties: Mould steel with higher hardness 350–395 HB. Hard chrome plateable, flame and laser hardenable, etch-grainable, nitridable (max. 500 °C). Where there is a requirement for polishability > 400 grit and/or sensitive etch-graining designs (e.g. HNO3) we recommend 2738mod.TS(HH). For applications that require a combination of high strength and toughness we recommend grade 2711 ISO-B.
Applications: Compression and injection moulds where higher hardness is needed. Thickness max. 600 mm (width on request).
Reference: Not shown in this demo version.

Heat Treatment
Hardening: Temperature: 880 °C. Duration: 1 minute per mm wall thickness.
Tempering: Temperature: See tempering curve. Duration: 1 hour per 25 mm wall thickness. Cooling: Air.
Diagram note: Average values on samples dia. 25 x 50 mm long, hardened at 880 °C in oil. HB converted from HRC.

Tempering Diagram

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CCT and TTT Diagrams of Steels
CCT and TTT Diagram Calculating Service
Hardenability Diagrams of Steels
Hardenability Calculating Service
Macro Defects in Steel
Metal Etchants
Non-Metallic Inclusions in Steel
Semiconductor Etchants

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