Hot work steel

Details Hot work steel Hot work steel

C - Chemistry, Metallurgy

22

C

75/131, 75/1.3

C22C 38/22 (2006.01) C22C 38/24 (2006.01)

Patent

CA 1170863

ABSTRACT OF THE DISCLOSURE A hot work steel with very high resistance to tempering and a very high strength at elevated temperatures, a good ductility and a comparatively low content of expensive alloying elements: the steel contains in weight percent: 0.30-0.45 C, 0.2-1.0 Si, 0.3-2.0 Mn, 2.0-3.5 Cr, 1.5-2.5 Mo, ? 0-0.01 ?, balance essentially only iron and imperities in normal quantities: for a further embodiment the steel contains a maximum of 1.0, preferably a maximum of 0.5 and suitably a maximum of 0.3% cobalt: in the hardened and tempered condition the steel has a fine grain lath-martensitic or partly bainitic microstructure which is free from retained austenite, and which contains a very finely dispersed intergranular precipitation of carbides, among which vanadium carbides are the dominating carbide phase.

364132

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