Hot work steel

Details Hot work steel Hot work steel

1982-08-26

1984-07-10

Lewis, Michael L.

Metal treatment

Compositions

Heat treating

C22C 3808, C22C 3812, C22C 3822, C22C 3832

Patent

active

044591624

ABSTRACT:
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 (W/2+Mo), 0.8-1.5 V, 0-0.01 B, balance essentially only iron and impurities 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.

REFERENCES:
patent: 1496980 (1924-06-01), Armstrong
patent: 2686115 (1954-08-01), Clark
patent: 3128175 (1964-04-01), Nagy et al.
patent: 3928025 (1975-12-01), Okuno et al.
patent: 3929428 (1975-12-01), Nishi et al.
Norstrom, L., "Performance of Hot-Work Tool Steels", Scandanavian Journal of Metallurgy, vol. 11, pp. 33-38, (1982).
Lyman, T., ed., et al., Metals Handbook, 8th Edition, vol. 7 & 8, Am. Soc. for Metals, pp. 4, 120 (vol. 7), 199 (vol. 8), TA472A3, (1973).

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