Low alloy steel for the manufacture of molds for plastics

Details Low alloy steel for the manufacture of molds for plastics Low alloy steel for the manufacture of molds for plastics

1997-04-29

1999-01-05

Yee, Deborah

Alloys or metallic compositions

Ferrous

Lead, bismuth, selenium, tellurium or calcium containing

420 87, 420106, 420108, 420109, 148333, 148334, 148335, C22C 3844, C22C 3840, C22C 3850

Patent

active

058558454

ABSTRACT:
Steel for the manufacture of molds for injection molding of plastics, wherein its chemical composition contains, by weight: 0.35%.ltoreq.C.ltoreq.0.5%, 0%.ltoreq.Si.ltoreq.0.5%, 0.2%.ltoreq.Mn.ltoreq.2.5%, 0%.ltoreq.Ni.ltoreq.4%, 0%.ltoreq.Cr.ltoreq.4%, 0%.ltoreq.Mo+W/2.ltoreq.2%, 0%.ltoreq.Cu.ltoreq.1%, 0%.ltoreq.V+Nb/2+Ta/4.ltoreq.0.5%, 0.005%.ltoreq.Al.ltoreq.0.2%, 0%.ltoreq.B.ltoreq.0.015%, 0%.ltoreq.Ti+Zr/2.ltoreq.0.3%, 0%.ltoreq.S+Se+Te .ltoreq.0.2%, 0%.ltoreq.Pb+Bi.ltoreq.0.2%, 0%.ltoreq.Ca.ltoreq.0.1%, the remainder being iron and impurities resulting from the production, the analysis simultaneously satisfying the following relationships: Cr+3.times.(Mo+W/2)+10.times.(V+Nb/2+Ta/4).gtoreq.1, R=3.8.times.C+10.times.Si+3.3.times.Mn+2.4.times.Ni+1.4.times.(Cr+Mo+W/2). ltoreq.11, Qu=3.8.times.C+1.1.times.Mn+0.7.times.Ni+0.6.times.Cr+1.6.times.(Mo+W/2)+k B.gtoreq.3, with kB=0.5 if B.gtoreq.0.0005% and kB=0 if not, and: R.ltoreq.Max(2.33.times.Qu-1, 0.9.times.Qu+4).

REFERENCES:
patent: 3970448 (1976-07-01), Wilson, Jr. et al.
patent: 4673433 (1987-06-01), Roberts
patent: 5110379 (1992-05-01), Finkl
patent: 5244626 (1993-09-01), Finkl et al.
Patent Abstracts of Japan vol. 95, No. 0004 and JP-A-07 102342 (Sanyo Special Steel Co., Ltd.), Apr. 18, 1995.
Patent Abstracts of Japan vol. 16, No. 261 (C-950), JP-A-04 059942 (Aichi Steel Works Ltd.), Feb. 26, 1996.
Patent Abstracts of Japan vol. 14, No. 232 (C-719), May 17, 1990 and JP-A-02 057632 (Nippon Steel Corp.), Feb. 27, 1990.
Patent Abstracts of Japan vol. 14, No. 215 (C-716), May 8, 1990 and JP-A-02 050910 (Nippon Steel Corp.), Feb. 2, 1990.

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