Steel repairable by welding for the manufacture of molds for pla

Details Steel repairable by welding for the manufacture of molds for pla Steel repairable by welding for the manufacture of molds for pla

1997-04-29

1999-01-05

Sheehan, John

Alloys or metallic compositions

Ferrous

Boron containing

420106, C22C 3800

Patent

active

058558462

ABSTRACT:
Steel for the manufacture of molds, and especially of molds for injection molding of plastics, whose chemical composition comprises, by weight: 0.17%.ltoreq.C.ltoreq.0.27%, 0%.ltoreq.Si.ltoreq.0.5%, 0%.ltoreq.Mn.ltoreq.2%, 0%.ltoreq.Ni.ltoreq.2%, 0%.ltoreq.Cr.ltoreq.3%, 0%.ltoreq.Mo+W/2.ltoreq.1.5%, 0%.ltoreq.V+Nb/2+Ta/4.ltoreq.0.5%, 0.002%.ltoreq.B.ltoreq.0.015%, 0.005%.ltoreq.Al.ltoreq.0.2%, optionally at least one element taken from sulfur, selenium and tellurium, the sum of the contents of these elements being smaller than or equal to 0.2% optionally at least one element taken from titanium and zirconium, in contents such that the sum of the titanium content and of half the zirconium content is smaller than or equal to 0.3%, optionally at least one element taken from lead and bismuth, the sum of the contents of these elements being smaller than or equal to 0.2%, optionally calcium in a content lower than or equal to 0.1%, the remainder being iron and impurities resulting from the production, the chemical composition additionally satisfying the following relationships: Cr+3.times.(Mo+W/2)+10.times.(V+Nb/2+Ta/4).gtoreq.2.1, Mo+W/2>0.7% if Cr.ltoreq.1.5%, Qu=3.8.times.C+1.1.times.Mn+0.7.times.Ni+0.6.times.Cr+1.6.times.(Mo+W/2)+0 .6.gtoreq.3, 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.

REFERENCES:
Patent Abstracts of Japan vol. 18, No. 107 (C-1169), Feb. 22, 1994, and JP-A-05 302117 (Aichi Steel Works Ltd.), Nov. 16, 1993.
Patent Abstract of Japan vol. 15, No. 324 (C-859), and JP-A-03 122252 (Hitachi Metals Ltd.), May 24, 1991.

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