Steel useful for the manufacture of molds for the injection mold

Details Steel useful for the manufacture of molds for the injection mold Steel useful for the manufacture of molds for the injection mold

1997-03-03

1998-07-28

Yee, Deborah

Alloys or metallic compositions

Ferrous

Nine percent or more chromium containing

420 91, 420 92, 420 61, 420103, 148325, 148335, 148336, C22C 3842, C22C 3806

Patent

active

057859248

ABSTRACT:
Steel useful for the manufacture of molds for the injection molding of plastics, the chemical composition of which includes, by weight: 0.03%.ltoreq.C.ltoreq.0.25%, 0%.ltoreq.Si.ltoreq.0.2%, 0%.ltoreq.Mn.ltoreq.0.9%, 1.5%.ltoreq.Ni.ltoreq.5%, 0%.ltoreq.Cr.ltoreq.18%, 0.05%.ltoreq.Mo+W/2.ltoreq.1%, 0%.ltoreq.S.ltoreq.0.3%, at least one element chosen from Al and Cu in contents of between 0.5% and 3%, optionally 0.0005%.ltoreq.B.ltoreq.0.015%, optionally at least one element taken from V, Nb, Zr, Ta and Ti, in contents of between 0% and 0.3%, optionally at least one element taken from Pb, Se, Te and Bi, in contents of between 0% and 0.3%, the remainder being iron and impurities resulting from the processing, especially nitrogen; the chemical composition additionally satisfying the relations: Kth=3.8.times.C+9.8.times.Si+3.3.times.Mn+2.4.times.Ni+.alpha..times.Cr+1. 4.times.(Mo+W/2).ltoreq.15, with .alpha.=1.4 if Cr<8% and .alpha.=0 if Cr.gtoreq.8%; Tr=3.8.times.C+1.07.times.Mn+0.7.times.Ni+0.57.times.Cr+1.58.times.(Mo+W/2 )+kB.gtoreq.3.1 with kB=0.8 if B is between 0.0005% and 0.015% and kB=0 if not; if Cr.ltoreq.5%, Kth/Tr.ltoreq.3. Steel block of hardness greater than 350 BH and welding wire.

REFERENCES:
patent: 3926621 (1975-12-01), Asada

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