Hardened martensitic steel having a low cobalt content, process for manufacturing a part from steel, and part thus obtained

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United States of America Patent

PATENT NO 9175370
APP PUB NO 20110226386A1
SERIAL NO

13054028

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Abstract

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A steel characterized in that its composition is percentages by weight:

    C=0.18-0.30%Co=1.5-4%Cr=2-5%Al=1-2%Mo+W/2=1-4%V=traces-0.3%Nb=traces-0.1%B=traces-30 ppmNi=11-16% where Ni≧7+3.5 AlSi=traces-1.0%Mn=traces-2.0%Ca=traces-20 ppmRare earths=traces-100 ppmif N≦10 ppm, Ti+Zr/2=traces-100 ppm where Ti+Zr/2≦10 Nif 10 ppm

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Patent Owner(s)

Patent OwnerAddress
AUBERT & DUVAL75015 PARIS

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Roch, François Paris, FR 1 4

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