Alloys or metallic compositions – Ferrous – Titanium containing
Patent
1998-01-05
2000-07-04
Yee, Deborah
Alloys or metallic compositions
Ferrous
Titanium containing
420128, 148318, 148320, C22C 3802, C22C 3804, C22C 3814
Patent
active
060834552
ABSTRACT:
The present invention relates to manufacturing methods of nitrided steel parts, having high tensile strength, high fatigue strength, and excellent bending roughness, through nitriding without thermal refining, to thus-manufactured steel parts, and to steel products for nitriding, and steels for nitriding having a specific chemical composition, serving as steel stock for the manufacture of such steel parts. The chemical composition is as follows: C: over 0.20 to 0.60%, Si: 0.05 to 1.0%, Mn: 0.20 to 1.50%, P: 0.08% or less, S: 0.005 to 0.10%, Cu: 0.30% or less, Ni: 0.30% or less, Cr: 0.30% or less, Mo: 0.30% or less, V: 0.20% or less, Nb: 0.05% or less, Ti: 0.003 to 0.03%, Al: 0.08% or less, Ca: 0.005% or less, Pb: 0.30% or less, N: 0.008 to 0.030%, and the balance of Fe and unavoidable impurities. Steel products preferably have the ferrite-pearlite microstructure having a ferrite percentage of not less than 10%. Nitrided steel parts are formed from the steel products serving as steel stock therefor, and have a nitrided case formed in the surface portion thereof.
REFERENCES:
patent: 4838963 (1989-06-01), Huchtemann et al.
Kakimi Harunori
Kamada Yoshihiko
Kato Toru
Kurita Masato
Sakamoto Masanori
Sumitomo Metal Industries Ltd.
Yee Deborah
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