Forged, non-heat treated, nitrided steel parts and process of ma

Details Forged, non-heat treated, nitrided steel parts and process of ma Forged, non-heat treated, nitrided steel parts and process of ma

1997-07-01

1999-11-16

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148318, C21D 106, C23C 820, C23C 850

Patent

active

059850442

ABSTRACT:
Forged, nitrided steel parts having a high fatigue limit and bending toughness are produced without heat treatment for refining between the forging and nitriding. The steel has a composition consisting essentially, on a weight basis, of: 0.30-0.60% of C, 0.05-1.50% of Si, 0.20-2.00% of Mn, less than 0.02% of P, less than 0.04% of S, not greater than 0.30% of Cr, less than 0.01% of Al, 0.01-0.02% of N, and a balance of Fe and incidental impurities in which the content of V as an impurity is 0.02% or less. The steel composition may further contain at least one element selected from P: 0.02-0.07%, S: 0.04-0.10%, Ca: 0.0003-0.003%, and Pb: 0.01-0.20% in order to provide it with improved machinability.

REFERENCES:
patent: 3259487 (1966-07-01), Mueller et al.
patent: 4279646 (1981-07-01), Kato et al.
patent: 4784922 (1988-11-01), Yoshimura

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