Steels for exhaust valves having improved fatigue strength at hi

Details Steels for exhaust valves having improved fatigue strength at hi Steels for exhaust valves having improved fatigue strength at hi

1996-09-20

1998-05-19

Yee, Deborah

Alloys or metallic compositions

Ferrous

Nine percent or more chromium containing

420 58, 420 59, C22C 3842, C22C 3844

Patent

active

057531790

ABSTRACT:
A steel for exhaust valves comprises C: 0.50-0.65 wt %, Si: 0.1-0.3 wt %, Mn: 5.0-8.0 wt %, Cr: 22.0-24.0 wt %, Ni: 5.0-7.0 wt %, Cu: 0.4-1.0 wt %, Mo: 0.4-2.0 wt %, W: 0.4-2.0 wt %, Nb: 0.4-2.0 wt %, Ti: 0.1-0.3 wt %, N: 0.35-0.50 wt %, sol. Al: 0.005-0.03 wt %, B: 0.001-0.01 wt %, provided that (Cu+Ni): 5.8-7.6 wt %, and the balance being Fe and inevitable impurities and has excellent high-temperature strength, corrosion resistance at room and higher temperatures and oxidation resistance.

REFERENCES:
patent: 3401036 (1968-09-01), Dulis et al.

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