Alloys or metallic compositions – Ferrous – Nine percent or more chromium containing
Patent
1990-07-30
1991-11-12
Yee, Deborah
Alloys or metallic compositions
Ferrous
Nine percent or more chromium containing
420 60, 420 37, 420 38, 420585, 148327, C22C 3858
Patent
active
050646109
ABSTRACT:
A heat resistant steel for use as a material of engine valves, having a composition containing, not less than 0.01% and below 0.20% of carbon, from 0.05% to 1.0% of silicon, from 7.5% to 15.0% of manganese, from 2.0% to 20.0% in total of at least one of nickel and cobalt, from 15.0% to 25.0% of chromium, not more than 3.0% of molybdenum, above 2.0% and not more than 10.0% of tungsten, not less than 0.01% and below 0.50% of niobium, from 0.30% to 0.65% of nitrogen, not more than 0.02% of boron, and the balance incidental inclusions and iron. Cobalt content is determined to meet the condition of % Co=(Ni.+-.5)%. The heat resistant steel meets the conditions of: oxidation weight loss when held at 1000.degree. C. for 100 hours being not greater than 0.15 mg/cm.sup.2 /hour in atmosphere; tensile strength being not less than 20 kgf/mm.sup.2 at 900.degree. C. after a solution treatment at 1030.degree. to 1070.degree. C. and a subsequent aging treatment; and creep rupture life at 900.degree. C. under stress load of 6 kgf/mm.sup.2 being not less than 25 hours.
REFERENCES:
patent: 3561953 (1971-02-01), Niimi et al.
patent: 3826689 (1974-07-01), Ohta et al.
Sato Koji
Watanabe Rikizo
Hitachi Metals Ltd.
Yee Deborah
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