Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1990-03-02
1991-05-21
Yee, Deborah
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
148325, 148326, 148909, C22C 3838, C21D 908
Patent
active
050172468
ABSTRACT:
A high-strength martensitic stainless steel excellent in corrosion resistance and stress corrosion cracking resistance, the composition of which comprises: under 0.03% carbon, 1% or less silicon, 2.3-7.0% manganese, 8-14% chromium, 0.005-0.2% aluminum, 0.005-0.15% nitrogen, and the balance of iron except incidental elements. The stainless steel can contain nickel, molybdenum, tungsten, copper, vanadium, titanium, niobium, zirconium, tanatalum, hafnium, calcium and rare earth elements under the fixed conditions in addition to the above elements. Heat treatment of the stainless steel comprises: the step of austenitizing at temperatures of 920.degree. C. to 1,100.degree. C., the step of cooling at a cooling rate equal to or higher than the air cooling rate, the step of tempering at temperatures between 580.degree. C. and A.sub.cl point, and the step of cooling at a cooling rate equal to or higher than the air cooling rate.
REFERENCES:
patent: 4047941 (1977-09-01), Wright
Key to Steels, 10 Edition 1974, Verlag Stahlschlussel West Germany.
Miyasaka Akihiro
Ogawa Hiroyuki
Nippon Steel Corporation
Yee Deborah
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