Metal treatment – Compositions – Heat treating
Patent
1983-02-24
1984-05-15
Skiff, Peter K.
Metal treatment
Compositions
Heat treating
148 35, 148139, 148141, 164114, C21D 506, C21D 908
Patent
active
044486103
ABSTRACT:
The cast tube (T) is subjected internally in a chill-mould (1) to the uniform spraying of water from 1000.degree. C. approximately to 350.degree. C. approximately. Then it is extracted from the chill-mould and in a furnace is subjected to isothermal bainitization maintenance, after which it is cooled in the atmosphere to ambient temperature. Without it being necessary to add expensive chilling elements, one thus obtains lightened tubes having very good mechanical properties and the ovalization of which remains acceptable.
REFERENCES:
patent: 2855336 (1958-10-01), Curry
patent: 2867555 (1959-01-01), Curry
patent: 3702269 (1972-11-01), Church
patent: 3860457 (1975-01-01), Vourinen et al.
patent: 3954133 (1976-05-01), Miyaoka et al.
patent: 4177088 (1979-12-01), Pierrel
Pont-A-Mousson S.A.
Skiff Peter K.
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