Heat-treating tubular steel sections

Details Heat-treating tubular steel sections Heat-treating tubular steel sections

1978-10-13

1980-05-27

Dean, R.

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

148 124, 148 39, 148150, 148152, 148153, C21D 908

Patent

active

042048923

ABSTRACT:
A tubular steel section at a temperature, above Ac.sub.1, at which the steel contains at most 15% ferrite is subjected to martensitic and/or bainitic quenching followed by still air cooling. The effects of quenching are limited to a surface layer, internal and/or external, of the section. At the end of the quenching step the part of the section remote from the quenched surface layer or layers is at a temperature above 675.degree. C. which permits self-tempering of the quenched surface layer or layers at a temperature above 450.degree. C. and ensures transformation of residual austenite to a martensite-free structure.

REFERENCES:
patent: 3926689 (1975-12-01), Respen et al.

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