Method of making high strength steel tube

Details Method of making high strength steel tube Method of making high strength steel tube

1979-12-26

1983-11-08

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 12F, 148 123, C21D 810

Patent

active

044140428

ABSTRACT:
Improved steel profiles having superior material characteristics are obtained by rolling a precipitation-hardenable fine-grain steel, cooling it from a final rolling temperature above the A.sub.1 -temperature down to a temperature of about 400.degree. C. in an atmosphere in which it is allowed to overage, whereupon the steel plate or strip is then cooled down to room temperature and cold-processed to form an open profile [which can thereupon be converted into a tube by welding together its longitudinally extending edges and] which is then subjected to solution-annealing in order to dissolve coarse precipitants and subsequently further cooled to form finely dispersed precipitants in the profile.

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patent: 4145235 (1979-03-01), Gondo et al.
patent: 4204892 (1980-05-01), Economopolous
patent: 4210467 (1980-07-01), Klatzer et al.

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