Process for making bimetallic seamless tubing of steel or specia

Details Process for making bimetallic seamless tubing of steel or specia Process for making bimetallic seamless tubing of steel or specia

1984-12-18

1986-07-08

Larson, Lowell A.

Metal fusion bonding

Process

Encasing a rodlike core within a substantially coextensive...

228155, 228265, 72258, B21C 2322

Patent

active

045988560

ABSTRACT:
A process of making round tubes covered on the inside with a sleeve of a thickness on the order of 20 to 30% of the total thickness of the tubes. The components of the tube consist of steel of strong mechanical characteristics and of an interior of stainless steel or a noble alloy. Both components are united by means of metallurgic cohesion, the result of which is a single tube, in effect. The making of the combined tube is achieved by reforming, piercing and extrusion at the same temperature.

REFERENCES:
patent: 3038251 (1962-06-01), Mohnkern et al.
patent: 3648351 (1972-03-01), Kibler
patent: 4015765 (1977-04-01), Ahmed
patent: 4262516 (1981-04-01), Weber et al.
patent: 4367838 (1983-01-01), Yoshida

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