Clad tube blank of dual metal seamless steel tube used for boiler and manufacturing method thereof

Abstract

A clad tube blank of a dual metal seamless steel tube used for a boiler comprises an inner layer and an outer layer; a transition layer is arranged between the inner layer and the outer layer and is respectively bonded with the inner layer and the outer layer completely and metallurgically; the inner layer is cast by a Gr.A-1 material; the transition layer is cast by ferrite or inner layer materials. The transition layer is arranged between the inner layer and the outer layer of the clad tube blank and is respectively bonded with the inner layer and the outer layer completely and metallurgically, therefore, interfacial stress between joint surfaces of the inner layer and the outer layer is reduced, the tube blank is not easy to be layered and the service life of production tubes used for boilers and manufactured by the tube blank is greatly increased.

Description

Composite tube blank of bimetallic seamless steel tube for boiler and production method thereof technical field The invention relates to a bimetal composite material, in particular to a composite tube blank of a bimetal seamless steel pipe for a boiler and a production method thereof. The tube blank is processed into a bimetal seamless steel pipe for a boiler by extrusion or rolling. Background technique TP304L / Gr.A-1 bimetallic tube is the necessary piping material for black liquor boiler heat exchanger. Its composition standard requirements are shown in Table 1. See Table 2 for the performance requirements of the inner layer. Table 1 Material composition requirements for inner and outer layers Table 2 Performance requirements for inner layer materials The service conditions of the black liquor boiler heat exchanger have very strict requirements on the quality of TP304L / Gr.A-1 bimetallic tubes, and at the same time put forward higher requirements on its manufa...

AI Technical Summary

Problems solved by technology

The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned bimetallic pipes, and provide a bimetallic seamless steel pipe for boilers that has a transition layer, the transition layer is completely metallurgically fused with the inner and outer layers respectively, is not easy to delaminate, and has a long service life. Composite tube blank and production method thereof

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