Centrifugally cast TP310Cb/T11 bimetal composite tube blank and method for producing same

Abstract

The invention discloses a centrifugally cast TP310Cb / T11 bimetal composite tube blank and a method for producing the same, which belong to the field of casting of tube blanks. The centrifugally cast TP301Cb / T11 bimetal composite tube blank comprises a tube blank inner layer, a tube blank outer layer and a tube blank transitional layer. The method includes controlling components of the inner layer, the outer layer and the transitional layer by means of controlling selection of a tube blank raw material at first; pouring the outer layer; then pouring the transitional layer; and finally pouring the inner layer. The transitional layer is fused with the outer layer, the inner layer is fused with the transitional layer, difference between the components of the outer layer and the components of the outer layer are relieved by the aid of the transitional layer, the purpose of completely fusing is achieved simultaneously, accordingly, interface stress between the inner layer and the outer layer is greatly relieved, stress concentration of interfaces of the inner layer and the outer layer is avoided, and the service life of the centrifugally cast TP310Cb / T11 bimetal composite tube blank is greatly prolonged. Simultaneously, conduction heat resistance of the inner layer and the outer layer is reduced by the aid of metallurgical fusion of the inner layer and the outer layer, and accordingly heat conduction efficiency of a bimetal tube is improved.

Description

technical field [0001] The invention relates to a material selection and production method of a bimetallic composite pipe used for producing a bimetallic seamless boiler steel pipe raw material pipe blank, belonging to the field of pipe blank casting, in particular to a centrifugally cast bimetal composite pipe blank and its production method. Background technique [0002] TP310Cb / T11 bimetal composite pipe is a coal gasification boiler pipe material, mainly used for heat exchangers with corrosive atmosphere. [0003] Coal gasifiers are mainly used in thermal power plants and other fields with high requirements for heat energy exchange. Since the burning of bituminous coal or anthracite contains impurities such as S, SO will be produced after combustion. 2 Such as corrosive medium, the material of the pipe should be able to withstand high temperature and corrosion resistance, and usually high-strength stainless steel is used, such as TP310Cb. However, the thermal conductiv...

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Problems solved by technology

This method will not form a complete metallurgical bond, and the gap at the interface will generate a large thermal resistance during the heat transfer process of the inner and outer layers, which will affect the heat transfer efficiency

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