Double-P type radiant tube and manufacture method thereof

Abstract

The invention relates to a double-P type radiant tube. The double-P type radiant tube is arranged in a heat treatment furnace and comprises three parallel arrayed straight tubes, and both ends of each straight tube are symmetrically welded with two bent tubes, wherein the middle of one bent tube is provided with an air inlet tube coaxially arranged with the middle straight tube, while the other bent tube is welded with one end of a supporting tube coaxial to the middle straight tube. The manufacture method of the double-P type radiant tube comprises the following steps of: (1) calculating the manufacture size of the double-P type radiant tube; (2) cutting a plate, rolling the plate and welding the plate into the straight tubes; (3) punching and forming a plate into half bent tubes and welding the half bent tubes into the bent tubes; and (4) argon arc welding the manufactured straight tubes and the bent tubes and welding the supporting tube.

Description

technical field

[0001] The invention relates to a double-P-type radiant tube and a manufacturing method thereof, in particular to a plate-type double-P-type radiant tube for heat treatment of cold-rolled automobile plates in the metallurgical industry and a manufacturing method thereof. Background technique

[0002] With the rapid development of the automobile industry, the requirements for steel strips used in automobiles are getting higher and higher, and heat treatment must be carried out before use. In order to achieve continuous annealing of steel strips and improve the work efficiency of heat treatment, for this reason, there are usually installed in the heat treatment furnace. Radiant tubes for radiative heat treatment of steel strips. When heating, the gas burns in the radiant tube, which is isolated from the workpiece in the heat treatment furnace, and the workpiece is heated by radiant heat to ensure the good surface quality of the steel strip product.

[0003] Si...

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