Casting blank heat treatment method of stainless steel welding strip for nuclear power

Abstract

The invention provides a casting blank heat treatment method of a stainless steel welding strip for nuclear power. The casting blank heat treatment method of the stainless steel welding strip for the nuclear power includes the steps: polishing the surface of a continuous casting blank prior to performing hot delivery of the continuous casting blank to a trolley type high-temperature annealing furnace; heating the continuous casting blank to an expected temperature in the high-temperature annealing furnace; holding the continuous casting blank at the expected temperature; cooling the continuous casting blank in air after completion of temperature holding; and conveying the air-cooled continuous casting blank to a walking-beam heating furnace and performing hot-rolling forming after soaking. The continuous casting blank subjected to heat treatment is good in high-temperature thermoplasticity at a hot rolling stage, and hot-rolling edge crack of the casting blank of the stainless steel welding strip for the nuclear power can be eliminated, so that the casting blank can go through hot-rolling forming smoothly, and domestication of stainless steel welding strips for the nuclear power is achieved.

Description

technical field [0001] The invention relates to a billet heat treatment method for effectively controlling hot-rolled edge cracks of stainless steel welding strips for welding strips, in particular to a casting billet heat treatment method for controlling hot-rolled edge cracks of stainless steel welding strips for nuclear power. Background technique [0002] With the development of nuclear power energy industry, austenitic stainless steel is surfacing on nuclear power plant equipment [0003] It is widely used, such as reactor pressure vessel cylinder surfacing, voltage regulator cylinder surfacing, steam generator tube plate surfacing, etc. While ensuring the mechanical properties of the equipment, it also meets the requirements of the corrosion resistance of the equipment components. [0004] Austenitic stainless steel for welding strip has high ductility, good corrosion resistance and processability. In actual products, due to the effect of ferrite phase stabilizing el...

AI Technical Summary

Problems solved by technology

[0006] Since the ferrite content in the stainless steel welding strip for nuclear power is about 15%, there are a large number of reticular ferrite structures in the slab. The appearance of these reticular structures greatly reduces the high temperature of austenitic stainless steel during hot rolling. Ductility, which increases the tendency of austenitic stainless steel to produce processing cracks, which makes this type of stainless steel suffer from serious edge cracking during hot rolling and rough rolling, and cannot be formed by hot rolling.

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