Processing method for improving quality of inner surface of austenite stainless steel tube

Abstract

The invention provides a processing method for improving quality of an inner surface of an austenite stainless steel tube. The method comprises the following step: successively carrying out solution treatment, straightening, pulling of a fixed mandrel and aftertreatment on a rolled austenite stainless steel insertion tube to obtain the austenite stainless steel tube with the high-quality inner surface. The processing method is simple in process, easy to implement, high in production efficiency and low in energy consumption; and the austenite stainless steel tube processed by the method is good in quality of the inner surface and the outer surface, even in structure and excellent in mechanical property; the yield of one-time detection in nondestructive test reaches 90% or above; and therefore, the processing method can be widely applied to the processing industry of stainless steel thin-walled slender tubes.

Description

technical field [0001] The invention belongs to the technical field of stainless steel pipe processing, and in particular relates to a processing method for improving the inner surface quality of an austenitic stainless steel pipe used in nuclear power. Background technique [0002] As the key structural material of nuclear reactor core, austenitic stainless steel pipes are widely used in cladding tubes, insertion tubes, shrink tubes, sleeves, etc. of control components and fuel components. The special application environment puts forward very strict requirements on the processing method, material properties, dimensional accuracy and non-destructive testing of austenitic stainless steel pipes for nuclear power. The inner diameter tolerance of stainless steel pipes for nuclear power reactor cores, especially cladding tubes for core components is only ±0.01mm. The standard groove size of the inner and outer surface of the ultrasonic non-destructive testing is 0.025mm ~ 0.045m...

AI Technical Summary

Problems solved by technology

If it is processed by rolling, the inside of the pipe is prone to fold and scratch defects, which also leads to a low pass rate of non-destructive testing, and the pass rate of each batch of products fluctuates greatly. If it is processed by fixed die drawing, it is easy to produce Wrinkle defects on the inner surface of the pipe result in a very low pass rate of ultrasonic testing (only about 10%); (3) the existing processing methods of rolling or fixed-die drawing pipe products are difficult to achieve on the inner surface of the pipe during mass production. effective control

Moreover, the production efficiency of rolling processing is low, the production cycle is long, and the production cost is high

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