Preparation process of stainless steel tube

Abstract

The invention provides a preparation process of a stainless steel tube. The preparation process is characterized by comprising the following steps: continuously polishing the outer surface of the steel tube; cold-rolling the polished steel tube by LG and LD rolling mills; performing degreasing on the cold-rolled steel tube; cleaning the inner wall of the degreased steel tube by stray bullets; drying the steel tube with the inner wall cleaned by the stray bullets by drying equipment; carrying out non-oxidizing thermal treatment on the dried steel tube; straightening the steel tube after non-oxidizing thermal treatment for changing the straightness of the steel tube; carrying out fixed-length cutting on the straightened steel tube; carrying out surface treatment on the steel tube after fixed-length cutting; cleaning the inner wall of the steel tube after surface treatment by the stray bullets; and then detecting flaws and printing codes. According to the invention, a conventional process is improved by multiple steps so as to ensure that the steel tube produced by the preparation process has the characteristics of high precision, high degree of finish and high corrosion resistance.

Description

technical field [0001] The invention relates to a preparation process of a stainless steel pipe, in particular to a preparation process of a high-gloss corrosion-resistant austenitic precision seamless stainless steel pipe. Background technique [0002] In the domestic market, precision seamless stainless steel tubes are generally divided into two types, medium and low-grade general-purpose tubes and high-grade special-purpose tubes. [0003] The preparation process of medium and low-grade precision seamless stainless steel pipes is traditional, and its main improvement direction is to meet domestic quality standards as much as possible. High-grade precision seamless stainless steel pipes have high requirements on the performance of pipes. According to different usage conditions, specific performance needs to meet the requirements of international standards. Therefore, continuous innovation and continuous progress must be made in the preparation process in order to adapt to...

AI Technical Summary

Problems solved by technology

[0006] The traditional process of cleaning the inner wall of the pipe only uses a high-pressure water gun for simple flushing, which has a poor cleaning effect, wastes water resources, and is inefficient

[0007] The traditional drying process uses a high-power hot air blower for drying, which has uneven heating, poor treatment effect, difficult shipment, low efficiency, and high power consumption; at present, the heat treatment of stainless steel tubes in China generally adopts a protective atmosphere control system. Box type or continuous annealing furnace, however, because there is a gap when the material enters and exits the furnace cavity in the continuous annealing furnace, how to prevent the outside air from entering the furnace becomes the technical key to determine the surface quality of the steel pipe after annealing

[0008] In terms of passivation treatment, the passivation film formed by the traditional process cannot fully satisfy the function of completely separating the metal from the corrosive medium, preventing direct contact between the metal and the corrosive medium, and thus basically stopping the dissolution of the metal.

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