Production process of large-caliber thin-walled seamless stainless steel pipe

Abstract

The invention relates to a production process of a large-caliber thin-walled seamless stainless steel pipe, which comprises the following production steps: (a) firstly, preparing 0Cr18Ni10Ti stainless steel pipe bloom made by an arc furnace and electroslag remelting or vacuum induction and electroslag remelting; (b) after pickling and solution treatment, carrying out first cold-rolled processing for the stainless steel pipe bloom to make a coarse steel pipe; (c) after degreasing and solution treatment, carrying out the crude steel pipe by cold-drawing and caliber-enlarging processing for the coarse steel pipe to make a large-caliber steel pipe; (d) after degreasing and solution treatment, carrying out second cold-rolled processing for the stainless steel pipe to make a refined steel pipe;and (e) after degreasing and solution treatment, straightening, pipe cutting, pickling and inspection, the refined steel pipe being made into a large-caliber thin-walled seamless stainless steel pipefinished product. With the process of the invention, the length of the steel pipe can reach or exceed 6000mm, and the steel pipe does not produce twisting and spinning amboss phenomenon and the like.

Description

technical field [0001] The invention relates to a production process of a stainless steel large-caliber thin-wall seamless steel pipe in the metallurgical industry. Background technique [0002] In the metallurgical industry, the last process of large-diameter thin-walled seamless steel pipes is generally produced by the spinning process, but the spinning process is used. On the one hand, the length of the spinning steel pipe is generally about 2000mm, which cannot reach or exceed 6000mm; , The large-diameter thin-walled seamless steel pipe produced by the spinning process is easy to twist, easy to produce spinning lines, and has poor precision. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a production process for stainless steel large-caliber thin-wall seamless steel pipes, which can produce steel pipes with a length of up to 6000 mm and whose surface is smooth w...

AI Technical Summary

Problems solved by technology

[0002] In the metallurgical industry, the last process of large-diameter thin-walled seamless steel pipes is generally produced by the spinning process, but the spinning process is used. On the one hand, the length of the spinning steel pipe is generally about 2000mm, which cannot reach or exceed 6000mm; , the large-diameter thin-walled seamless steel pipe produced by the spinning process is easy to be twisted, easy to produce spinning lines, and has poor precision