Stainless steel weldless steel tube for ship and producing technique

Abstract

The invention relates to a stainless steel seamless pipe in metallurgical industry and the manufacturing process for the stainless steel seamless pipe; wherein, the steel pipe is made of 00Cr24Ni6Mo2N dual phase stainless steel; the manufacturing process for preparing the ship borne stainless steel seamless pipe comprises the following production steps of a. round steel preparation; b. heating; c. hot-puncturing process; d. end cropping; e. pickling; f. repair grinding; g. lubrication; h. cold rolling processing; i. degreasing; j. solution heat treatment; k. straightening; l. pipe cutting; m. pickling; n. inspection of finished products. The invention solves the problems of lower mechanical strength and extensibility, shorter service life and high prices in present 316L stainless steel pipes used in ship seawater channels and provides a novel ship borne dual phase stainless steel seamless pipe and the manufacturing process and has the advantages of no production of pitting corrosion and grain boundary corrosion of the steel pipes, higher mechanical strength and extensibility, longer service life as well as low price and low cost.

Description

technical field [0001] The invention relates to a stainless steel seamless steel pipe in the metallurgical industry and a production process thereof, and is mainly used in marine seawater pipelines. Background technique [0002] Stainless steel seamless steel pipe is a common metallurgical metal product. At present, duplex stainless steel seamless steel pipe is mainly used in seawater pipelines of ships on the market. Due to its special environmental requirements, the duplex stainless steel seamless steel pipe currently in use has better resistance Corrosion, pitting resistance and stress resistance performance, the most commonly used material is 316L, that is, 00Cr17Ni14Mo2, although the steel pipe of this material can basically meet the basic requirements of seawater pipelines for ships, but in general, the performance of various aspects is not Very ideal, especially prone to pitting corrosion and grain boundary corrosion, which directly leads to the reduction of the mecha...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve a series of problems existing in the 316L stainless steel pipes currently used in seawater pipelines of ships, including pitting corrosion and grain boundary corrosion, low mechanical strength and elongation performance of steel pipes, and short service life , expensive and other issues, provide a new naval duplex stainless steel seamless steel pipe and its production process, so that the steel pipe will not produce pitting corrosion and intergranular corrosion, high mechanical strength and elongation performance, so that the service life is long, and at the same time Inexpensive, reduces costs