Stainless steel weldless steel tube for ship and producing technique

A seamless steel pipe and production process technology, applied in the field of stainless steel seamless steel pipe and its production process, can solve the problems of low mechanical strength and elongation performance, easy pitting corrosion and grain boundary corrosion, and short service life of steel pipes, and achieve good Market prospect, low price, effect of cost reduction

Inactive Publication Date: 2008-07-16
江苏长盈不锈钢管有限公司
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  • Abstract
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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

Method used

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Embodiment Construction

[0019] The specific implementation is taken as an example below for further description:

[0020] A stainless steel seamless steel pipe for ships is made of 00Cr24Ni6Mo2N duplex stainless steel, the specific production steps are as follows: a, round steel preparation, the mass ratio of each component in the round steel is: C≤0.03, Mn≤2.0, S≤0.03, P ≤0.035, Si≤1.0, Ni: 4.5~7.5, Cr: 23~26, Mo: 2.0~3.0, N≤0.2, Fe: 60.205~70.5; b, put the round steel into the electric arc furnace for heating; c, Hot-rolled piercing; d, cutting head; e, adopting a ratio of HF:HNO 3 :H 2 O=1:1:10 acid solution pickled the steel pipe for 5 to 6 hours at a temperature of 60°C to 80°C; f, grinding; g, lubrication; h, cold rolling; i, degreasing; j, Solid solution heat treatment is carried out on the steel pipe with a gas generator at a temperature of 1130°C to 1180°C; k, straightening; l, pipe cutting; m, the proportioning concentration is HF:HNO 3 :H 2 O=1:1:10 acid solution pickling the steel pip...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C38/58B23P15/00C21D9/08C23G1/08
Inventor 黄志斌俞晓东陆翠玉
Owner 江苏长盈不锈钢管有限公司
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