Manufacturing method for seamless stainless steel pipe resistant to corrosion of anions

A stainless steel pipe and manufacturing method technology, applied in the field of seamless pipes, can solve the problems that stainless steel pipes cannot withstand, chloride ions and other media corrode, cannot meet the needs of use, etc., and achieve uniform thickness, smooth inner and outer surfaces, and tolerance dimensional accuracy. high effect

Inactive Publication Date: 2016-04-06
SHANGHAI BAOLUO STAINLESS STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the defects in the prior art that stainless steel pipes manufactured by conventional methods cannot withstand the corrosion of chloride ions and other media, and cannot adapt ...

Method used

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Embodiment

[0030] A method for manufacturing a seamless stainless steel pipe resistant to negative ion corrosion, comprising the following steps:

[0031] Step 1, the finished seamless stainless steel pipe is manufactured; in an embodiment of the present invention, the manufacturing process of the finished pipe includes

[0032] (1) The diameter of the tube blank is 67mm, the wall thickness is 5.2mm, and it is ground and solution annealed;

[0033] (2) Rolling for the first time to a diameter of 38mm and a wall thickness of 2.3mm, followed by degreasing and solution annealing for the first time;

[0034] (3) The second rolling, rolling to a diameter of 25mm and a wall thickness of 1.3mm, followed by a second degreasing and solution annealing;

[0035] (4) Rolling for the third time to a diameter of 22 mm and a wall thickness of 0.8 mm, followed by degreasing, drying and bright annealing for the third time;

[0036] (5) The fourth rolling, rolling to a diameter of 19mm and a wall thickn...

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Abstract

The invention discloses a manufacturing method for a seamless stainless steel pipe resistant to corrosion of anions. The manufacturing method includes the first step of manufacturing of a finished pipe and the second step of electropolishing. The second step of electropolishing further comprises the first procedure of selecting electrolyte, the second procedure of electrifying treatment and the third procedure of stirring. The finished seamless pipe made of Cr, Ni and Mo at a certain mass percentage is subjected to the electropolishing process, so that the thickness of the pipe wall of the seamless stainless steel pipe is uniform, the tolerance dimension is high in precision, and the seamless stainless steel pipe can bear corrosion of chloride ions and other media and meet the use requirements in a high-cleaning complex medium environment. The finished pipe also has the effect that the inner and outer surfaces are smooth and clean.

Description

technical field [0001] The invention relates to the technical field of seamless pipes, in particular to a method for manufacturing an anion-resistant seamless stainless steel pipe. Background technique [0002] Anion refers to an atom that obtains one or several electrons due to external effects, so that the number of electrons in the outermost shell reaches a stable structure; common anions include: chloride ion Cl, sulfide ion S2 and hydroxide ion OH. [0003] Stainless steel and its products, as technical materials and products, not only have good corrosion resistance, but also have good smoothness and other characteristics. They are widely used in the national economy and people's daily life, and the scope of application is becoming more and more wide. [0004] Austenitic stainless steel tubes are suitable for heat exchange equipment in the chemical, petroleum, petrochemical and power industries with cooling media such as river water, groundwater and sea water, and are ...

Claims

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Application Information

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IPC IPC(8): C25F3/24C22C38/58C22C38/44
Inventor 余泽曹奇伟卿建明谭克辉
Owner SHANGHAI BAOLUO STAINLESS STEEL TUBE
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