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Production process for super duplex stainless steel tube

A technology of duplex stainless steel and production process, applied in the field of production process of super duplex stainless steel pipe, can solve the problems of low production efficiency, difficult to guarantee wall thickness accuracy, complex production process, etc., so as to improve the yield and product accuracy, shorten the The effect of simple production time and production process

Inactive Publication Date: 2014-07-23
ZHEJIANG RUIMAI STAINLESS STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the relatively high alloy content of super duplex stainless steel in the conventional steel pipe making process, the production efficiency is low and the success rate is also low, especially in the cold drawing process, cracks appear in the deformation zone, and the wall thickness accuracy is difficult to guarantee
Such as the application publication number: CN103266281A, a kind of super duplex stainless steel pipe and its production process, which discloses a relatively complicated production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0030] 2. Embodiment 2, a production process of a super duplex stainless steel pipe, is characterized in that it comprises the following process steps:

[0031] 1) Cold rolling: the steel pipe is cold-rolled back and forth 5 times by the upper and lower rollers. During the process of resetting the rollers after each cold rolling, the mandrel and the steel pipe rotate together by 20°. Repeat the above steps to ensure that the mandrel and the steel pipe are completely The sum of the rotation angles is 100°;

[0032] The lubricating oil is sprayed from the mandrel to the inner surface of the steel pipe, the flow rate of the lubricating oil is 2 liters per minute, the injection pressure is 2.5Mpa, and the temperature of the lubricating oil is 20°C.

[0033] 2) Degreasing and cleaning; spray the entire surface of the steel pipe with carbon tetrachloride, and then dry the surface of the steel pipe with high-pressure gas;

[0034] 3) Heat treatment: heating in a heating furn...

Embodiment 3

[0039] 3. Embodiment 3, a production process of a super duplex stainless steel pipe, comprising the following process steps:

[0040] 1) Cold rolling: the steel pipe is cold-rolled back and forth 4 times by the upper and lower rollers. During the process of resetting the rolls after each cold rolling, the mandrel and the steel pipe are rotated 30° together, and the above steps are repeated to ensure that the mandrel and the steel pipe are together. The sum of the rotation angles is between 120°;

[0041] During the cold rolling process, lubricating oil is sprayed from the mandrel to the inner surface of the steel pipe, the flow rate of the lubricating oil is 3 liters per minute, the injection pressure is 3Mpa, and the temperature of the lubricating oil is 25°C.

[0042] 2) Degreasing and cleaning; Spray the entire surface of the steel pipe with gasoline, and then dry the surface of the steel pipe with high-pressure gas;

[0043] 3) Heat treatment: heating in a heating fur...

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Abstract

The invention relates to a production process for a super duplex stainless steel tube. The method comprises the technological steps of: 1) cold rolling: subjecting a steel tube to cold rolling by an upper roller and a lower roller back and forth, during roller resetting at the end of each cold rolling, rotating a core rod and the steel tube by 15 degrees-30 degrees together, and repeating the steps to ensure that the rotation angle sum of the core rod and the steel tube is in the range of 90 degrees-120 degrees; 2) degreasing cleaning; 3) heat treatment: conducting heating in a heating furnace for 5-10min slowly at a temperature ranging from normal temperature to 350DEG C; conducting rapid heating at 350-550DEG C for 20-30s; performing medium heating at 550-1000DEG C for 6-8min; and conducting heat preservation at 1000-1100DEG C for 5-10min; and 4) acid pickling. The production process provided by the invention is simple, and can avoid the phenomena of steel tube cracking and uneven wall thickness during cold rolling, uneven heating and other problems during heat treatment, thus improving the steel tube yield and the product accuracy, and greatly shortening the production time.

Description

technical field [0001] The invention relates to a production process of stainless steel pipes, in particular to a production process of super duplex stainless steel pipes. Background technique [0002] Super duplex stainless steel refers to the duplex steel with PREN (pitting resistance equivalent) greater than 40, containing 25% Cr and high molybdenum (>3.5%), high nitrogen (0.22% ~ 0.30%), the main grades are UNS S32550 (UR52N+ ), S32750 (SAF 2507) and S32760 (Zeron 100), were respectively developed by companies such as French CLI, Swedish SANDVIK and British MATER+PLATT. Their deformed materials came out in about 1990 and 1991, and entered the market in recent years. This variety of stainless steel tube has special properties such as chloride resistance and crevice corrosion resistance. It is a heat exchanger component in the state of seawater desalination and brine odor medium. It also has high mechanical strength and good plasticity. [0003] Due to the relatively h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/10
Inventor 赵建军
Owner ZHEJIANG RUIMAI STAINLESS STEEL TUBE