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Preparation method of ferritic stainless steel thin-wall welded pipe

A stainless steel and ferrite technology, applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve problems such as affecting material utilization, coarse-grain embrittlement of welded joints, and weld cracking

Pending Publication Date: 2021-09-14
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ferritic stainless steel is sensitive to heat input, and the grains of the structure are easy to coarsen. If the welding process is not properly controlled, it is easy to cause coarse grain embrittlement of the welded joint, which will lead to a decrease in the comprehensive mechanical properties of the welded joint. Ferritic stainless steel thin-walled welded pipe Usually, in the subsequent processing, pipe bending and flaring are required. During the bending and flaring process, problems such as weld cracking are prone to occur. The cracking rate of the bent pipe and the flaring cracking rate are both greater than 10%, which seriously affects the quality of the material. Utilization

Method used

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  • Preparation method of ferritic stainless steel thin-wall welded pipe
  • Preparation method of ferritic stainless steel thin-wall welded pipe

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preparation example Construction

[0020] Aiming at a series of problems in the preparation process of ferritic stainless steel thin-walled welded pipes, the inventors of the present invention conducted in-depth research on the preparation process, and optimized the process steps, welding process parameters, and roll extrusion process parameters, thereby creatively A method for preparing a ferritic stainless steel thin-walled welded pipe is proposed, the method includes: dividing the steel strip into strips according to a positive tolerance to obtain a steel strip; Roll extrusion.

[0021] Below in conjunction with a preferred embodiment, the preparation method of the ferritic stainless steel thin-walled welded pipe of the present invention is described in detail, as follows:

[0022] (1) Steel strip slitting

[0023] Select a ferritic stainless steel strip with a thickness ranging from 0.4mm to 2.0mm as the raw material for preparing welded pipes, for example, the thickness is 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2m...

Embodiment 1

[0038] The material used in this embodiment is 430 ferritic stainless steel, and 138 ferritic stainless steel thin-walled welded pipes with a specification of Φ12*0.4mm are produced according to the chemical composition of the designed steel.

[0039] The welded pipe process of the present embodiment is shown in the table below:

[0040]

[0041] The performance of the welded pipe that present embodiment obtains is shown in the following table:

[0042] name Weld width Bend pipe cracking rate Flare Cracking Rate Before process implementation 1.2mm 12％ 14％ Example 1 0.9mm 0.5％ 0.8％

[0043] Note: The method before the implementation of the process is to weld the steel strip directly after slitting.

Embodiment 2

[0045] The material used in this embodiment is t4003 ferritic stainless steel, and 142 iron-ferritic stainless steel thin-walled welded pipes with a specification of Φ159*2.0mm were produced according to the chemical composition of the designed steel.

[0046] The welded pipe process of the present embodiment is shown in the table below:

[0047]

[0048] The performance of the welded pipe that present embodiment obtains is shown in the following table:

[0049] name Weld width Bend pipe cracking rate Flare Cracking Rate Before process implementation 2.1mm 11％ 12％ Example 2 1.1mm 0.4％ 0.6％

[0050] Note: The method before the implementation of the process is to weld the steel strip directly after slitting.

[0051] It can be seen from the effect data of the above examples 1 and 2 that the method of the present invention can significantly improve the comprehensive mechanical properties of the weld, and significantly reduce the cracking r...

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Abstract

The invention discloses a preparation method of a ferritic stainless steel thin-wall welded pipe, which comprises the following steps: (1) splitting a steel bar according to positive tolerance to obtain the steel bar; and (2), curing and forming the steel bar for welding, and carrying out roller extrusion on a welding area while welding is conducted. The ferrite stainless steel thin-wall welded pipe prepared through the preparation method has excellent forming performance, after pipe bending and flaring forming, the pipe bending rate and the flaring rate are remarkably reduced, the production cost is reduced, the production efficiency is improved, and good economic benefits can be achieved.

Description

technical field [0001] The invention relates to the technical field of manufacturing ferritic stainless steel pipes, in particular to a method for preparing ferritic stainless steel thin-walled welded pipes. Background technique [0002] Since ferritic stainless steel does not contain or contain a small amount of nickel, it can effectively save nickel and reduce costs. At the same time, it has unique properties such as low thermal expansion coefficient, good thermal conductivity, and excellent stress corrosion resistance. It has broad applications in the fields of automobiles, home appliances, and water systems. application prospects. However, ferritic stainless steel is sensitive to heat input, and the grains of the structure are easy to coarsen. If the welding process is not properly controlled, it is easy to cause coarse grain embrittlement of the welded joint, which will lead to a decrease in the comprehensive mechanical properties of the welded joint. Ferritic stainless...

Claims

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Application Information

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IPC IPC(8): B23P15/00B23K31/02
CPCB23P15/00B23K31/027
Inventor 赵振铎李莎柳阳廉晓洁卫海瑞范光伟
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD