Method for improving post-welding comprehensive performance of large-diameter thin-wall duplex stainless steel joint

A technology of duplex stainless steel with comprehensive performance, applied in welding equipment, plasma welding equipment, metal processing equipment, etc., can solve the problems of insufficient welding performance of large-diameter thin-walled duplex stainless steel pipes, collapse and deformation of heat-treated welded pipes, etc., and achieve excellent comprehensive performance performance, reduction of finishing processes, and cost reduction effects

Pending Publication Date: 2021-11-19
中钢不锈钢管业科技山西有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and solve the technical problems of insufficient welding performance of large-diameter thin-walled duplex stainless steel pipes and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] 2205 texturized through a stainless steel as a base material, a material parameter is the size of 6000mm (length) × 8mm (thickness) × 1200mm (diameter), by bending round of the step before welding to ensure material.

[0028] The method of one kind of large-diameter thin-walled duplex stainless steel weld joint after improve overall performance, comprising the steps of:

[0029] S1, welding:

[0030] S1-1, the duplex stainless steel plates to be welded before welding process for welding groove designed as a Y-groove, the blunt edge of 1.75mm, a single port slope angle of 30 °, before welding soldering cleaning by mechanical grinding and end surface vicinity: using a grinder and removing the vicinity of the groove scale, burrs, using sandpaper, rag to remove oil and water, to ensure the cleanliness of the welding position, using the left step;

[0031] S1-2, step S1-1 prepared raw sheet bending forming, spot welding seam and fixedly connected, spot welding...

Example Embodiment

[0044] Example 2

[0045] 2205 texturized through a stainless steel as a base material, a material parameter is the size of 6000mm (length) × 5mm (thickness) × 800mm (diameter), by bending round of the step before welding to ensure material.

[0046] The method of one kind of large-diameter thin-walled duplex stainless steel weld joint after improve overall performance, comprising the steps of:

[0047] S1, welding:

[0048] S1-1, the duplex stainless steel plates to be welded before welding process for welding groove designed as a Y-groove, the blunt edge of 2.25mm, a single port slope angle of 32 °, before welding soldering cleaning by mechanical grinding and end surface vicinity: using a grinder and removing the vicinity of the groove scale, burrs, using sandpaper, rag to remove oil and water, to ensure the cleanliness of the welding position, using the left step;

[0049] S1-2, step S1-1 prepared raw sheet bending forming, spot welding seam and fixedly connected, spot welding ...

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PUM

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Abstract

The invention discloses a method for improving post-welding comprehensive performance of a large-diameter thin-wall duplex stainless steel joint, belongs to the technical field of welding, and solves the technical problems that the welding state performance of a large-diameter thin-wall duplex stainless steel pipe is insufficient, and a heat treatment state welded pipe collapses and deforms. The method comprises the following steps that firstly, welding process regulation and control are carried out, in the welding process, welding heat input is strictly controlled according to the characteristics of a dual-phase steel material, and sigma phase precipitation is reduced; and secondly, heat treatment process regulation and control are carried out, the relative content of alpha/gamma phases is regulated and controlled, the harmful sigma phase is eliminated, meanwhile, the stress distribution rule of a welded pipe is calculated and analyzed, an auxiliary device for preventing deformation of the welded pipe in the heat treatment process is assembled in the pipe, the obtained welded pipe has excellent comprehensive performance and does not have obvious collapse deformation, the subsequent finishing procedure is obviously reduced, and the product performance is greatly improved.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a method for improving the comprehensive performance of a large-caliber thin-wall duplex stainless steel joint after welding. Background technique [0002] Duplex stainless steel is an important high-strength, corrosion-resistant engineering structural material. Its structure is mainly composed of ferrite phase and austenite phase. The comprehensive performance of duplex stainless steel is improved by reducing C and increasing N. , especially the strength, fatigue performance and anti-sensitization performance have been significantly improved. [0003] Duplex stainless steel joints generally undergo solution treatment, and the sigma phase produced by welding is eliminated through a reasonable post-weld heat treatment process, thereby improving the strength and grain boundary corrosion resistance of the joint. However, heat treatment will change the ratio of α / γ phas...

Claims

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Application Information

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IPC IPC(8): B23P15/00B23K10/02
CPCB23P15/00B23K10/02
Inventor 邬莉华李亚杰李岩党淑娥魏晓晋邢海元慕振红
Owner 中钢不锈钢管业科技山西有限公司
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