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Method for improving corrosion resistance of low-alloy ultrahigh-strength steel weldment

An ultra-high-strength steel and corrosion-resistant technology, applied in welding equipment, auxiliary welding equipment, metal processing equipment, etc., can solve the problems of poor corrosion resistance of welded joints, achieve good corrosion resistance and wear resistance, and improve corrosion resistance , The effect of reducing welding residual stress

Active Publication Date: 2020-12-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of poor corrosion resistance of welded joints in the prior art, improve the corrosion resistance of weldments, and prolong the service life

Method used

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  • Method for improving corrosion resistance of low-alloy ultrahigh-strength steel weldment
  • Method for improving corrosion resistance of low-alloy ultrahigh-strength steel weldment
  • Method for improving corrosion resistance of low-alloy ultrahigh-strength steel weldment

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Embodiment 1

[0035] An embodiment of the present invention provides an improved post-weld heat treatment process for low-alloy ultra-high-strength steel plates. Post-weld heat treatment is performed on a section of weld seam of a base material 1 with a thickness of 10 mm. The base material 1 is Q1100 ultra-high-strength steel. The austenite formation temperature A was measured C1 The temperature is 645°C, and the thickness of the weld 21 is 10mm.

[0036] Such as figure 1 As shown, the post-weld heat treatment in this embodiment adopts local heating, including the following steps:

[0037] (1) Install the heater so that the heater completely covers the weld zone, and the uniform heating zone formed by the heater covers the entire welding joint 2, and the width of the uniform heating zone is 60mm for the weld zone and both sides;

[0038] (2) Install the insulation belt 3, the insulation material is ceramic fiber, the insulation belt 3 covers the weld area and both sides 200mm, and is fix...

Embodiment 2

[0049] Embodiments of the present invention provide an improved post-weld surface treatment process for low-alloy ultra-high-strength steel plates, such as figure 2 As shown, the Q1100 steel plate welded joint 2 after post-weld heat treatment in embodiment 1 is subjected to surface treatment, including the following steps:

[0050](1) Derust, remove weld reinforcement and polish the welded joint 2 to make the surface roughness reach Ra1.6, then degrease the surface of the welded joint 2, and place the pretreated weldment in workbench;

[0051] (2) select alumina ceramic powder with a purity greater than 99.7% and a particle size of 60 μm, dry it, and use laser additive manufacturing to form a layer of 2 mm thick alumina ceramic layer 4 in the welding seam and the 60 mm working area on both sides, Then the surface of the alumina ceramic layer 4 is ground and polished;

[0052] (3) Spray a layer of anti-rust paint layer 5 on the surface of the weldment processed by the above ...

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Abstract

The invention provides a method for improving corrosion resistance of a low-alloy ultrahigh-strength steel weldment. The method comprises postweld heat treatment and surface treatment, wherein the postweld heat treatment is to perform local heat treatment on a welded joint, and involves heating, heat preservation and cooling on the welded joint; the postweld surface treatment is to perform surfacepretreatment, additive manufacturing and post-treatment on the welded joint subjected to the postweld heat treatment, and additive manufacturing is to lay aluminum oxide ceramic powder on the surfaceof the welded joint and form an aluminum oxide ceramic layer through laser rapid melting deposition. According to the method, through the postweld heat treatment and the postweld surface treatment, the residual stress is reduced, the uniformity of a welded structure is improved, the galvanic corrosion sensitivity is reduced, the corrosion resistance and wear resistance of the welded joint are improved, then the comprehensive performance of the weldment is improved, and the service life of the weldment is prolonged.

Description

technical field [0001] The invention relates to the field of corrosion and protection, in particular to a method for improving the corrosion resistance of low-alloy ultra-high-strength steel weldments. Background technique [0002] Low-alloy ultra-high-strength steel is widely used in bridges, hull structures, large offshore platforms, construction machinery and other structural parts with high strength requirements. With the continuous development of structural parts in the direction of large-scale and lightweight, the requirements for the strength level of steel plates keep improving. In recent years, a series of low-alloy ultra-high-strength steels have been developed through technologies such as micro-alloying and controlled rolling and controlled cooling. Due to the low content of alloying elements, especially elements that improve the corrosion resistance of materials (such as Cr, Ni, etc.) The content is less, resulting in low corrosion resistance of low-alloy ultra-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/50C21D3/06B23K37/00C04B41/00
CPCC21D9/50C21D9/505C21D3/06B23K37/00C04B41/0036C21D2221/00
Inventor 李红英陈杰汤伟刘丹
Owner CENT SOUTH UNIV
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