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Deformation heat treatment method for modifying welding seam tissue capability

A deformation heat treatment, microstructure and property technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve problems such as reducing the quality of welds, and achieve the effects of eliminating residual stress, improving plastic toughness, and improving performance.

Inactive Publication Date: 2008-07-09
BAOJI PETROLEUM STEEL PIPE
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

The stress concentration of the weld greatly reduces the quality of the weld and has a great impact on the corrosion resistance and plastic toughness of the weld

Method used

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  • Deformation heat treatment method for modifying welding seam tissue capability
  • Deformation heat treatment method for modifying welding seam tissue capability
  • Deformation heat treatment method for modifying welding seam tissue capability

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Embodiment Construction

[0022] Embodiments of the present invention are described in conjunction with accompanying drawings 1, 2, 3, 4, 5, 6.

[0023] 1. Deformation heat treatment method 1 to change the microstructure and properties of the weld:

[0024] ① Use an electric heating device to preheat the back of the weld and then keep it warm, so that the temperature of the back of the weld reaches 300°C-500°C:

[0025] ②Adopt the medium frequency induction heating method to heat the front of the weld seam at a heating rate of 30°C / s-100°C / s, so that the overall temperature of the weld seam reaches 700°C-1000°C and then stops;

[0026] ③At a temperature of 750°C-950°C, use rolling rollers to quickly roll the weld along the longitudinal direction of the weld, the rolling speed is 300-500mm / s; the rolling pressure is 4-7t, and the rolling times are 1-2 times. Until the weld reinforcement after rolling is ≤0.4mm. And in the process of rapid welding seam rolling, continue to heat and keep the back of the...

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Abstract

A thermo-mechanical treatment process can change welding seam structure property, which comprises heating up welding seam fast and evenly over phase inversion temperature through adopting medium-frequency induction heating way, rolling the welding seam rapidly under the temperature, refining butt-jointed seam grain under the effects of rolling force and temperature, thereby improving welding seam property, and reaching the basic uniform with base metal. The invention refines welding seam grain through heating and rolling welding seam according to certain technique conditions, eliminates residual stress of welding seam, increases ductibility and toughness of welding seam, and improves structure property of welding seam, thereby welding seam grain size number is improved to about 12 grades from the original zero grade which is approximate with the base metal, and welding seam obtains basic uniformed structure and mechanics property with the base metal.

Description

technical field [0001] The invention relates to a deformation heat treatment method for changing the microstructure and performance of weld seam. Background technique [0002] In recent years, with the continuous improvement of coil quality and steel grades, the requirements for weld quality have become more stringent, and the organizational properties of welds are the most direct proof of welding quality. In the inspection of high-grade steel welds, it is found that the microstructure and properties of the weld and the heat-affected zone are very different from those of the base metal. Generally, the grain size of the weld and the heat-affected zone are around zero, while the base metal The grain size of the material is above ten grades, resulting in the existence of weld stress concentration. The stress concentration of the weld greatly reduces the quality of the weld and has a great impact on the corrosion resistance and plastic toughness of the weld. In order to elimin...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D11/00C21D7/13
Inventor 丁晓军杨忠文毕宗岳谈树美石凯余晗张锦刚严继轩田小江杨志孝樊东海
Owner BAOJI PETROLEUM STEEL PIPE
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