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Method for assisting heat treatment of steel pipe welding seams

A technology for assisting steel pipes and welding joints, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as hardness cannot be achieved

Inactive Publication Date: 2015-04-29
CHINA NUCLEAR IND 23 CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the hardness of the weld seam after heat treatment cannot meet the ASME specification requirements when welding large-diameter and thick-walled steel pipes in winter, this invention proposes a method for assisting the heat treatment of the steel pipe weld seam so that the hardness of the steel pipe weld seam after heat treatment Meet ASME specification requirements and improve the quality of base metal welding

Method used

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  • Method for assisting heat treatment of steel pipe welding seams
  • Method for assisting heat treatment of steel pipe welding seams
  • Method for assisting heat treatment of steel pipe welding seams

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Wrap the electric heating sheet at the weld of the steel pipe, and wrap the insulation cotton outside the electric heating sheet;

[0020] (2) if figure 1 as shown, figure 1 The direction indicated by the middle arrow is left. For the long welded joint of the pipe section: wrap the left electric heating sheet 13 and the right electric heating sheet 14 at a position where the distance between the steel pipe 10 and the electric heating sheet 11 wrapped at the weld 12 is 550 mm, The distance L from the right edge of the left electric heating sheet 13 to the left edge of the electric heating sheet 11 is 550 millimeters; the distance L from the left edge of the right electric heating sheet 14 to the right edge of the electric heating sheet 11 is 550 millimeters; and use silicic acid The aluminum insulation cotton wraps the steel pipe 10 completely, and the thickness of the aluminum silicate insulation cotton is 200 millimeters; wherein, the left electric heating sheet 1...

Embodiment 2

[0026] (1) Wrap the electric heating sheet at the weld of the steel pipe, and wrap the insulation cotton outside the electric heating sheet;

[0027] (2) if figure 1 as shown, figure 1 The direction indicated by the middle arrow is left. For the long welded joint of the pipe section: wrap the left electric heating sheet 13 and the right electric heating sheet 14 at a position where the distance between the steel pipe 10 and the electric heating sheet 11 wrapped at the weld 12 is 600 mm, The distance L from the right edge of the left electric heating sheet 13 to the left edge of the electric heating sheet 11 is 600 millimeters; the distance L from the left edge of the right electric heating sheet 14 to the right edge of the electric heating sheet 11 is 600 millimeters; and use silicic acid The aluminum insulation cotton wraps the steel pipe 10 completely, and the thickness of the aluminum silicate insulation cotton is 220 mm; wherein, the left electric heating sheet 13 and the...

Embodiment 3

[0033] (1) Wrap the electric heating sheet at the weld of the steel pipe, and wrap the insulation cotton outside the electric heating sheet;

[0034] (2) if figure 1 as shown, figure 1The direction indicated by the middle arrow is left. For the long welded joint of the pipe section: wrap the left electric heating sheet 13 and the right electric heating sheet 14 at a position where the distance between the steel pipe 10 and the electric heating sheet 11 wrapped at the weld 12 is 750 mm, The distance L from the right edge of the left electric heating sheet 13 to the left edge of the electric heating sheet 11 is 750 millimeters; the distance L from the left edge of the right electric heating sheet 14 to the right edge of the electric heating sheet 11 is 750 millimeters; and use silicic acid The aluminum insulation cotton wraps the steel pipe 10 completely, and the thickness of the aluminum silicate insulation cotton is 250 millimeters; wherein, the left electric heating sheet 13...

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Abstract

The invention belongs to the technical field of metal welding. In order to solve the problem that the hardness cannot reach the standard requirement of ASME through measurement after heat treatment of the welding seams when an A335GR.P91 large-diameter and thick-walled steel tube is welded in winter, the invention provides a method for assisting heat treatment of steel pipe welding seams. The method comprises the following steps: (1) wrapping heaters at the welding seams, and wrapping the heaters with heat insulating material; (2) for the welding seams at long tube sections, wrapping the heaters at the positions 550-700 mm away from the heaters wrapped at the welding seams on the steel tube, and using the heat insulating material to completely wrap the steel tube; (3) for the welding seams on short tubes and bends, using the heat insulating material to completely wrap the steel tube; (4) during the heat treatment process, for the welding seams at long tube sections, controlling the temperature of the steel tube wrapped by the heater at the position 550-700 mm away from the heaters wrapped at the welding seams to be 200-300 DEG C. By using the method provided by the invention, the hardness value at the welding seams meets the standard requirement of ASME.

Description

technical field [0001] The invention belongs to the technical field of metal welding, and in particular relates to a method for assisting the heat treatment of weld joints of steel pipes. Background technique [0002] The domestic A335.P91 steel pipe is equivalent to the domestic 9Cr-1Mo martensitic heat-resistant steel, which is a large-diameter, thick-walled ( 508×32.54mm) steel pipes, mainly used in thermal power and chemical industries, as high-pressure steam pipes or reheating hot section pipes, etc. When A335.P91 steel pipes are used as high-pressure steam pipelines in the chemical industry, the hardness of the steel pipes after welding and heat treatment is required to meet the requirements of ASME (American Society of Mechanical Engineers) specifications, and the Brinell hardness (hereinafter referred to as hardness) value is less than It is equal to 241HB. The heat treatment after welding is mainly to eliminate the large stress of the welding part, improve the st...

Claims

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Application Information

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IPC IPC(8): C21D9/50
CPCC21D9/50
Inventor 张健王叶
Owner CHINA NUCLEAR IND 23 CONSTR
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