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Method for Precise Size Control of Large Gate-shaped Three-dimensional Stainless Steel Bend

A precision-controlled, stainless-steel technology for pipe bending applications

Active Publication Date: 2022-04-15
CHINA ERZHONG GRP DEYANG HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for precisely controlling the size of a large door-shaped three-dimensional stainless steel elbow, which can not only eliminate the dimensional error caused by bending, but also solve the deformation problem caused by solid solution heat treatment, and ensure the dimensional accuracy

Method used

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  • Method for Precise Size Control of Large Gate-shaped Three-dimensional Stainless Steel Bend
  • Method for Precise Size Control of Large Gate-shaped Three-dimensional Stainless Steel Bend
  • Method for Precise Size Control of Large Gate-shaped Three-dimensional Stainless Steel Bend

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A straight pipe with a length of 5500mm is bent into a shape such as Figure 1 to Figure 3 For the gate bend shown, heat the gate bend to 850°C, keep it warm for 2 hours, then cool it to room temperature in air to relieve stress, then check the opening size, the height difference between the two ports and the bending radius, and correct the opening size according to the inspection results To L+2mm, correct the height difference between the two ports to H, and correct the bending radius to the design size. Then put the gate bend on the tray 20, and use the wedge block 10 to flatten one end of the gate bend, carry out solution heat treatment at a temperature of 1050°C, and immediately immerse the gate bend in water for rapid cooling , the temperature of the water is higher than or equal to 15°C.

[0031] Finally, check the size of the door-shaped elbow. The opening size is L-1mm, the height difference between the two ports is H+2mm, and the bending radius is within the al...

Embodiment 2

[0033] A straight pipe with a length of 5500mm is bent into a shape such as Figure 1 to Figure 3 For the gate bend shown, heat the gate bend to 900°C, keep it warm for 2 hours, and then cool it to room temperature in air to relieve stress, then check the opening size, the height difference between the two ports and the bending radius, and correct the opening size according to the inspection results To L+4mm, correct the height difference between the two ports to H, and correct the bending radius to the design size. Then put the gate bend on the tray 20, and use the wedge-shaped spacer 10 to flatten one end of the gate bend, and carry out solution heat treatment at a temperature of 1100 ° C. Immediately after the treatment, all the gate bends are immersed in water for rapid cooling , the temperature of the water is higher than or equal to 15°C.

[0034] Finally, check the size of the door-shaped elbow. The opening size is L+1mm, the height difference between the two ports is H...

Embodiment 3

[0036] A straight pipe with a length of 5500mm is bent into a shape such as Figure 1 to Figure 3 For the gate bend shown, heat the gate bend to 950°C, keep it warm for 2 hours, then cool it to room temperature in air to relieve stress, then check the opening size, the height difference between the two ports and the bending radius, and correct the opening size according to the inspection results To L+5mm, correct the height difference between the two ports to H, and correct the bending radius to the design size. Then put the gate bend on the tray 20, and use the wedge block 10 to flatten one end of the gate bend, carry out solution heat treatment at a temperature of 1150°C, and immediately immerse the gate bend in water for rapid cooling , the temperature of the water is higher than or equal to 15°C.

[0037] Finally, check the size of the door-shaped elbow. The opening size is L+2mm, the height difference between the two ports is H+2mm, and the bending radius is within the al...

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Abstract

The invention provides a method for precisely controlling the size of a large gate-shaped three-dimensional stainless steel elbow. Stress-relief heat treatment is carried out after bending and forming, and then the size is checked and small deformation correction is performed, so that the opening size of the gate-shaped elbow is larger than the design nominal size by 2 to 5mm, and then solution heat treated. In the present invention, stress-relief heat treatment is carried out after bending forming to fully release the residual stress in the bending forming process, and then the size is inspected, so as to facilitate small deformation correction according to the inspection results. Since the lower surface of the gate-shaped steel pipe enters the water first during solution heat treatment, and the gate-shaped steel pipe itself has a deflection angle, the opening size shrinks by 2 to 5mm during rapid cooling. 2 to 5mm larger, the opening size after solution heat treatment can meet the requirements.

Description

technical field [0001] The invention relates to the technical field of pipe bend processing, in particular to a method for precisely controlling the size of a large gate-shaped three-dimensional stainless steel pipe bend. Background technique [0002] The surge tube of the nuclear power plant voltage stabilizer is connected to the hot section of the primary coolant circuit of the reactor and the voltage stabilizer. Ensure that the working pressure of the main circuit of the nuclear island is stable. [0003] In order to improve the safety of nuclear power, the third-generation nuclear power technology designs the individual pipe sections of the surge tube of the voltage stabilizer to include two elbows and a door-shaped three-dimensional bend with a deflection angle, based on the consideration of thermal stratification during the operation of the wave tube , the deflection angle of the three-dimensional elbow is designed to be 2.5°, that is, the overall rotation of the elbo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/08C21D1/78
CPCC21D9/08C21D1/785
Inventor 陈红宇何宏宇尹蒙司晨亮
Owner CHINA ERZHONG GRP DEYANG HEAVY IND