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Method for processing bent weathering angle steel with low residual stress

A processing method and low residual technology, applied in the direction of improving process efficiency, can solve problems such as increasing the risk factor and angle steel deformation, and achieve the effect of reducing residual stress, reducing residual stress and ensuring stability

Inactive Publication Date: 2019-01-22
ANHUI HONGYUAN IRON TOWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production methods of weather-resistant angle steel mainly include hot rolling production and bending production. No matter which production method is used, residual stress will be generated inside the angle steel during the bending process of the angle steel. After the stress is released, the angle steel may be broken. deformation, increasing its risk factor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Table 1

[0020] process

Embodiment 2

[0023] Table 2

[0024] process

Embodiment 3

[0027] table 3

[0028] process

Cooling after coiling at 550°C

blanking, bending

Insulate at 200°C for 2 hours and air cool to room temperature

0.3MPa air pressure blasts 45HRC, 0.5mm diameter steel shot for 3min

internal residual stress

246.45±34.56MPa

678.32±21.63MPa

546.98±29.65MPa

509.23±30.56MPa

[0029] It can be concluded from Tables 1, 2, and 3 that when the coiling temperature is 650°C~700°C, the heating temperature is 400°C~450°C, and the air pressure of the shot blasting compressed air is 0.5~1MPa, the bent weather-resistant angle steel The internal residual stress has been significantly reduced.

[0030] When the present invention coils the weather-resistant steel, it is unexpectedly found that when the coiling temperature is between 650°C and 700°C, the weather-resistant steel plate can obtain ferrite and a small amount of pearlite structure, and when the temperature exceeds 700°C, the ferrite grains Graduall...

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Abstract

The invention discloses a method for processing bent weathering angle steel with low residual stress. According to the method, residual stress in a steel coil is decreased by adjusting a coiling temperature and a cooling manner; after the steel coil is decoiled and bent, residual stress in angle steel is further released by controlling heat treatment temperature and the cooling manner; and duringshot blasting of the angle steel, residual stress distribution is allowed to be more uniform by controlling shot blasting pressure. Compared with traditional processing technologies for weathering angle steel, the method of the invention greatly reduces the residual stress of the molded weathering angle steel and ensures the stability of the bent weathering angle steel and the use security of thebent weathering angle steel.

Description

technical field [0001] The invention relates to a processing technology for weather-resistant steel, in particular to a processing method for bending weather-resistant angle steel with low residual stress. Background technique [0002] Due to its coating-free properties, weathering steel is increasingly used in steel structures such as bridges and towers. Because weather-resistant angle steel does not require galvanizing treatment, its production process is quite different from traditional angle steel. At present, the production methods of weather-resistant angle steel mainly include hot rolling production and bending production. No matter which production method is used, residual stress will be generated inside the angle steel during the bending process of the angle steel. After the stress is released, the angle steel may be broken. Deformation increases its risk factor. Contents of the invention [0003] The technical problem to be solved by the present invention is to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C21D7/06
CPCC21D7/06C21D8/0247Y02P10/20
Inventor 王自成张姣月刘桂祥
Owner ANHUI HONGYUAN IRON TOWER