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A production process of precision square tubes for steel structures

A production process and steel structure technology, applied in the field of precision square tube production process for steel structure, can solve the problem that the thermal stability and safety of the square tube cannot be effectively guaranteed, the square tube cannot fully adapt to the working environment, and the product quality consistency is poor, etc. problems, to achieve the effect of improving density and stain resistance, improving quality consistency, excellent stain resistance and corrosion resistance

Active Publication Date: 2018-10-16
龙元明筑科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the square tubes currently used in steel structure engineering, because the steel structure is exposed to the external environment for a long time, the working temperature of the external environment changes frequently and the temperature gradient is large, which cannot effectively guarantee the thermal stability and safety of the square tube. At the same time, Since most of the square tubes are made of Q235 cold-rolled strip steel, its corrosion resistance is poor, and it is easy to corrode and rust in the long-term external environment, so that the square tubes cannot fully adapt to the changes in the working environment.
In China, the existing square tubes are all produced by stamping process. This method has gradually failed to meet the performance and production requirements of modern industrial square tubes, especially for the manufacture of some special alloy square tubes. The traditional stamping process has a high scrap rate and low work efficiency. The quality consistency of the obtained products is relatively low. These shortcomings have led to the fact that the square tubes produced in China generally belong to low-end products. In order to ensure that the square tubes have the required thermal stability and safety performance, they have to choose expensive ones. Imported square pipes use square pipes with excellent performance, which undoubtedly greatly increases the input cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A production process for a precision square tube for a steel structure with an outer diameter of 7.0mm×7.0mm and a wall thickness of 0.6mm for a photoelectric tube, comprising the following steps:

[0022] Step 1. Customized process design, select special tube billet, hot extrusion and then cold rolling for many times to reach the required size of the finished square tube, and then adopt the dieless stretching deformation process to obtain the set required square tube, among which 3 For the stretching of the pass, the total section reduction rate R=1-(A+B) / AB=0.714, and the section reduction rate of other passes is 0.485 based on the total section reduction rate and the existing formula;

[0023] After step 2 and step 1 are completed, conduct heat treatment on the square tube, place the square tube in a heat treatment furnace at 1MPa, heat it to 720°C in an inert protective gas such as argon, and control the heating rate at 110°C / h. for 1.5h, and then when it was cooled...

Embodiment 2

[0028] A production process for a precision square tube for a steel structure with an outer diameter of 7.0 mm×10.0 mm and a wall thickness of 0.8 mm for a photoelectric tube, comprising the following steps:

[0029] Step 1. Customized process design, select special tube billet, hot extrusion and then cold rolling for many times to reach the required size of the finished square tube, and then adopt the dieless stretching deformation process to obtain the set required square tube, among which 3 For the stretching of the pass, the total section reduction rate R=1-(A+B) / AB=0.757, and the section reduction rate of other passes is 0.493 based on the total section reduction rate and the existing formula;

[0030] After step 2 and step 1 are completed, conduct heat treatment on the square tube, place the square tube in a heat treatment furnace at 1MPa, heat it to 720°C in an inert protective gas such as argon, and control the heating rate at 110°C / h. for 1.5h, and then when it was co...

Embodiment 3

[0037] A production process of a precision square tube for a steel structure with an outer diameter of 10.0mm×13.0mm and a wall thickness of 1.0mm for a photoelectric tube, comprising the following steps:

[0038] Step 1. Customized process design, select special tube billet, hot extrusion and then cold rolling for many times to reach the required size of the finished square tube, and then adopt the dieless stretching deformation process to obtain the set required square tube, among which 3 For the stretching of the pass, the total section reduction rate R=1-(A+B) / AB=0.823, and the section reduction rate of other passes is 0.476 based on the total section reduction rate and the existing formula;

[0039] After step 2 and step 1 are completed, heat-treat the square tube, place the square tube in a heat treatment furnace at 1MPa, heat it to 700°C in an inert protective gas such as argon, and control the heating rate at 120°C / h. for 2 hours, and then cool down to 50°C with the fu...

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PUM

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Abstract

The invention discloses a production process of a precision square tube for a steel structure. The production process comprises steps as follows: step 1, process design is customized, a special tube blank is selected, and a square tube meeting the set requirements is obtained with a dieless drawing deformation process; step 2, the tube blank is subjected to heat treatment in protective inert gas in a heat treatment furnace after treatment in the step 1 is completed; step 4, the square tube subjected to precision grinding is put in a lubrication groove for surface lubricating treatment; step 5, the square tube obtained in the step 4 is detected, metered and packaged after being qualified. Compared with a conventional production process, the production process of the precision square tube for the steel structure has the advantages that the quality consistency of square tubes produced with the process is effectively improved, the safety of the square tubes meet the standard of foreign imported square tubes, the square tubes have excellent stain resistance and corrosion resistance and can adapt to the constantly changing external working environment for a long time, and the service life of the national square tubes is prolonged.

Description

technical field [0001] The invention relates to the technical field of square tube production for steel structures, in particular to a production process for precision square tubes for steel structures. Background technique [0002] In the square tubes currently used in steel structure engineering, because the steel structure is exposed to the external environment for a long time, the working temperature of the external environment changes frequently and the temperature gradient is large, which cannot effectively guarantee the thermal stability and safety of the square tube. At the same time, Since most of the square tubes are made of Q235 cold-rolled strip steel, its corrosion resistance is poor, and it is easy to corrode and rust in the long-term external environment, resulting in the square tubes not being able to fully adapt to changes in the working environment. In China, the existing square tubes are all produced by stamping process. This method has gradually failed to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 李燕
Owner 龙元明筑科技有限责任公司