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Manufacturing method of thick wall steel pipe with small radius-thickness ratio used for building structure

A technology of building structure and manufacturing method, which is applied in the field of steel pipe manufacturing, and can solve the problems of high price, long order cycle, and performance indicators that cannot meet the requirements of building structure earthquake resistance engineering, etc.

Active Publication Date: 2011-10-19
SHENZHEN GENERAL INST OF ARCHITECTURAL DESIGN & RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the small-diameter-thick-ratio thick-wall steel pipes produced by hot-rolling process in foreign countries can meet the requirements of seismic engineering for building structures, they are expensive and have a long order cycle, which is not conducive to the promotion and use of domestic construction projects.
[0004] In addition, although domestic machinery, hydropower and other industries can produce thick-walled steel pipes with small diameter and thickness ratios according to their industry standards, their performance indicators cannot meet the requirements of seismic engineering for building structures.

Method used

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  • Manufacturing method of thick wall steel pipe with small radius-thickness ratio used for building structure
  • Manufacturing method of thick wall steel pipe with small radius-thickness ratio used for building structure
  • Manufacturing method of thick wall steel pipe with small radius-thickness ratio used for building structure

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Experimental program
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Effect test

Embodiment 1

[0026] The outer diameter of the steel pipe in this embodiment is 1400mm, the thickness t=80mm, the inner diameter d=1240mm, and the diameter-thickness ratio d / t is 15.5.

[0027] S10: Material selection, according to the thickness of the steel pipe, select Q345GJ-B grade steel plate with a thickness of 80mm as the mother plate;

[0028] S20: blanking, according to the diameter of the steel pipe, calculate the required steel plate width and then cut and blank;

[0029] S30: Heating, preheating the steel plate before bending, the preheating temperature is 950±10°C, and the holding time is 2 hours;

[0030] S40: roll round, such as figure 1 As shown, the steel plate is hot-rolled into a circle with a three-roller plate rolling machine, the temperature of the initial rolling workpiece is 920°C, and the final rolling workpiece temperature is 820°C;

[0031] S50: Welding, welding round steel into steel pipe;

[0032] S60: weld seam inspection, in accordance with the quality requ...

Embodiment 2

[0036] The outer diameter of the steel pipe in this embodiment is 1200 mm, the thickness t=100 mm, the inner diameter d=1000 mm, and the ratio of diameter to thickness is 10.

[0037] S10: Material selection, according to the thickness of the steel pipe, select Q345GJ-B grade steel plate with a thickness of 100mm as the mother plate;

[0038] S20: blanking, according to the diameter of the steel pipe, calculate the required steel plate width and then cut and blank;

[0039] S30: Heating, preheating the steel plate before bending, the preheating temperature is 955±10°C, and the holding time is 2 hours;

[0040] S40: roll round, such as figure 2 As shown, the steel plate is hot-pressed into a semi-circle with a semi-circular steel mold, the initial pressing temperature of the workpiece is 928°C, and the final pressing temperature of the workpiece is 845°C;

[0041] S50: Welding, welding two semicircular steels into steel pipes;

[0042] S60: weld seam inspection, in accordan...

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Abstract

The invention relates to a manufacturing method of steel pipes, in particular to a manufacturing method of a thick wall steel pipe with a small radius-thickness ratio used for a building structure. The manufacturing method comprises the following steps of: with a Q345GJ-B-level steel pipe as a mother blank, blanking, heating, rolling into a circle, welding, correcting distortion, carrying out heat treatment and the like to obtain the thick wall steel pipe with the small radius-thickness ratio. The steel pipe is suitable for requirement of earthquake proof construction of the building structure and has lower manufacturing cost.

Description

technical field [0001] The invention relates to a method for manufacturing a steel pipe, in particular to a method for manufacturing a steel pipe with a small diameter-thickness ratio and a thick wall used for building structures. Background technique [0002] In building structure engineering, especially in large-span space building structure engineering, thick-walled steel pipes with small diameter-to-thickness ratio (that is, steel pipes with a small ratio of inner diameter d to steel pipe wall thickness t) are often used as structural components. However, conventional domestic steel pipe manufacturing methods such as cold rolling, hot rolling, hot rolling or hot pressing cannot produce thick-walled steel pipes with small diameter-to-thickness ratios that meet the requirements of seismic engineering for building structures and are reasonably priced. [0003] For example, the hot rolling method can generally only produce thin-walled steel pipes with small and medium diamet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23K31/02B21D5/00
Inventor 刘琼祥刘臣张建军郭满良王启文
Owner SHENZHEN GENERAL INST OF ARCHITECTURAL DESIGN & RES
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