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Production method of cold-drawn precision seamless steel pipes

A seamless steel pipe and manufacturing method technology, applied in the field of cold-drawn precision seamless steel pipe manufacturing, can solve problems such as dependence on imports, unsatisfactory yield strength, and tensile strength size deviation, restricting the development of cold-drawn steel pipes, etc., to achieve smooth operation , High rotation deformation resistance and wear resistance, good impact toughness at low temperature

Inactive Publication Date: 2015-02-11
WUXI DAJIN HIGH PRECISION COLD DRAWN STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the drawing processing method performed by a drawing machine can efficiently manufacture cold-worked steel pipes compared with the rolling processing method performed by a pilger rolling machine. This seamless steel pipe is used for hydraulic cylinders and pneumatic cylinders. At present, the yield strength, tensile strength, and dimensional deviation of the highest steel grade stipulated by the current domestic standards cannot meet the actual requirements for the use of hydraulic cylinders and pneumatic cylinders, making my country's seamless steel pipes for hydraulic cylinders and pneumatic cylinders only available. Being able to rely on imports restricts the development of cold-drawn steel pipes in China

Method used

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  • Production method of cold-drawn precision seamless steel pipes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Taking the preparation of a 27SiMn steel pipe with a diameter of 114.3mm and a hole wall thickness of 7.3mm as an example, the following steps are included:

[0024] (1) Heating: Heat the 27SiMn tube blank to 1300°C in a ring furnace for 4 hours to ensure uniform heating of the tube blank;

[0025] (2) Perforation: The heat pipe blank is pierced by a piercer, and the temperature of the capillary tube formed after the piercing is controlled at 1250°C, and the perforation eccentricity is controlled at 4%. The tube blank is visually inspected to remove the burrs on the surface of the tube blank, Warped skin, if there are obvious pits, scratches and cracks that are visible to the naked eye on the surface of the tube blank, they should be removed to avoid flowing into the next process to control the surface quality of the tube blank;

[0026] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing temperature to 60...

Embodiment 2

[0043] Taking the preparation of a 27SiMn steel pipe with a diameter of 139.9mm and a hole wall thickness of 7.9mm as an example, the following steps are included:

[0044] (1) Heating: Heat the 27SiMn tube blank to 1380°C in a ring furnace for 5 hours to ensure uniform heating of the tube blank;

[0045](2) Perforation: The heat pipe blank is pierced by a piercer, and the temperature of the capillary tube formed after perforation is controlled at 1350°C, and the perforation eccentricity is controlled at 5%. The tube blank is visually inspected to remove burrs, Warped skin, if there are obvious pits, scratches and cracks that are visible to the naked eye on the surface of the tube blank, they should be removed to avoid flowing into the next process to control the surface quality of the tube blank;

[0046] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing temperature to 700°C, and the annealing time to 90min, t...

Embodiment 3

[0060] Taking the preparation of a 27SiMn steel pipe with a diameter of 140.4mm and a hole wall thickness of 8.3mm as an example, the following steps are included:

[0061] (1) Heating: Heat the 27SiMn tube billet to 1350°C in a ring furnace for 4.5 hours to ensure uniform heating of the tube billet;

[0062] (2) Perforation: The heat pipe blank is pierced by a piercer, and the temperature of the capillary tube formed after perforation is controlled at 1300°C, and the perforation eccentricity rate is controlled at 4.5%. The tube blank is visually inspected to remove the burrs on the surface of the tube blank, Warped skin, if there are obvious pits, scratches and cracks that are visible to the naked eye on the surface of the tube blank, they should be removed to avoid flowing into the next process to control the surface quality of the tube blank;

[0063] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing tempera...

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Abstract

The invention relates to a production method of cold-drawn precision seamless steel pipes. The production method comprises the steps of: heating: pipe blanks are heated in an annular furnace; perforation: the heat pipe blanks are perforated by a perforation machine; annealing: the pipe blanks are annealed; cold rolling: the annealed pipe blanks are leaded into a pipe rolling machine for cold rolling to obtain rolled pipes; stress relieving: the rolled pipes are leaded into a heating furnace for heating to obtain annealed pipe blanks; acid washing treatment: the acid washing is performed for the annealed pipe blanks to remove scales on the surfaces; phosphating treatment: zinc phosphate chemical generation films are formed on the surfaces of the pipe blanks; saponification treatment: such lubrication films as metallic soaps are formed on the films; cold drawing: the cold drawing is performed for the pipe blanks to be cold drawn to obtain cold-drawn pipes; normalization air-cooling treatment; first straightening treatment; induction furnace quenching treatment; box furnace tempering treatment; honing; thermal straightening treatment; and obtaining of the cold-drawn precision seamless steel pipes. The production method obtains the cold-drawn precision seamless steel pipes with high yield strength, high tensile strength, precise sizes and smooth surfaces.

Description

technical field [0001] The invention belongs to the technical field of steel pipe preparation, and in particular relates to a method for manufacturing cold-drawn precision seamless steel pipes. Background technique [0002] As cold working methods of steel pipes for machine structural use such as carbon steel, alloy steel, or stainless steel, there are known drawing methods by a drawing machine and rolling methods by a pilger mill. Among them, the drawing processing method performed by a drawing machine can efficiently manufacture cold-worked steel pipes compared with the rolling processing method performed by a pilger rolling machine. This seamless steel pipe is used for hydraulic cylinders and pneumatic cylinders. At present, the yield strength, tensile strength, and dimensional deviation of the highest steel grade stipulated by the current domestic standards cannot meet the actual requirements for the use of hydraulic cylinders and pneumatic cylinders, making my country's ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06
CPCB21C37/06
Inventor 许卫东
Owner WUXI DAJIN HIGH PRECISION COLD DRAWN STEEL TUBE
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