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Cold-rolled high-hardness seamless steel pipe manufacturing method

A technology of seamless steel pipe and manufacturing method, applied in the direction of manufacturing tools, other manufacturing equipment/tools, etc., can solve the problems of yield strength, dimensional deviation can not meet the requirements of use, restricting the development of cold-rolled steel pipes, and seamless steel pipes relying on imports, etc. Achieve the effect of good oil storage performance, extended service life and high tensile strength

Inactive Publication Date: 2015-04-29
WUXI JIANGNAN HIGH PRECISION COLD DRAWN PIPE
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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 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, so that my country's seamless steel pipes for hydraulic cylinders and pneumatic cylinders can only rely on imports. Restricted the development of cold-rolled steel pipe in China

Method used

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  • Cold-rolled high-hardness seamless steel pipe manufacturing method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] Taking the preparation of a 27SiMn steel pipe with a diameter of 149.3mm and a hole wall thickness of 8.43mm as an example, the following steps are included:

[0026] (1) Heating: Heat the 27SiMn tube blank to 1200°C in a ring furnace for 4 hours to ensure uniform heating of the tube blank;

[0027] (2) Perforation: The heat pipe billet is pierced by a piercer, and the temperature of the capillary tube formed after piercing is controlled at 1150°C, and the perforation eccentricity is controlled at 4%. The pipe billet 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;

[0028] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing temperature to 600°C and the annealing time to 70 minut...

Embodiment 2

[0047] Taking the preparation of a 27SiMn steel pipe with a diameter of 131.9mm and a hole wall thickness of 8.9mm as an example, the following steps are included:

[0048] (1) Heating: Heat the 27SiMn tube blank to 1350°C in a ring furnace for 5 hours to ensure uniform heating of the tube blank;

[0049] (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;

[0050] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing temperature to 70...

Embodiment 3

[0066] Take the preparation of a 27SiMn steel pipe with a diameter of 142.4mm and a hole wall thickness of 8.32mm as an example, including the following steps:

[0067] (1) Heating: Heat the 27SiMn tube blank to 1300°C in a ring furnace for 4.5 hours to ensure uniform heating of the tube blank;

[0068] (2) Perforation: The heat pipe blank is pierced by a piercer, and the temperature of the capillary tube formed after perforation is controlled at 1200°C, and the perforation eccentricity rate 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;

[0069] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing temperature to ...

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Abstract

The invention relates to a cold-rolled high-hardness seamless steel pipe manufacturing method. The manufacturing method includes the steps of heating a pipe billet in a circular furnace; punching the heated pipe billet by a puncher; annealing the pipe billet; spraying borax to descale; placing the annealed pipe billet in a pipe mill for hot rolling; performing pipe separation by separating a hot-rolled pipe from a mandrel; performing stress relief annealing, namely, heating the hot-rolled pipe in the heating furnace to obtain the annealed pipe billet; performing acid washing treatment to remove rust scale on the surface; phosphating to enable the surface to form a zinc phosphate chemical film; performing saponification treatment to form a metallic soap lubricating film and the like; performing cold rolling on the obtained pipe billet to be subjected to cold rolling to obtain a cold-rolled pipe; performing heat treatment to reduce residual stress; performing pre-straightening treatment to reduce residual stress; performing induction furnace quenching treatment; tempering in a box-type furnace; honing; performing hot straightening to obtain a high-precision steel pipe. The steel pipe obtained by the method is high in hardness and precise in size.

Description

technical field [0001] The invention belongs to the technical field of steel pipe preparation, and in particular relates to a method for manufacturing a cold-rolled high-hardness seamless steel pipe. 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 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, so that my country's seamless ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P23/00
CPCB23P15/00
Inventor 支向军
Owner WUXI JIANGNAN HIGH PRECISION COLD DRAWN PIPE
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