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Production method of cold-drawn fine-bored rolled tube

A manufacturing method and cold-drawing and fine-boring technology are applied in the manufacturing field of cold-drawn, fine-boring and rolled pipes, which can solve the problems of restricting the development of cold-rolled steel pipes, yield strength and dimensional deviation cannot meet the requirements of use, and seamless steel pipes rely on imports. , to achieve the effect of extending the service life, good oil storage performance 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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  • Production method of cold-drawn fine-bored rolled tube

Examples

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Comparison scheme
Effect test

Embodiment 1

[0024] Taking the preparation of a 27SiMn steel pipe with a diameter of 135.3mm and a hole wall thickness of 7.23mm as an example, the following steps are included:

[0025] (1) Heating: Heat the 27SiMn tube blank to 1300°C in a ring furnace for 3 hours to ensure uniform heating of the tube blank;

[0026] (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;

[0027] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing temperature to 7...

Embodiment 2

[0045]Taking the preparation of a 27SiMn steel pipe with a diameter of 132.9mm and a hole wall thickness of 7.29mm as an example, the following steps are included:

[0046] (1) Heating: Heat the 27SiMn tube blank to 1320°C in a ring furnace for 5 hours to ensure uniform heating of the tube blank;

[0047] (2) Perforation: The heat pipe billet is pierced by a piercer, and the temperature of the capillary tube formed after piercing is controlled at 1280°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;

[0048] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing temperature to 720°C and the annealing time to 60 minute...

Embodiment 3

[0063] Taking the preparation of a 27SiMn steel pipe with a diameter of 157.4mm and a hole wall thickness of 7.92mm as an example, the following steps are included:

[0064] (1) Heating: Heat the 27SiMn tube blank to 1310°C in a ring furnace for 4 hours to ensure uniform heating of the tube blank;

[0065] (2) Perforation: The heat pipe billet is pierced by a piercer, and the temperature of the capillary tube formed after piercing is controlled at 1260°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;

[0066] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing temperature to 710°C and the annealing time to 55 minut...

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Abstract

The invention relates to a production method of a cold-drawn fine-bored roller tube. The production method includes heating a tube blank in a circular furnace; punching a heat tube by the aid of a puncher; subjecting the tube blank to annealing; spraying the tube blank with sodium borate to remove oxide skin; leading the annealed tube blank into a tube mill for hot milling; tensioning the milled tube after tandem milling by a tensioning machine for sizing; performing stress relieving, to be specific, heating the milled tube in a heating furnace to obtain an annealed tube blank; performing acid dipping on the tube blank to remove scale of the surface; subjecting the tube blank to parkerizing, and accordingly a chemical coating of zinc phosphate is generated on the surface of the tube blank; performing saponification to form lubricating coatings such as metallic soap; subjecting the tube blank to be cold drawn to cold drawing, and the cold-drawn tube is achieved; performing normalizing air cooling; straightening the cold-drawn tube; quenching the cold-drawn tube in an induction furnace; tempering the cold-drawn tube in a box-type furnace; performing fine-boring rolling to obtain the cold-drawn fine-bored rolled tube. The cold-drawn fine-bored rolled tube made in the way is good in comprehensive performance and low-temperature impact toughness, has precise size and smooth surface and is good in oil storage effect.

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-drawn, fine-bored and rolled 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 steel pipe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P23/00
CPCB23P15/00F16L9/02
Inventor 支向军
Owner WUXI JIANGNAN HIGH PRECISION COLD DRAWN PIPE
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