Manufacturing method of hot-rolled high-precision petroleum pipe

A manufacturing method and high-precision technology, applied in the field of steel pipe preparation, can solve the problems of seamless steel pipes relying on imports, yield strength, and dimensional deviation that cannot meet the use requirements, and restrict the development of cold-rolled steel pipes, etc., to achieve high rotational deformation resistance and wear resistance Good toughness, low temperature impact toughness, prolonging the effect of service life

Inactive Publication Date: 2015-07-08
WUXI OULONG SPECIAL STEEL 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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  • Manufacturing method of hot-rolled high-precision petroleum pipe

Examples

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Comparison scheme
Effect test

Embodiment 1

[0025] Taking the preparation of a 27SiMn steel pipe with a diameter of 159.3mm and a hole wall thickness of 6.3mm as an example, the following steps are included:

[0026] (1) Heating: Heat the 27SiMn tube billet to 1200°C in a ring furnace for 3 hours to ensure uniform heating of the tube billet;

[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 1100°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 500°C and the annealing time to 50 minu...

Embodiment 2

[0047] 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:

[0048] (1) Heating: Heat the 27SiMn tube blank to 1280°C in a ring furnace for 4 hours to ensure uniform heating of the tube blank;

[0049] (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;

[0050] (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 60 minute...

Embodiment 3

[0066] 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:

[0067] (1) Heating: Heat the 27SiMn tube billet to 1240°C in a ring furnace for 3.5 hours to ensure uniform heating of the tube billet;

[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 1120°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 temperatu...

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Abstract

The invention relates to a manufacturing method of a hot-rolled high-precision petroleum pipe. The manufacturing method comprises the following steps: heating: a pipe blank is heated in an annular furnace; perforation: the heated pipe blank is perforated by a perforator; annealing: the pipe blank is annealed; spraying of boron sand: oxide scales are removed; hot rolling: the annealed pipe blank is led into a pipe rolling machine for hot rolling; sizing: the rolled pipe formed by continuous rolling is sized by a sizing machine; stress relief annealing: the rolled pipe is led into a heating furnace for heating so that the annealed pipe blank is obtained; acid washing: rust scales on the surface are removed; parkerizing: a chemical coating film of zinc phosphate is formed on the surface; saponification: such lubricating coating films as a metallic soap are formed; cold rolling: the pipe blank to be cold rolled is cold rolled to obtain a cold-rolled pipe; heat treatment: residual stress is reduced; pre-straightening: the residual stress is reduced; quenching in an induction furnace; tempering in a chamber furnace; honing; hot straightening; and obtaining of the high-precision steel pipe. The method is used for manufacturing the high-precision steel pipe with high yield strength and size precision.

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 hot-rolled high-precision oil 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 pipes fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 沈惠民袁冰
Owner WUXI OULONG SPECIAL STEEL PIPE
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