Hot-rolled high-strength oil pipe manufacturing method

A manufacturing method and oil pipe technology, applied in the field of steel pipe preparation, can solve problems such as yield strength, dimensional deviation that cannot meet the use requirements, seamless steel pipes rely on imports, 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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  • Hot-rolled high-strength oil pipe manufacturing method

Examples

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Effect test

Embodiment 1

[0022] Taking the preparation of a 27SiMn steel pipe with a diameter of 145.3mm and a hole wall thickness of 8.23mm as an example, the following steps are included:

[0023] (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;

[0024] (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;

[0025] (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

[0041] Taking the preparation of a 27SiMn steel pipe with a diameter of 136.9mm and a hole wall thickness of 8.29mm as an example, the following steps are included:

[0042] (1) Heating: Heat the 27SiMn tube blank to 1290°C in a ring furnace for 5 hours to ensure uniform heating of the tube blank;

[0043](2) Perforation: The heat pipe billet is pierced by a piercer, and the temperature of the capillary formed after piercing is controlled at 1230°C, and the perforation eccentricity rate 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;

[0044] (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 90 minute...

Embodiment 3

[0057] Take the preparation of a 27SiMn steel pipe with a diameter of 147.4mm and a hole wall thickness of 8.02mm as an example, including the following steps:

[0058] (1) Heating: Heat the 27SiMn tube billet to 1250°C in a ring furnace for 4.5 hours to ensure uniform heating of the tube billet;

[0059] (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;

[0060] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing temperature t...

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Abstract

The invention relates to a hot-rolled high-strength oil pipe manufacturing method, which comprises the following steps: heating: heating a pipe blank in an annular furnace; punching: punching holes in the heated pipe blank through a puncher; annealing: annealing the pipe blank; spraying borax; removing oxide skin; hot-rolling: feeding the annealed pipe into a pipe mill for hot-rolling; separating the pipe: separating the rolled pipe from a core rod; removing stress and annealing: feeding the rolled pipe into the heating furnace for heating, so as to obtain the annealed pipe blank; pickling: removing rust scale on the surface; phosphating: forming a zinc phosphate chemically-generated covering membrane on the surface; saponifying: forming metal soap and lubrication covering membranes: cold-drawing: cold-drawing the pipe blank to be cold-drawn, so as to obtain a cold-drawn pipe; performing heat treatment: reducing residual stress; honing; and performing hot straightening treatment, so as to obtain a cold-drawn precise inner-hole honed pipe, wherein a numerically-controlled honing machine is adopted in honing. The cold-drawn precise inner hole-honed pipe obtained through the method is good in comprehensive performance, good in low-temperature impact toughness, precise in dimension, smooth in surface, and excellent oil storage property.

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-strength 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 for...

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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