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Manufacturing method of cold-drawn high-strength fine-boring rolled pipe

A manufacturing method and high-strength technology, applied in the field of steel pipe preparation, can solve the problems that seamless steel pipes depend on imports, yield strength, and dimensional deviation cannot meet the requirements for use, and restrict the development of cold-rolled steel pipes, and achieve high tensile strength and improved resistance. Abrasiveness, the effect of improving wear resistance

Inactive Publication Date: 2016-03-02
WUXI SHENLU HYDRAULIC PARTS
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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 cold-drawn high-strength fine-boring rolled pipe
  • Manufacturing method of cold-drawn high-strength fine-boring rolled pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 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:

[0026] (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;

[0027] (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;

[0028] (3) Annealing: introduce the tube blank into a continuous annealing furnace for annealing, and control the annealing temperature to 7...

Embodiment 2

[0048] 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:

[0049] (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;

[0050] (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;

[0051] (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 minut...

Embodiment 3

[0067] 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:

[0068] (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;

[0069] (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;

[0070] (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 manufacturing method of a cold-drawn high-strength fine-boring rolled pipe. The manufacturing method comprises the following steps of heating, wherein a pipe blank is heated in a circular furnace; perforating, wherein the heated pipe blank is perforated by a perforating machine; annealing, wherein the pipe blank is annealed; borax spraying, wherein oxide skin is removed; hot rolling, wherein the annealed pipe blank is guided into a pipe rolling machine for hot rolling; sizing, wherein the rolled pipe formed after continuous rolling is subjected to sizing through a sizing mill; stress relief annealing, wherein the rolled pipe is guided into a heating furnace to be heated to obtain the annealed pipe blank; acid pickling treatment, wherein rust scales on the surface are removed; phosphating treatment, wherein a chemical generation film of zinc phosphate is formed on the surface; saponification treatment, wherein metallic soap and the like are formed to lubricate the film; primary cold-drawing, wherein the pipe blank to be cold-drawn is cold-drawn; secondary cold-drawing, wherein the cold-drawn pipe subjected to primary cold-drawing is subjected to secondary cold-drawing to obtain the cold-drawn pipe; normalizing and air cooling treatment; straightening treatment; induction furnace quenching treatment; and fine-boring rolling. Thus, the fine-boring rolled pipe is obtained. The fine-boring rolled pipe obtained through the method is high in yield strength and tensile strength.

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 high-strength fine-boring and rolling 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 seam...

Claims

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Application Information

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IPC IPC(8): B23P15/00
Inventor 吴建兴
Owner WUXI SHENLU HYDRAULIC PARTS
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