Production method of cold-drawn high-precision seamless steel tube

A technology of seamless steel pipes and manufacturing methods, applied in the direction of manufacturing tools, metal rolling, other manufacturing equipment/tools, etc., can solve the problem that the yield strength and dimensional deviation cannot meet the use requirements, seamless steel pipes rely on imports, and restrict cold-rolled steel pipes Development and other issues, to achieve high rotation deformation resistance and wear resistance, low temperature impact toughness, and prolong the effect of service life

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 high-precision seamless steel tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0026] (1) Heating: The 27SiMn tube blank is heated to 1200°C in a ring furnace, and the heating time is 3 hours, so as to ensure that the tube blank is heated evenly;

[0027] (2) Perforation: The heat pipe blank is perforated by a perforating machine, the temperature of the capillary formed after perforation is controlled at 1100 ° C, and the eccentricity of the perforation is visually controlled to be 4%, and the pipe blank is visually inspected to remove the surface of the pipe blank. Warped skin, if there are obvious pits, rolling wounds and cracks on the surface of the tube blank, it should be removed to avoid flowing into the next process to control the surface quality of the tube blank;

[0028] (3), annealing: the tube blank is introduced into a continuous annealing furnace for annealing, and the annealing...

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: The 27SiMn tube blank is heated to 1280°C in a ring furnace, and the heating time is 4 hours, so as to ensure that the tube blank is heated evenly;

[0049] (2) Perforation: The heat pipe blank is perforated by a punching machine, the temperature of the capillary formed after perforation is controlled at 1150 ° C, and the eccentricity of the perforation is controlled to be 4%, and the pipe blank is visually inspected to remove the surface of the pipe blank. Warped skin, if there are obvious pits, rolling wounds and cracks on the surface of the tube blank, it should be removed to avoid flowing into the next process to control the surface quality of the tube blank;

[0050] (3), annealing: the tube blank is introduced into a continuous annealing furnace for annealing, and the annealing temperatur...

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: The 27SiMn tube blank is heated to 1240°C in a ring furnace, and the heating time is 3.5 hours, so as to ensure that the tube blank is heated evenly;

[0068] (2) Perforation: The heat pipe blank is perforated by a perforating machine, the temperature of the capillary formed after perforation is controlled at 1120 ° C, and the eccentricity of the perforation is controlled to be 4%, and the pipe blank is visually inspected to remove the surface of the pipe blank. Warped skin, if there are obvious pits, rolling wounds and cracks on the surface of the tube blank, it should be removed to avoid flowing into the next process to control the surface quality of the tube blank;

[0069] (3), annealing: the tube blank is introduced into a continuous annealing furnace for annealing, and the annealing tempe...

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Abstract

The invention relates to a production method of a cold-drawn high-precision seamless steel 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; heating the cold-drawn tube to decrease residual stress; pre-straightening the cold-drawn tube to further decrease the residual stress; quenching the cold-drawn tube in an induction furnace; tempering the cold-drawn tube in a box-type furnace; honing the cold-drawn tube; subjecting the cold-drawn tube to heat straightening. In this way, the high-precision steel tube is obtained and high in yield strength 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-precision seamless steel pipe. Background technique [0002] As a cold working method of a steel pipe for machine structures such as carbon steel, alloy steel, or stainless steel, a drawing method by a drawing machine and a rolling method by a Pilgrim rolling mill are known. Among them, the drawing method by a drawing machine can produce cold-worked steel pipes more efficiently than the rolling method by a pilger mill. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P23/00
CPCB21C37/06B21B19/04
Inventor 支向军
Owner WUXI JIANGNAN HIGH PRECISION COLD DRAWN PIPE
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