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A cold extrusion process for steel

A cold extrusion and process technology, applied in the field of cold extrusion treatment, can solve the problems of low steel strength, poor uniformity of steel pipe material, and irremovable residual stress of steel, and achieve the effect of uniform texture and less residual stress

Active Publication Date: 2016-06-01
山东华创融盛展示有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the material uniformity of the steel pipe after cold extrusion in the prior art is poor, resulting in that the residual stress in the steel cannot be removed, and the steel strength is low; furthermore, a steel with uniform texture, less residual stress and high strength is proposed steel cold extrusion process

Method used

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  • A cold extrusion process for steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The steel cold extrusion process of the present invention includes,

[0026] (1) sawing low-alloy steel into blanks;

[0027] (2) Place the blank in a high-temperature electric furnace for annealing treatment, heat it to 950-1000° C. for 9 hours, drop it to 650-700° C. for 6-7 hours, then keep it for 9-10 hours, and then cool it naturally to room temperature;

[0028] (3) machining the surface of the billet after the annealing treatment;

[0029] (4) degreasing, phosphating, saponifying the machined blank, and cleaning;

[0030] (5) After the billet after cleaning is placed in the mold sheath and sealed, adopt a hydraulic press to carry out cold extrusion, the pressure is 150MPa, and the cold extrusion time is 1h;

[0031] (6) Take out the sealed mold package containing the blank, place it in hot isostatic pressing, the pressure is 100-150 MPa, the temperature is 750-900 ° C, and the processing time is 30 minutes to obtain a semi-finished product;

[0032] (7) Take t...

Embodiment 2

[0039] The steel cold extrusion process of the present invention includes,

[0040] (1) sawing low-alloy steel into blanks;

[0041] (2) Place the blank in a high-temperature electric furnace for annealing treatment, heat it to 950-1000° C. for 6 hours, drop it to 700-800° C. for 4-5 hours, then hold it for 9-15 hours, and then cool it naturally to room temperature;

[0042] (3) machining the surface of the billet after the annealing treatment;

[0043] (4) degreasing, phosphating, saponifying the machined blank, and carrying out pickling and neutralization cleaning;

[0044] (5) Put the cleaned billet in the mold sheath and seal it, then use a hydraulic press for cold extrusion, the pressure is 300MPa, and the cold extrusion time is 1h;

[0045] (6) Take out the sealed mold package containing the blank, place it in a hot isostatic pressing process, the pressure is 100-150 °C MPa, the temperature is 750-900 °C, and the treatment time is 30 minutes to obtain a semi-finished p...

Embodiment 3

[0053] The steel cold extrusion process of the present invention includes,

[0054] (1) sawing low-alloy steel into blanks;

[0055] (2) Place the blank in a high-temperature electric furnace for annealing treatment, heat it to 950-1000° C. for 8 hours, drop it to 700-800° C. for 4-5 hours, then keep it for 9-15 hours, and then cool it naturally to room temperature;

[0056] (3) machining the surface of the billet after the annealing treatment;

[0057] (4) degreasing, phosphating, saponifying the machined blank, and carrying out pickling and neutralization cleaning;

[0058] (5) after the billet after cleaning is placed in the mold sheath and sealed, adopt hydraulic press to carry out cold extrusion, the pressure of cold extrusion is 200MPa, and the time of cold extrusion is 1h;

[0059] (6) Take out the sealed mold package containing the blank, place it in hot isostatic pressing, the pressure is 100-150 MPa, the temperature is 750-900 ° C, and the processing time is 30 min...

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Abstract

The invention discloses a steel cold-extrusion process. The steel cold-extrusion process includes the steps of sawing low-alloy steel into blanks and carrying out annealing processing, machining, oil removing, parkerising, saponificatoin, washing, cold-extrusion, hot isostatic pressing, carburizing nitrogen processing, surface homogenization, laser phase-change hardening processing, shot blasting, tempering and finishing turning. The process can be used for manufacturing steel products which are uniform in texture, little in residual stress and high in strength and is suitable for being used for machining steel materials.

Description

technical field [0001] The invention relates to a steel cold extrusion process, which belongs to the technical field of cold extrusion treatment. Background technique [0002] Cold extrusion is a process in which a metal blank is placed in a mold cavity, and at room temperature, a press is applied to the metal blank in the mold cavity to cause the blank to undergo plastic deformation to obtain a component. At present, steel blanks made of low-carbon steel, medium-carbon steel, bearing steel, high-speed steel, low-alloy steel and stainless steel can be processed and formed by cold extrusion. For example, the Chinese patent document CN103173599A discloses a cold extrusion method of high-precision, high-strength steel materials. The hot-rolled low-alloy structural steel pipe is subjected to normalizing treatment, pickling, cleaning and neutralization, phosphating, saponification, cold extrusion and After stress relief treatment and other processes, a steel pipe with significan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 范庆龙
Owner 山东华创融盛展示有限公司