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A method for manufacturing cold-drawn special steel round steel without decarburization layer on the surface

A manufacturing method and decarburization layer technology, which can be used in the manufacture of tools, machine tools designed for grinding the rotating surface of workpieces, metal material coating processes, etc. To avoid corrosion, increase product dimensional accuracy and product qualification rate, and improve productivity

Active Publication Date: 2022-06-21
DAYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention provides a solution to the existing pickling method to remove the surface oxide scale and turning and grinding after drawing to remove the surface decarburization layer, reduce the dimensional accuracy and dimensional dispersion of special steel, and eliminate the finished material. Problems with superficial burns or gnaws

Method used

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  • A method for manufacturing cold-drawn special steel round steel without decarburization layer on the surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Sampling and testing the internal quality of the billet steel (model: GCr15) before cold drawing according to the requirements, its specifications meet the requirements of GB / T18254-2016, and the hardness and the surface decarburization layer are tested. Unqualified special steel round steel billets;

[0043] The testing method of GB / T224 is used to measure the depth of the full decarburized layer of the special steel billet with qualified product quality and hardness, and the decarburized layer on the surface is gradually removed by a coreless grinder or a lathe in one pass or multiple passes, and finally the decarburized layer is completely removed. Carbon layer, and the surface roughness of the steel billet is Ra≤6.3um;

[0044]Put the steel billet after removing the decarburized layer into the alkaline water tank with pH of 12 and temperature of 60℃. powder to ensure subsequent phosphating and saponification treatment;

[0045] Put the alkali-washed steel billet i...

Embodiment 2

[0051] Sampling and testing the internal quality of the billet steel (model: GCr15) before cold drawing according to the requirements, its specifications meet the requirements of GB / T18254-2016, and the hardness and the surface decarburization layer are tested. Unqualified special steel round steel billets;

[0052] The detection method of GB / T224 is used to measure the depth of the full decarburization layer of the special steel billet, and the decarburized layer on the surface is gradually removed by a coreless grinder or a lathe in one pass or multiple passes, and finally the decarburized layer is completely removed, and the steel billet is completely removed. The surface roughness is Ra≤6.3um;

[0053] Put the steel billet after removing the decarburized layer into an alkaline water tank with pH of 11 and a temperature of 70°C. The steel billet should be completely immersed in the alkaline water, and the steel billet should be turned over from time to time to completely re...

Embodiment 3

[0060] Sampling and testing the internal quality of the billet steel (model: GCr15) before cold drawing according to the requirements, its specifications meet the requirements of GB / T18254-2016, and the hardness and the surface decarburization layer are tested. Unqualified special steel round steel billets;

[0061] The detection method of GB / T224 is used to measure the depth of the full decarburization layer of the special steel billet, and the decarburized layer on the surface is gradually removed by a coreless grinder or a lathe in one pass or multiple passes, and finally the decarburized layer is completely removed, and the steel billet is completely removed. The surface roughness is below Ra6.3um;

[0062] Put the steel billet after removing the decarburized layer into an alkaline water tank with pH of 10 and a temperature of 90°C. The steel billet should be completely immersed in the alkaline water, and the steel billet should be turned over from time to time to complete...

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Abstract

The invention discloses a method for manufacturing a cold-drawn special steel round bar without a decarburized layer on the surface, which comprises the following steps: inspecting the steel billet before cold drawing; selecting the steel billet whose quality and hardness are qualified and whose surface is decarburized; and completely grinding away the steel billet The decarburized layer on the surface of the material; the steel billet that removes the decarburized layer by alkali washing, removes surface oil and wear debris; the steel billet after alkali washing is subjected to phosphating, saponification, and drying in sequence; the dried steel billet is rolled Pointing, drawing, and straightening to obtain the cold-drawn special steel round steel without decarburization layer on the surface. The beneficial effects of the present invention are: the present invention sets the grinding of the decarburized layer before the drawing process, can omit the pickling process before cold drawing, and can avoid the dimensional accuracy and size caused by turning or grinding after drawing. To solve the problem of dispersion, the invention simplifies the process, improves the production efficiency, reduces environmental pollution, and increases the product dimensional accuracy and product qualification rate.

Description

technical field [0001] The invention belongs to the technical field of mechanical manufacturing, and particularly relates to a method for manufacturing a cold-drawn special steel round bar without a decarburized layer on the surface. Background technique [0002] When the steel is hot processed or heat treated, all or part of the carbon is lost in the matrix of the steel surface after the action of the oxidizing atmosphere in the furnace at a certain temperature, resulting in less carbon content on the surface of the steel than in the interior, forming a fully decarburized layer and partial carbon. Decarburized layer. The microstructure of the fully decarburized layer and the partially decarburized layer is different from the matrix structure. Surface decarburization is a common surface defect of steel, which will lead to different surface and internal properties of steel, thereby reducing the fatigue life of steel. If cold-drawn bearing steel round steel is directly proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/04B21C1/16B21C5/00B24B5/22B24B27/033C21D1/30C21D1/74C23C22/73C23G1/19
CPCB21C37/04B21C1/16B21C5/006C23G1/19C23C22/73C21D1/30C21D1/74B24B5/22B24B27/033
Inventor 肖爱平鲁强李博鹏
Owner DAYE SPECIAL STEEL CO LTD
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