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Carbon supplementing method in hot working of steel

A thermal processing, steel technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc.

Active Publication Date: 2013-12-11
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention aims at the problem of decarburization existing in the thermal processing of steel, and provides a method for supplementing carbon in thermal processing of steel

Method used

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  • Carbon supplementing method in hot working of steel
  • Carbon supplementing method in hot working of steel
  • Carbon supplementing method in hot working of steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: Hot-rolled spring flat steel products are produced in a rolling mill, the steel type is: 55SiCr, and the size is: 100×15mm.

[0014] The blank size is: 150×150mm.

[0015] Requirements: No complete decarburization, total decarburization layer: less than 0.2mm for grade 1, less than 0.25mm for grade 2.

[0016] Apply the low-temperature hot rolling process commonly used at present, the heating temperature is 1130°C, the rolling start temperature is 1100°C, the final rolling temperature is 900°C, after 10 passes of rolling, and finally air-cooled. The decarburization of 11 batches of products was sampled and measured, as shown in Table 1:

[0017] Table 1 Decarburization results of common hot rolling process products

[0018]

[0019] It can be seen from Table 1 that there are 7 batches of secondary products and only 4 batches of first-class products.

[0020] Using the thermal processing and cooling method provided by the present invention, the heatin...

Embodiment 2

[0024] Embodiment 2: hot-rolled spring steel and bars are produced in a rolling mill. Product, steel type: 60Si2Mn, size: φ25mm.

[0025] The blank size is: 160×160mm.

[0026] Requirements: No complete decarburization, total decarburization layer: less than 0.5mm for grade 1, less than 0.62mm for grade 2.

[0027] Apply the low-temperature hot rolling process commonly used at present, the heating temperature is 1130°C, the rolling start temperature is 1100°C, the final rolling temperature is 900°C, after 14 passes of rolling, and finally air-cooled. Samples were taken to measure the decarburization of 10 batches of products, as shown in Table 3:

[0028] Table 3 Decarburization results of ordinary hot rolling process products

[0029]

[0030] It can be seen from Table 3 that there are 6 batches of secondary products and 4 batches of first-class products.

[0031] Using the thermal processing and cooling method provided by the present invention, the heating temperature...

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Abstract

The invention discloses a carbon supplementing method in hot working of steel, belonging to the technical field of metal plastic working forming. The method comprises the following main contents: heating a steel billet in a heating furnace to 900-1,250 DEG C and then performing hot working; spraying a carbon-containing material in a final pass of hot working and a plurality of hot working passes; cooling the steel in air rich in protective gas after the final hot working process is finished. According to the method disclosed by the invention, carbon is quickly supplemented to the steel to make up decarbonization during heating and hot working under the combined action of high temperature and deformation machining; meanwhile, the cooling is performed under a protective atmosphere condition. The method has general applicability to the plastic hot working of medium-and-high-carbon steel, such as rolling and forging of the medium-and-high-carbon steel.

Description

Technical field: [0001] The invention belongs to the technical field of metal plastic processing and molding, and in particular relates to a method for replenishing carbon in thermal processing of steel materials. Background technique: [0002] There is decarburization phenomenon in steel during heating and thermal processing, which has little effect on the product quality of general low carbon steel, but for medium and high carbon steel such as spring steel, bearing steel, etc., decarburization will have a significant impact on steel properties. Decarburization is a common surface defect of many medium and high carbon steels. When the steel is decarburized, its surface hardness decreases, and the transition zone between the fully decarburized layer and the partially decarburized layer is prone to microcracks under the action of alternating stress, causing Failure or fracture of spring steel, etc. At present, high fatigue strength and high elastic resistance have become the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/66C23C8/46
Inventor 钱健清董玉庆岳元王涛李震
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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