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Method for reducing steel oxidation decarburization and application thereof

A steel and decarburization technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve problems affecting the performance of steel and changes in organizational structure, achieve obvious economic and social benefits, reduce oxidation and decarburization, and avoid The effect of significant changes in tissue

Inactive Publication Date: 2019-10-01
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Oxidative decarburization leads to changes in the structure of steel, which significantly affects the performance of steel

Method used

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  • Method for reducing steel oxidation decarburization and application thereof
  • Method for reducing steel oxidation decarburization and application thereof
  • Method for reducing steel oxidation decarburization and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1——Steel Type 1 Experimental Results

[0033] In this embodiment, steel type 1 is selected for experimentation, and its composition is (mass%): 0.64C, 0.29Si, 1.00Mn, <0.01Al, 0.022P, 0.009S through chemical analysis, and the balance is iron. The size of the experimental sample is 10mm × 10mm × 6mm, the surface is ground to 800# SiC sandpaper and chamfered and chamfered, ultrasonically cleaned in acetone and then dried for later use. Oxidation experiments were performed using a Thermax 700 thermogravimetric analyzer (with an accuracy of 0.3 μg). This embodiment adopts three kinds of simulated oxidizing atmospheres, and the oxygen partial pressures (oxygen volume concentration in ambient atmosphere) of atmospheres 1, 2 and 3 are respectively controlled below 21%, 4% and 0.1%. Oxygen partial pressure in hot rolling furnace atmosphere.

[0034] As shown in Figure 1(a), curves 1, 2, and 3 are the oxidation kinetics curves of steel type 1 in atmospheres 1, 2, an...

Embodiment 2

[0041] Embodiment 2——steel type 2 experimental results

[0042] For further validation, the effect of atmosphere control on the oxidation decarburization of steel grade 2 was studied. The chemical analysis of steel type 2 is (mass%): 0.44C, 0.23Si, 0.75Mn, 0.022P, 0.005S, and the balance is iron. The sample size, surface grinding treatment, cleaning method and oxidation test are the same as steel type 1. This embodiment also adopts the three control atmospheres in Embodiment 1.

[0043] As shown in Figure 7(a), curves 1, 2 and 3 are the oxidation kinetics curves of steel type 2 in atmospheres 1, 2 and 3 at a constant temperature of 1250 °C for 2 h, and the oxidation weight gain rate of the steel decreases significantly in turn, And like steel type 1, curve 3 also has some slight oxidation weight loss phenomenon. As shown in Figure 7(b), curve 3 is enlarged, and the oxidation weight loss is more clearly visible. However, compared with steel type 1, although the cooling proce...

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Abstract

The invention relates to the field of high-temperature oxidation and protection and the metallurgical industry, in particular to a method for reducing steel oxidation decarburization by regulating andcontrolling atmosphere, and application of the method. According to the method, the oxide scale of carbon steel is densified through the atmosphere regulation and control technology, so that the structural change caused by oxidation decarburization of a steel substrate under the oxide scale is greatly avoided, and the hot rolling quality of the steel is remarkably improved. By adopting the method, the oxidation decarburization of the steel is remarkably reduced, and the structural change of the steel caused by decarburization is avoided. The atmosphere regulation and control optimization technology is simple in process, low in investment cost and high in generalizability, and provides a new way for reducing oxidation decarburization and improving the hot rolling quality of steel in the metallurgical industry.

Description

technical field [0001] The invention relates to the field of high-temperature oxidation and protection and the metallurgical industry, in particular to a method and application for reducing oxidation and decarburization of iron and steel by regulating the atmosphere. Background technique [0002] Oxidative decarburization in the heating furnace during billet hot-rolling is an important reason for the reduction of billet quality, especially for high-carbon steel. Oxidative decarburization leads to changes in the structure of steel, which significantly affects the performance of steel. Contents of the invention [0003] The object of the present invention is to provide a method and application for reducing oxidation and decarburization of iron and steel by adjusting the atmosphere. By adjusting and optimizing the ambient atmosphere, the carbon steel has a slower oxidation rate in the oxidizing atmosphere, so that the thermally grown oxide scale The conversion from non-dense...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/74C21D11/00C22C38/02C22C38/04
CPCC21D1/74C21D11/00C22C38/002C22C38/02C22C38/04
Inventor 彭晓
Owner NANCHANG HANGKONG UNIVERSITY
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