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Method for preparing manganese chilled bainitic steel

A bainitic steel and manganese-based technology, applied in the field of alloy steel, can solve problems such as failure to achieve quenching to improve microstructure and mechanical properties, failure to properly solve problems such as quenching deformation and cracking

Inactive Publication Date: 2010-02-24
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] On September 27, 2008, the applicant filed a patent application for "a method for preparing manganese-based water-quenched bainite steel", disclosing a production process for water (oil) quenched bainite steel, but This process failed to properly solve the deformation and cracking problems during quenching, and did not achieve the goal of quenching to improve the structure and mechanical properties

Method used

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  • Method for preparing manganese chilled bainitic steel

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preparation example Construction

[0024] The preparation method of the manganese series quenched bainite steel proposed by the present invention, after smelting with the conventional steelmaking process, the weight percentage of each component in the steel can be:

[0025] C: 0.06-0.54%

[0026] Mn: 1.80-3.50%

[0027] Si: 0.20-1.80%

[0028] Cr: 0-1.60%

[0029] Mo: 0-3.00%

[0030] W: 0-3.00%

[0031] Ni: 0-3.00%

[0032] Ti: 0-0.12%

[0033] V: 0-0.12%

[0034] Nb: 0-0.12%

[0035] N 0-0.02%

[0036] B: 0-0.01%

[0037] The remainder is Fe;

[0038] Forging, rolling or casting the above steel into products, air cooling to 480°C-700°C, then water cooling or oil cooling or saline cooling to 200°C-250°C (or reheating to 30°C above the austenite transformation critical point -50°C, air cooling to 480°C-700°C, then water cooling or oil cooling or saline solution cooling to 200°C-250°C), then take out air cooling or slowly cool to room temperature; heat the above products to 200°C-600°C , keep warm fo...

Embodiment 1

[0041] The preparation method of embodiment 1 is as follows:

[0042] (1) Carry out conventional steelmaking with a converter or an electric furnace, after forging, rolling or casting, air-cool to 480°C, then water-cool to 250°C, and then air-cool to room temperature;

[0043] (2) Heat the above product to 200°C, keep it warm for 5 hours and carry out tempering treatment.

Embodiment 2

[0044] The preparation method of embodiment 2 is as follows:

[0045] (1) Carry out conventional steelmaking with a converter or an electric furnace, after forging, rolling or casting, air-cool to 500°C, then water-cool to 250°C, and then air-cool to room temperature;

[0046] (2) Heat the above product to 350°C, keep it warm for 3 hours and carry out tempering treatment.

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Abstract

The invention relates to a method for preparing manganese chilled bainitic steel, belonging to the field of alloy steel. Firstly, after smelted by the normal steelmaking process, steel is forged, rolled or cast into a product, the product is air-cooled to 480 to 700 DEG C, is processed by water-cooling or oil cooling or salt-alkali solution cooling until 200 to 250 DEG C (or the product is reheated to a temperature of 30 to 50 DEG C higher than the austenitic transformation critical point, is air-cooled to 480 to 700 DEG C and then is processed by water-cooling or oil cooling or salt-alkali solution cooling until 200 to 250 DEG C), and then is taken out to be air-cooled or slowly cooled to room temperature; and the product is heated to 200 to 600 DEG C and then is tempered after the temperature is preserved for 1 to 5 hours. Compared with other types of steel with the same strength, the manganese chilled bainitic steel of the invention has the advantages of low alloy cost, increased performance and no complex working procedure in the whole production technology, thereby obviously reducing the production cost.

Description

technical field [0001] The invention relates to a preparation method of manganese-based quenched bainite steel, which belongs to the field of alloy steel. Background technique [0002] In order to obtain high-strength alloy steel with excellent performance, usually in addition to adding a certain amount of elements or precious elements, it is necessary to heat the product components or parts to the critical point Ac 3 Above 30-50°C, followed by quenching in water or other media, the quenching temperature is generally around 900°C. For this reason, it is inevitable to cause deformation and cracking due to thermal stress and phase transformation stress during cooling. [0003] In view of the above status quo, the applicant proposed this application project, that is, a patent application for "a preparation method of manganese-based quenched bainite steel", in order to solve the problem of cracking and deformation of bainite steel during quenching, and make the quenched bainite...

Claims

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Application Information

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IPC IPC(8): C21D8/00C21D1/18C21D11/00C22C38/58C22C38/38C22C38/14C22C38/12C22C38/08C22C38/04
Inventor 方鸿生张寒许峰云冯春成小乐许磊罗开双郑燕康白秉哲
Owner TSINGHUA UNIV
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