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Preparation method of Bainitic steel

A technology of bainitic steel and cooling method, applied in the field of metal materials, can solve the problems of large fluctuation range of strength and unstable strength of low-carbon bainitic steel, and achieve the effect of good strength stability and stable strength index.

Active Publication Date: 2014-11-12
益阳市科技成果转化服务中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The low-carbon bainite steel of this patent obtains a mixed structure of lower bainite and martensite by adjusting the content of alloy elements Cr, Mn and Si, and at the same time adopting the method of heat treatment using the waste heat during casting of the workpiece, but The strength of the low-carbon bainitic steel is unstable, and the strength fluctuates in a large range

Method used

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  • Preparation method of Bainitic steel
  • Preparation method of Bainitic steel
  • Preparation method of Bainitic steel

Examples

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preparation example Construction

[0053] The present invention also provides a kind of preparation method of bainite steel, comprises the following steps:

[0054] a), casting an ingot with the following composition:

[0055] 0.1wt%-0.3wt% C, 1.5wt%-3.0wt% Mn, 1.0wt%-2.0wt% Si, 0.003wt%-0.006wt% B, 0.05wt%-0.15wt% Ti, Greater than zero and less than or equal to 1.0wt% of Cr, greater than zero and less than or equal to 0.03wt% of RE, 0-0.01wt% of S, 0-0.01wt% of P and the balance of Fe;

[0056] b), heat-treating the ingot, specifically:

[0057] b01), heating to 900℃~1000℃ for pre-normalizing treatment;

[0058] b02), heating the ingot obtained in step b01) to 900°C to 950°C for secondary normalizing;

[0059] b03), heating the ingot obtained in step b02) to 200° C. to 250° C. for tempering treatment to obtain bainite steel.

[0060] Step a) is a casting process, and the present invention has no special limitation on the casting method described in step a), which can be sand casting or metal casting and ot...

Embodiment 1

[0070] (1) prepare an ingot, and the ingot composition is listed in Table 1;

[0071] (2) heating the ingot obtained in step (1) to 900° C. for 60 minutes and then air cooling;

[0072] (3) reheating the ingot obtained in step (2) to 900° C. for 30 minutes and air cooling;

[0073] (4) Reheating the cast ingot obtained in step (3) to 200° C. for 90 minutes to obtain bainite steel.

[0074] The bainite steel prepared according to the above method was tested for hardness, and the results are shown in Table 2.

Embodiment 2

[0076] (1) prepare an ingot, and the ingot composition is listed in Table 1;

[0077] (2) heating the ingot obtained in step (1) to 1000° C. for 120 minutes and air cooling;

[0078] (3) reheating the ingot obtained in step (2) to 950° C. for 60 minutes and then air cooling;

[0079] (4) Reheat the ingot obtained in step (3) to 250° C. for 120 minutes to obtain bainite steel.

[0080] The bainite steel prepared according to the above method was tested for hardness, and the results are shown in Table 2.

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Abstract

The invention provides a bainitic steel. The bainitic steel comprises the following components: C 0.1 wt%-0.3 wt%, Mn 1.5 wt%-3.0 wt%, Si 1.0 wt%-2.0 wt%, B 0.003 wt%-0.006 wt%, Ti 0.05 wt%-0.15 wt%, Cr greater than 0 and less than or equal to 1.0 wt%, RE greater than 0 and less than or equal to 0.03 wt%, S 0-0.01 wt%, P 0-0.01 wt% and the balance of Fe. The invention also provides a preparation method of the bainitic steel. As the bainitic steel provided by the invention is added with alloy elements, such as the Mn, the Si, the Cr and the B, and a heat treatment process is adjusted, intensity stability of the bainitic steel is improved, and service life of the bainitic steel under a frictional and abrasive working condition is prolonged.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a bainite steel and a preparation method thereof. Background technique [0002] Since E.C. Bain first discovered bainite transformation in steel at the end of the 1920s, the research on bainite theory and application has been going on for more than half a century. Domestic scholars have done a lot of research on bainitic transformation and developed a series of bainitic steels. Due to its excellent strength, toughness and wear resistance, bainitic steel has been widely used in metallurgy, electric power, building materials and chemical industries. It is used as wear-resistant steel balls for ball mills, mining machinery scrapers and wear-resistant transmission pipes, etc. The application effect of parts is better. [0003] According to the alloy composition, bainite steel can be divided into Mo-B series bainite steel and Mn-B series bainite steel. Studies have shown that the com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/34C22C38/32C21D1/28C21D1/18
Inventor 孙伟严峻薛会锋
Owner 益阳市科技成果转化服务中心
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