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High-performance low-carbon Mo-containing bainite steel and preparation method thereof

A bainitic steel, high-performance technology, applied in the field of high-performance low-carbon Mo-containing bainitic steel and its preparation, can solve the problems of complex addition of alloying elements, unsuitability for large-scale industrial production, and increased production costs, etc., to achieve Effects of shortened transition time, high strength, and short production cycle

Inactive Publication Date: 2014-09-03
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of alloying elements is complicated, and the production adopts TMCP+RPC process, that is, thermomechanical control process + relaxation precipitation control phase transformation technology, and tempering after cooling. The production process is complex, the production cycle is long, and the production cost is increased.
[0006] It can be seen from the above analysis that most of the existing low-carbon bainite steels are added with various alloying elements, which greatly increases the production cost, and the production process is generally relatively Complex, long production cycle, not suitable for large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A high-performance low-carbon Mo-containing bainite steel and a preparation method thereof. Mo is added to the smelting composition of Fe-C-Mn-Si low-carbon steel, cast into billets after vacuum smelting, and rolled into plates. Heat the rolled plate to 880-900°C at a heating rate of 5-10°C / s, and keep it warm for 10-20 minutes; water cool it to 410-420°C, then air cool it to 340-350°C, keep it warm for 30-40 minutes; water cooling to room temperature to produce high-performance low-carbon Mo-containing bainite steel.

[0017] The chemical composition and content of the high-performance low-carbon Mo-containing bainite steel are: C is 0.15-0.22 wt%; Si is 1.48-1.55 wt%; Mn is 1.95-2.04 wt%; Mo is 0.14-0.15 wt%. wt%; P<0.008 wt%; S<0.002 wt%; N<0.004 wt%; the rest is Fe and unavoidable impurities.

[0018] The main properties of the high-performance low-carbon Mo-containing bainite steel prepared in this embodiment are: the yield strength is 998-1034 MPa; the tensile s...

Embodiment 2

[0020] A high-performance low-carbon Mo-containing bainite steel and a preparation method thereof. Mo is added to the smelting composition of Fe-C-Mn-Si low-carbon steel, cast into billets after vacuum smelting, and rolled into plates. Heat the rolled plate to 900-920°C at a heating rate of 5-10°C / s, and keep it warm for 10-20 minutes; water cool it to 420-430°C, then air cool it to 350-360°C, keep it warm for 30-40 minutes; water cooling to room temperature to produce high-performance low-carbon Mo-containing bainite steel.

[0021] The chemical composition and content of the high-performance low-carbon Mo-containing bainite steel are: C is 0.15-0.22 wt%; Si is 1.48-1.55 wt%; Mn is 1.95-2.04 wt%; Mo is 0.14-0.15 wt%. wt%; P<0.008 wt%; S<0.002 wt%; N<0.004 wt%; the rest is Fe and unavoidable impurities.

[0022] Various properties of the high-performance low-carbon Mo-containing bainite steel prepared in this embodiment are: the yield strength is 986-1012 MPa; the tensile st...

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Abstract

The invention relates to high-performance low-carbon Mo-containing bainite steel and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps of adding Mo into smelting components of Fe-C-Mn-Si low-carbon steel, smelting in vacuum, casting into a steel billet, and rolling the steel billet into a plate; heating the rolled plate to 880-900 DEG C at the heating speed of 5-10 DEG C / s, and keeping the temperature for 10-20 minutes; cooling to 410-420 DEG C by water, cooling to 340-350 DEG C by air, and keeping the temperature for 30-40 minutes; cooling to room temperature by water to prepare the high-performance low-carbon Mo-containing bainite steel. The high-performance low-carbon Mo-containing bainite steel comprises the following chemical components: 0.15wt%-0.22wt% of C, 1.48wt%-1.55wt% of Si, 1.95wt%-2.04wt% of Mn, 0.14wt%-0.15wt% of Mo, less than 0.008wt% of P, less than 0.002wt% of S, less than 0.004wt% of N and the balance of Fe and inevitable impurities. The preparation method has the characteristics of low cost, short cycle and simple process; the prepared high-performance low-carbon Mo-containing bainite steel is excellent in comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of high-performance low-carbon bainite steel. In particular, it relates to a high-performance low-carbon Mo-containing bainite steel and a preparation method thereof. Background technique [0002] High-performance low-carbon bainitic steel is mainly used in construction machinery, marine facilities, bridges, automobiles, shipbuilding and pressure vessels. With the development of science and technology and economy, the requirements for its strength and toughness are increasing. Most of the existing low-carbon bainitic steels are added with a large amount of alloying elements, such as Nb, Ti, Ni, B, etc., some of which are expensive and increase the production cost; in addition, the production process of the existing low-carbon bainitic steels Most of them adopt relaxation precipitation phase transformation technology or long-time isothermal treatment process. Although these technologies can obtain high-stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D8/02
Inventor 徐光胡海江周明星薛正良杨海林周民张云祥徐耀文
Owner WUHAN UNIV OF SCI & TECH
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