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Preparation of manganese series water quenching bainite steel

A bainitic steel and water quenching technology, applied in the field of alloy steel manufacturing, can solve the problems of low hardenability, high production cost of high-strength alloy steel, complex production process, etc. The effect of reducing production costs

Inactive Publication Date: 2009-03-04
TSINGHUA UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

Due to the addition of a large number of elements or precious elements in alloy steel, or due to the more complicated production process, the production cost of high-strength alloy steel is high, which is not conducive to mass use
When water (oil) quenching is used in the production of large steel components, in some cases, due to the low hardenability of the steel, the overall strength of the component is insufficient. These are technical bottlenecks often encountered in the production of large high-strength alloy steel components.

Method used

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  • Preparation of manganese series water quenching bainite steel
  • Preparation of manganese series water quenching bainite steel

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preparation example Construction

[0019] The preparation method of the manganese series water-quenched bainite steel proposed by the present invention is firstly smelted by a conventional steelmaking process, and then produced by ingot injection or continuous casting. The weight percentage of each component in the steel is:

[0020] C: 0.05—0.42%

[0021] Mn: 1.80—3.00%

[0022] Si: 0.20—1.80%

[0023] Cr: 0—1.60%

[0024] Ti: 0—0.12%

[0025] V: 0—0.12%

[0026] Nb: 0—0.12%

[0027] N 0—0.02%

[0028] B: 0—0.01%

[0029] The remainder is Fe;

[0030] Then the above steel is forged or rolled into products at 1100°C-1250°C, water-cooled or oil-cooled to room temperature-300°C; the above-mentioned products are heated to 200-650°C, kept for 1-3 hours for tempering.

[0031] Embodiment of the present invention sees the following table:

[0032]

[0033]

Embodiment 1

[0034] The preparation method of embodiment 1 is as follows:

[0035] (1) Use a converter or an electric furnace to carry out continuous casting of conventional steelmaking processes to produce blanks.

[0036] (2) Cool the billet to 1200°C and roll it into a Φ300 bar, then oil-cool it to 200°C and then slowly cool it to room temperature.

[0037] (3) Heat the bar to 250°C, keep it warm for 2 hours, and perform tempering treatment.

Embodiment 2

[0038] The preparation method of embodiment 2 is as follows:

[0039] (1) Use a converter or an electric furnace to carry out continuous casting of conventional steelmaking processes to produce blanks.

[0040] (2) Cool the billet to 1200°C and roll it into a Φ300 bar, then oil-cool it to 200°C and then slowly cool it to room temperature.

[0041] (3) Heat the rod to 200°C, keep it warm for 2 hours, and perform tempering treatment.

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Abstract

The invention relates to a preparation method of manganese series water quenching bainitic steel, which belongs to the technical field of alloy steel preparation. First, the steel is smelted by a conventional steel smelting process, teemed or continuously cast and produced; the weight percentage of all components in the steel is as follows: C: 0.05 percent to 0.42 percent, Mn: 1.80 percent to 3.00 percent, Si: 0.20 percent to 1.80 percent, Cr: 0 percent to 1.60 percent, and the rest is Fe; after forge rolling, the steel is directly cooled by water or oil; and then, the steel is heated to 200 DEG C to 650 DEG C, and tempered after the temperature is preserved for 1h to 3h. In the preparation method, the alloying of an appropriate amount of Mn, Si, Cr and other elements changes the continuous cooling conversion curve of the steel grade, improves the hardenability characteristic of the steel and obtains components with good obdurability. The product produced by the preparation method has excellent performance, simple process and low cost.

Description

technical field [0001] The invention relates to a method for preparing manganese-based water-quenched bainite steel, which belongs to the technical field of alloy steel manufacturing. Background technique [0002] For the production of high-strength alloy steel, methods such as adding more elements or precious elements, heat treatment after hot working, etc. are usually used to obtain better strength and toughness of alloy steel products. Due to the addition of a large number of elements or precious elements in the alloy steel, or due to the more complicated production process, the production cost of high-strength alloy steel is relatively high, which is not conducive to mass use. When water (oil) quenching is used in the production of large steel components, in some cases, due to the low hardenability of the steel, the overall strength of the component is insufficient. These are technical bottlenecks often encountered in the production of large high-strength alloy steel com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/00C22C38/38C21D8/00
Inventor 方鸿生张寒许峰云冯春罗开双郑燕康白秉哲
Owner TSINGHUA UNIV
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