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A kind of high-temperature ablation-resistant low-carbon medium-low alloy steel and preparation method thereof

A low-alloy steel and anti-ablation technology, which is applied in the field of alloy steel, can solve the problems of reducing the mechanical properties of alloy steel components, reducing the service life, and the shape and structure of components cannot meet the requirements of use, so as to improve high-temperature anti-ablation performance and low cost , the effect of excellent strength and toughness

Active Publication Date: 2021-11-02
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The burning of alloy steel will produce obvious ablation pits. The appearance of ablation pits will greatly reduce the mechanical properties of alloy steel components, resulting in reduced service life. Second, the shape and structure of components cannot meet the requirements of use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing high-temperature ablation-resistant low-carbon medium-low alloy steel is prepared according to the following steps:

[0029] (1) Alloy composition design: On the basis of Cr-Mo alloy steel, on the basis of ensuring high room temperature strength and toughness, by reducing the content of flammable alloy elements, increasing the content of non-flammable alloy elements and improving the composition of flammable alloy elements etc. Determine the chemical composition and mass percentage of alloy steel, specifically C: 0.15%, Cr: 3.0%, Mo: 1.0%, Ni: 1.8%, W: 0.4%, V: 0.6%, Nb: 0.04%, and the rest The composition is Fe;

[0030] (2) Smelting: Vacuum ingots are prepared by vacuum melting the above raw materials, purified and smelted by electroslag remelting, protected by argon gas throughout the process, and cooled in a hood after stripping, and the processing time is 27 hours;

[0031] (3) Annealing treatment: heat up to 730°C at a heating rate of 90°C / ...

Embodiment 2

[0043] A method for preparing high-temperature-resistant medium-low-carbon medium-low alloy steel is prepared according to the following steps:

[0044] (1) Alloy composition design: On the basis of Cr-Mo alloy steel, determine the chemical composition and mass percentage of the alloy steel, specifically C: 0.17%, Cr: 2.5%, Mo: 1.4%, Ni: 2.0%, W: 0.2%, V: 0.3%, Nb: 0.08%, and the rest is Fe;

[0045] (2) Melting: Vacuum ingots are prepared by vacuum melting the above raw materials, purified and smelted by electroslag remelting, protected by argon gas throughout the process, and cooled in a hood after stripping, and the processing time is 30 hours;

[0046] (3) Annealing treatment: heat up to 750°C at a heating rate of 100°C / h, keep warm for 15 hours, stop heat preservation, and cool with the furnace until the temperature drops to 400°C, then take out the furnace and air cool;

[0047] (4) Forging: including billet forging and finish forging; billet forging is to heat the stee...

Embodiment 3

[0053] A method for preparing high-temperature-resistant medium-low-carbon medium-low alloy steel is prepared according to the following steps:

[0054] (1) Alloy composition design: On the basis of Cr-Mo alloy steel, determine the chemical composition and mass percentage of the alloy steel, specifically C: 0.19%, Cr: 3.5%, Mo: 0.5%, Ni: 1.6%, W: 0.5%, V: 0.3%, Nb: 0.03%, and the rest is Fe;

[0055] (2) Smelting: Vacuum ingots are prepared by vacuum melting the above raw materials, purified and smelted by electroslag remelting, protected by argon gas throughout the process, and cooled in a hood after stripping, and the processing time is 24 hours;

[0056] (3) Annealing treatment: heat up to 720°C at a heating rate of 60°C / h, hold for 18 hours, stop heat preservation, and cool with the furnace until the temperature drops to 400°C, then leave the furnace for air cooling;

[0057] (4) Forging: including billet forging and precision forging; billet forging is to heat the steel ...

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Abstract

A high-temperature ablation-resistant low-carbon medium-low alloy steel, characterized in that: the chemical composition of the low-carbon medium-low alloy steel is 0<C<0.2% by weight percentage, Cr: 2.5~3.5%, Mo: 0.5% ~1.4%, Ni: 1.6~2.0%, W: 0.2~0.5%, V: 0.3~0.8%, Nb: 0.03~0.08%, and the rest is Fe. The invention improves the ablation resistance of low-carbon medium-low alloy steel by optimizing the alloy elements instead of increasing the alloy content, and has the advantages of low alloy content, low cost, simple and feasible process, and the method of the invention ensures excellent strength and On the basis of toughness, the high temperature ablation resistance of alloy steel is effectively improved. The maximum diameter of the ablation pit is 5mm and the maximum depth is 3mm.

Description

technical field [0001] The invention relates to the technical field of alloy steel, in particular to a high-temperature ablation-resistant low-carbon medium-low alloy steel and a preparation method thereof. Background technique [0002] Quenched and tempered Cr-Mo alloy steel is a widely used structural material due to its excellent room temperature toughness, low temperature impact toughness, and comprehensive mechanical properties, and is widely used in machinery or equipment. In addition, Cr-Mo alloy steel also has good high-temperature performance, and has been widely used in hot-end parts of power systems. However, under high temperature, high oxygen content, mechanical friction and impact and other environments and conditions, alloy steel will undergo a phenomenon different from oxidation and high temperature melting, but similar to violent combustion of wood and nylon. That is, the metal burns. Combustion of alloy steel will produce obvious ablation pits. The appear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C38/46C22C38/48C21D1/26C21D1/18C21D8/00
CPCC21D1/18C21D1/26C21D8/005C22C38/44C22C38/46C22C38/48
Inventor 李忠盛陈汉宾吴护林宋阳曦沈蕾芳车路长张隆平杨九州李立
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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