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Tempering heat treatment process of high-strength steel

A high-strength steel, high-temperature tempering technology, applied in the field of tempering heat treatment process, can solve the problems of unreachable low-temperature impact, difficulty in balancing strength and toughness, poor repeatability and reproducibility of low-temperature impact toughness, etc. High and low temperature impact toughness, excellent comprehensive mechanical properties at room temperature, and the effect of improving comprehensive mechanical properties

Active Publication Date: 2014-07-02
KOCEL STEEL
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Problems solved by technology

[0002] General high-strength cast steel materials have high strength and poor toughness, especially under low temperature working conditions, the tendency of brittle fracture of the material will increase, and it is difficult to maintain the balance of strength and toughness at this time
At present, the repeatability and reproducibility of low temperature impact toughness of materials during heat treatment is very poor
In the early production process, there are often situations where the strength and impact properties cannot be satisfied at the same time. When the strength can meet the requirements, the low-temperature impact cannot meet the performance requirements, or when the low-temperature impact can meet the requirements, the strength is lower than the performance indicators. requirements, and the material -20°C impact and -40°C impact results are unstable, which greatly prolongs the test cycle, increases the cost of manufacturing, and restricts the development of enterprises
[0003] So far there is no way to overcome the above

Method used

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Embodiment Construction

[0020] A tempering heat treatment process for high-strength steel. The process includes the following steps: a. Heating the material to 850°C to 920°C to austenitize it, and after holding it for 3 to 5 hours, cool it to room temperature and anneal it in a furnace to achieve uniform structure b. Heating the material to 850°C-920°C for austenitization, and then water quenching to 200°C-260°C after holding for 3-5 hours; After heat preservation at 630°C, 650°C, and 670°C for 2 to 5 hours, high temperature tempering is carried out. This method achieves the high strength and low temperature impact performance requirements of the material through "annealing + quenching water cooling + high temperature tempering air cooling". The chemical composition of the material is C%: 0.25-0.32, Si%: 0.60-0.90, Mn%: 0.90-1.10, P%≤0.04, S%≤0.045, Cr%: 0.40-0.80, Mo%: 0.15- 0.35, Ni%: 0.4-0.8. The phase transition temperature of the material is 841°C for AC3 and 726°C for AC1. The best temperin...

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Abstract

The invention relates to a tempering heat treatment process and in particular relates to a tempering heat treatment process of high-strength steel. The process comprises the following steps: heating a material to 850-920 DEG C to be austenitized and furnace-cooling the material to the room temperature to be annealed after insulating the material for 3-5 hours to achieve the aim of tissue homogenization; heating the material to 850-920 DEG C to be austenitized and water-quenching the material to 200-260 DEG C after insulating the material for 3-5 hours; carrying out high-temperature tempering after insulating the quenched material for 2-5 hours at 590 DEG C, 610 DEG C, 630 DEG C, 650 DEG C and 670 DEG C respectively. The process has the effects that the method is unique; by controlling and adjusting the tempering and insulating temperatures, the impacts of the tempering heat treatment process on the low-temperature impact property of the high-strength steel are determined, the best tempering process parameters including the material strength and tenacity up to the standard are obtained and the comprehensive properties of the material used in the low-temperature environments are ensured to meet the requirements.

Description

technical field [0001] The invention relates to a tempering heat treatment process, in particular to a tempering heat treatment process for high-strength steel. Background technique [0002] General high-strength cast steel materials have high strength and poor toughness, especially under low temperature working conditions, the tendency of brittle fracture of the material will increase, and it is difficult to maintain the balance of strength and toughness at this time. At present, the repeatability and reproducibility of low temperature impact toughness of materials during heat treatment is very poor. In the early production process, there are often situations where the strength and impact properties cannot be satisfied at the same time. When the strength can meet the requirements, the low-temperature impact cannot meet the performance requirements, or when the low-temperature impact can meet the requirements, the strength is lower than the performance indicators. requireme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D6/00C22C38/44C22C38/60
Inventor 杨爱宁曹鹏唐钟雪胡进林张宏凯马进
Owner KOCEL STEEL
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