High-tenacity low-alloy high-strength steel and quenched-tempered heat treatment method thereof

A low-alloy, high-strength, quenched and tempered heat treatment technology, applied in the field of low-alloy high-strength steel, can solve the problems that affect the safety of high-strength steel, high yield ratio, and no key consideration of yield ratio, etc., to achieve easy implementation, low yield Stronger than, less time-saving effect

Active Publication Date: 2013-06-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

[0010] The strength and toughness of the low-alloy high-strength steel disclosed in the above patents cannot be achieved at the same time. At the same time, the yield ratio is not

Method used

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  • High-tenacity low-alloy high-strength steel and quenched-tempered heat treatment method thereof
  • High-tenacity low-alloy high-strength steel and quenched-tempered heat treatment method thereof
  • High-tenacity low-alloy high-strength steel and quenched-tempered heat treatment method thereof

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Embodiment Construction

[0026] The following examples will further illustrate the present invention, but do not limit the present invention thereby.

[0027] The low-alloy high-strength steel ingot smelted in the embodiment of the present invention is first forged at about 1100°C to ensure that the final forging temperature is not lower than 800°C, and then hot-rolled. The hot-rolling temperature is about 1100°C, and the thickness is rolled by 35mm. to about 12mm. Air cooling is used for normalizing, and oil quenching is used for quenching. At this time, care should be taken to prevent the oil temperature from rising too fast, which will affect the quenching effect. After the final tempering treatment, water cooling must be carried out to prevent temper brittleness.

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Abstract

The invention provides high-tenacity low-alloy high-strength steel and a quenched-tempered heat treatment method of the steel. Chemical components of the low-alloy high-strength steel comprise, by mass, 0.23% to 0.35% of C, 0.20% to 0.35% of Si, 1.0% to 4.0% of Ni, 0.8% to 1.2% of Cr, 0.4% to 1.0% of Mn, 0.4% to 1.0% of Mo, 0.01% to 0.12% of V, <=0.010% of S, <=0.010% of P, and the balance Fe. The quenched-tempered heat treatment method comprises the following steps: the steel is normalized under the temperature of 850 DEG C to 900 DEG C, then the steel is quenched under the temperature of 830 DEG C to 920 DEG C so as to form martensite, at last, tempering treatment is conducted on the martensite under the temperature between 590 DEG C and 660 DEG C so as to obtain a tempered martensite structure. The low-alloy high-strength steel after quenched-tempered treatment can satisfy the requirements of the low-alloy high-strength steel to the comprehensive performance such as tenacity, yield ratio, low temperature impact toughness and elongation.

Description

technical field [0001] The present invention relates to low-alloy high-strength steel, and specifically provides a low-alloy high-strength steel with high toughness at low temperature and a heat treatment method thereof. Tempered sorbite is obtained by adjusting the alloy composition and undergoing appropriate quenching and tempering treatment. Microstructure, on the basis of ensuring the high strength of steel, high low temperature impact toughness can be obtained. Background technique [0002] With the development of society and the progress of science and technology, steel has been used in various fields of society. At the same time, people have put forward higher requirements for the quality of steel. Low-alloy high-strength steel, because of its high strength, good plasticity and toughness, has been widely used in defense fields such as aerospace and ships, and it is also used in other civil fields such as pressure vessels, fire protection, medical treatment, petroleum ...

Claims

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Application Information

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IPC IPC(8): C22C38/46C21D1/25C21D6/00
Inventor 胡小锋闫德胜戎利建赵明久
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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