Thermal treatment method for improving mechanical performances of normalized steel plate

A heat treatment method and normalizing treatment technology, which is applied in the field of medium and heavy plate steel plate manufacturing, can solve the problems of poor welding adaptability, decreased mechanical performance strength, slow cooling speed, etc., to achieve increased strength, increased tensile strength, and uniformity Improved effect

Active Publication Date: 2008-12-10
SHOUGANG CORPORATION
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Problems solved by technology

Due to the slow cooling rate of this process, the grains of the steel plate grow at high temperature, and the mechanical properties, e

Method used

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  • Thermal treatment method for improving mechanical performances of normalized steel plate

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Embodiment 1

[0016] The heat treatment temperature of the rolled steel plate is 870°C, the heat preservation time is 40 minutes, the water ratio is 1, the roll speed is set at 40m / min, and the measured surface temperature of the steel plate after treatment is 600°C. The comprehensive mechanical properties of the steel plate are shown in Table 1.

Embodiment 2

[0018] The heat treatment temperature of the rolled steel plate is 880°C, the heat preservation time is 30 minutes, the water ratio is 1.01, the roll speed is set at 35m / min, and the measured surface temperature of the steel plate after treatment is 610°C. The comprehensive mechanical properties of the steel plate are shown in Table 1.

Embodiment 3

[0020] The heat treatment temperature of the rolled steel plate is 920°C, the temperature is kept for 5 minutes, the water ratio is 1.71, the roll speed is set at 12m / min, and the measured surface temperature of the steel plate after treatment is 780°C. The comprehensive mechanical properties of the steel plate are shown in Table 1.

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Abstract

The invention discloses a heat treatment method for improving mechanical property of a normalized steel plate, which belongs to the medium and thick steel plate manufacturing technical field. A rolled microalloying steel plate containing niobium is placed into a quenching furnace for conventional normalizing treatment, and is taken out of the furnace after 3 to 40 minutes of heat insulation, the quenching furnace is adopted to perform weak water-cooling treatment to the steel plate, the ratio of water supply and drain at a water outlet of a quenching machine is controlled to between 1 and 1.8, the roll speed is maintained to between 10 and 40m/min, and the measured surface temperature of the steel plate after the weak water-cooling treatment is between 600 and 800 DEG C. The method greatly improves the comprehensive performance of the steel plate compared with the conventional normalizing treatment: the yield strength is improved by between 50 and 80MPa, the tensile strength is improved by between 20 and 30MPa, the low-temperature toughness and the strain aging performance of the steel plate are both improved, the uniformity of the performance in the thickness direction of the steel plate is improved, and the plate shape and the surface quality of the steel plate are good.

Description

[0001] Field [0002] The invention belongs to the technical field of medium-thick steel plate manufacturing, and mainly relates to a heat treatment method for improving the comprehensive mechanical properties of normalized microalloyed steel plates. Background technique [0003] Microalloyed steel is mainly used in many fields such as bridges, boilers, pressure vessels, and ship moorings. Controlled rolling steel plate adopts microalloying, which can effectively improve the strength and toughness of the steel plate, and improve the mechanical properties, but the plate thickness effect is serious. [0004] Microalloyed steel is air-cooled after normalizing, and the uniformity of the steel plate is improved. Due to the slow cooling rate of this process, the grains of the steel plate grow at high temperature, and the mechanical properties, especially the strength, will be greatly reduced. If the carbon equivalent is increased, the welding adaptability will be deteriorated. [...

Claims

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Application Information

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IPC IPC(8): C21D1/28C21D1/18C22C38/12
Inventor 吴斌王彦锋顾林豪张炜星张学峰闫智平杨洪智
Owner SHOUGANG CORPORATION
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