A kind of heat treatment method of low-alloy steel plate and steel plate

A heat treatment method and low-alloy technology, which is applied in the production of medium and thick steel plates, can solve the problems of coarse grains, poor flexibility of water-cooling process, and high cost, so as to reduce the content of carbon and alloy elements, shorten the high-temperature residence time, and improve weldability. performance effect
CN103667912BActive Publication Date: 2015-12-30LAIWU STEEL YINSHAN SECTION CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
LAIWU STEEL YINSHAN SECTION CO LTD
Publication Date
2015-12-30

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Abstract

The invention discloses a low-alloy steel plate and a heat treatment method for the steel plate. The strong-strength low-alloy steel plate comprises the following chemical components in percentage by weight: 0.12 to 0.20 percent of C, 0.20 to 0.60 percent of Si, 1.20 to 1.80 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.030 percent of S, 0.020 to 0.080 percent of Nb, less than or equal to 0.050 percent of V, 0.010 to 0.060 percent of Ti, 0.015 to 0.045 percent of Al and the balance of Fe and trace impurities. According to the low-alloy steel plate and the heat treatment method for the steel plate, the strength loss of the steel plate after heat treatment can be effectively reduced, the yield strength and the tensile strength of the steel plate are strengthened by more than 30MPa compared with those of a conventional normalized steel plate, the alloy element content of the normalized steel plate can be effectively reduced, and the production cost is lowered.
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Description

technical field

[0001] The invention belongs to the field of production of medium and thick steel plates, and mainly relates to a low-alloy steel plate and a heat treatment method for the steel plate. Background technique

[0002] Normalizing steel plates are widely used in pressure vessels, high-rise buildings, bridges, construction machinery and other fields, and play an irreplaceable role. Especially in some wind power and container projects, the use of normalizing steel plates is mandatory in project design.

[0003] The traditional normalizing process is air-cooled after heating, and the cooling speed is slow. The grains of the steel plate grow up at high temperature, and the mechanical properties, especially the strength properties, decrease greatly. The method of increasing the content of carbon elements and alloy elements to ensure the strength performance of the steel plate will lead to deterioration of the welding performance and increase the smelting cost. [000...

Claims

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