Cooling method for 60-100mm performance-guaranteed thick steel plate after rolling

A cooling method and thick steel plate technology, applied in the direction of metal rolling, metal rolling, workpiece surface treatment equipment, etc., can solve problems such as mixed crystals, coarse grains, and backlog of steel plates, and achieve low requirements for process components and process operations The effect of simplicity and short production process

Inactive Publication Date: 2012-02-08
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thickness of the steel plate continues to increase, and the performance requirements are getting higher and higher. According to the investigation of major domestic steel mills, the production process of the low-alloy high-strength thick plate with a thickness of more than 60 mm is affected by problems such as the size of the continuous casting billet, the capacity of the rolling mill, and the cooling speed of the thick plate. , causing the steel plate to have disadvantages in terms of compression ratio, pass reduction, and cooling rate control. The performance pass rate of the steel plate after rolling is low, generally about 70%, and the microscopic grains are mostly coarse or mixed.
However, if the performance of the steel plate with a thickness of more than 60 mm is unqualified, it needs to be rescued by heat treatment, which affects the production efficiency; it not only increases the production cost of the steel plate, but also causes a backlog of steel plates on-line

Method used

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  • Cooling method for 60-100mm performance-guaranteed thick steel plate after rolling
  • Cooling method for 60-100mm performance-guaranteed thick steel plate after rolling
  • Cooling method for 60-100mm performance-guaranteed thick steel plate after rolling

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Embodiment Construction

[0013] The cooling method of the 60-100mm thick steel plate after rolling of the present invention is to cool the extra-thick steel plate twice. The rapid cooling is used for the first time in the two cooling process, and the surface cooling rate of the steel plate is controlled above 12°C / s. Cooling time is 8~15s; the cooling rate of the second cold steel plate surface is controlled at 4~8℃ / s, and the second cooling time is calculated according to the redness temperature after the first cooling and the steel grade's requirements for the final redness temperature .

[0014] The ultra-thickness of the present invention is 60mm, 80mm, 100mm, low-alloy high-strength Q460C for performance and flaw detection. The steel plate contains the following chemical components (unit, wt%):

[0015] C: 0.08~0.16, Si: 0.20~0.50, Mn: 1.15~1.60, P: ≤0.020, S: ≤0.010, microalloying elements (Nb+V+Ti): ≤0.15, Als: ≤0.050, others are Fe and residual elements.

[0016] Steel rolling process point contro...

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Abstract

The invention relates to a method for producing extra-thick steel plates with thickness greater than 60mm, in particular to a method for accelerated cooling of 60-100mm continuous cast performance-guaranteed steel plates after rolling. In the method, the extra-thick steel plates are cooled twice, wherein in the first cooling process, rapid cooling is adopted, the cooling speed of the surfaces of the steel plates is controlled to be above 12 DEG C per second and the cooling time is 8-15 seconds; and in the second cooling process, the cooling speed of the surfaces of the steel plates is controlled to be 4-8 DEG C per second. The method overcomes the disadvantages of low performance qualification rate of the extra-thick steel plates and high cost in conventional method. With the method, extra-thick steel plates with stable performance can be produced. The method is low in technical process requirement, simple in operation, short in production line and low in energy consumption and is convenient to popularize in large-scale production.

Description

Technical field [0001] In order to achieve the above, the present invention belongs to the technical field of steel rolling, and relates to a method for producing extra-thick steel plates with a thickness greater than 60mm, and specifically relates to a method for accelerated cooling after rolling of a continuous casting slab with a protective thickness of 60-100mm. Background technique [0002] With the rapid development of China's national economy and the continuous increase of super high-rise and long-span steel structure construction projects, the domestic machinery and construction thick plate market has an increasing demand for large unit weight, high strength and extra thick steel plates. The thickness of the steel plate continues to increase, and the performance requirements are getting higher and higher. According to the investigations of major domestic steel plants, it is found that during the production of low-alloy high-strength thick plates with a thickness of 60 mm o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/02B21B37/76
Inventor 朱书成张强许少普张立新崔冠军张红伟罗洪涛贾涛孙炳红杜战军常玉峰陈雷刘靖
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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