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Q345B protected flaw detection steel plate and production method thereof

A production method and technology for steel plates, applied in the direction of improving process efficiency, etc., can solve the problems of long production cycle of inspection steel plates and inability to complete contract performance in time.

Inactive Publication Date: 2011-05-04
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The present invention is mainly to solve the major problem that the steel plate below 50mm guarantees the flaw detection steel plate has a long production cycle in the production process and cannot complete the contract performance in time

Method used

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  • Q345B protected flaw detection steel plate and production method thereof

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Embodiment Construction

[0015] The low-alloy series structural steel Q345B steel plate with a thickness of 50mm or less in the present invention contains the following chemical composition in mass percentage (unit, wt%):

[0016] C: ≤0.18, Si: ≤0.45, Mn: ≤1.40, P: ≤0.018, S: ≤0.005, Ti: ≤0.020, Als: ≤0.015, others are Fe and residual elements.

[0017] Carbon equivalent [Ceq=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15]: ≤0.42.

[0018] The production method adopted in the present invention includes: molten iron pretreatment, converter smelting, LF refining, continuous steel casting, billet hot delivery to rolling mill, billet heating, rolling, controlled cooling, stacking and slow cooling; in the refining step, molten steel Refining uses a large amount of slag to make slag, and the retention time of white slag is controlled at more than 10 minutes; Ti is used for microalloying during the refining process; after the continuous casting step, the billet is hot sent to the rolling mill for rolling.

[0019] 1. Proce...

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Abstract

The invention discloses a low-alloy series Q345B protected flaw detection steel plate with thickness specification of less than 50 millimeters and a production method thereof. The steel plate comprises the following chemical components in percentage by mass: less than or equal to 0.18 percent of C, less than or equal to 0.45 percent of Si, less than or equal to 1.40 percent of Mn, less than or equal to 0.018 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.020 percent of Ti, less than or equal to 0.015 percent of Als, and the balance of Fe and residual elements. The production method comprises molten iron pretreatment, converter smelting, ladle furnace (LF) refining, continuous steel casting, casting blank heat transfer to a steel mill, casting blank heating, rolling, cold control, stacking and slow cooling. Because the technical scheme is adopted, compared with the prior art, the production method has the advantages of short production period, energy conservation and yield improvement.

Description

technical field [0001] The invention relates to the production of steel products, in particular to a low-alloy series Q345B flaw detection steel plate with a thickness specification below 50 mm and a production method thereof. Background technique [0002] With the development of the national economy, the demand for low-alloy series steel plates is also increasing, but customers also put forward higher requirements for the quality of steel plates while using them. The comprehensive quality of the steel plate mainly includes: mechanical performance testing, steel plate surface testing and steel plate non-destructive testing. The mechanical properties are mainly guaranteed by the chemical composition in the steel, while the surface quality and internal quality of the steel plate depend on the process optimization and production monitoring during the production process. to control. In order to ensure the internal quality of the steel plate, LF refining and a reasonable seconda...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C33/04C21D8/02
CPCY02P10/20
Inventor 张少辉朱书成张立新许少普崔冠军付全虎赵迪袁恒闫波许春乔华伟李振恒
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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