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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Problems solved by technology

The present invention is mainly to solve the major problem that the steel plate below 50mm guarantees the flaw detectio

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  • Q345B protected flaw detection steel plate and production method thereof

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[0015] The Q345B steel plate of the low-alloy series structural steel Q345B with a thickness of less than 50mm with a thickness below 50mm contains the following mass percentages (unit, wt%):

[0016] C: ≤0.18, Si: ≤0.45, Mn: ≤1.40, P: ≤0.018, S: ≤0.005, Ti: ≤0.020, Als: ≤0.015, the 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 by the present invention includes: hot metal pretreatment, converter smelting, LF refining, continuous steel casting, hot billet delivery and rolling mill, casting billet heating, rolling, controlled cooling, stacking slow cooling; in the refining step, molten steel Refining adopts large amount of slag for slagging, and the holding time of white slag is controlled above 10 minutes; during the refining process, Ti is used for microalloying; after the continuous casting and pouring step, the cast slab 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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