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Boron steel ASTMA36-B medium and heavy plate and production process thereof

A technology of ASTMA36-B and production method, which is applied in the field of boron-added steel production, can solve problems such as high surface crack rate and affect contract performance, and achieve the effects of shortening the process flow, simplifying the manufacturing process, and reducing production costs

Active Publication Date: 2013-04-24
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface crack rate of the B-added steel plate is high, which affects the performance of the contract, and there is a certain difficulty in research and development

Method used

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  • Boron steel ASTMA36-B medium and heavy plate and production process thereof

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Effect test

Embodiment 1

[0026] Through converter smelting, continuous casting pouring, slab heating, rolling, controlled cooling, and slow cooling of steel plates, the boron-added steel ASTMA36-B medium-thick plate finished steel with the chemical composition described in Table 1 is obtained. The properties are shown in Table 3 below.

[0027] Table 1 Chemical composition of steel in Example 1

[0028] C(%) Si(%) Mn(%) P(%) S(%) B(%) Ti(%) Als(%) 0.175 0.32 0.99 0.018 0.005 0.0012 0.024 0.024

Embodiment 2

[0030] Through converter smelting, continuous casting pouring, slab heating, rolling, controlled cooling, and slow cooling of steel plates, the boron-added steel ASTMA36-B medium-thick plate finished steel with the chemical composition described in Table 2 is obtained. The properties are shown in Table 3 below.

[0031] Table 2 Chemical Composition of Steel in Example 2

[0032] C(%) Si(%) Mn(%) P(%) S(%) B(%) Ti(%) Als(%) 0.18 0.31 0.97 0.016 0.004 0.0013 0.021 0.027

[0033] The process route of the present invention: molten iron KR deep desulfurization→converter smelting→continuous casting pouring→slab heating→phosphorus removal→rolling→ACC→control straightening→off-line slow cooling→finishing→surface inspection→flaw detection→detection→judgment →Qualified products are put into storage.

[0034] Composition and mechanical properties are in accordance with ASTM A36 / A36-2004.

[0035] Table 3 Mechanical properties of boron-added steel ASTM...

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Abstract

The invention discloses a boron steel ASTMA36-B medium and heavy plate which comprises the following chemical components by mass (unit: wt %): C <=0.20, Si 0.15 to 0.35, Mn 0.80 to 1.10, P <=0.023, S <=0.015, B 0.0008 to 0.0020, Ti 0.010 to 0.040 and Als <=0.050, with the rest being Fe and residual elements. According to the invention, a series of processes of converter smelting, continuous casting, heating of casting blanks, controlled cooling and slow cooling of steel plates are utilized, and refining grain elements like Nb and V are not added in designing of chemical composition of the medium and heavy plate, thereby reducing cost for metallurgy and the content of impurities in molten steel; the production processes of continuous casting directly after blowing at an argon station and rolling of casting blanks after cooling in pile at temperature no more than 16 hours are employed, thereby substantially shortening process flow; a production and manufacture process for the medium andheavy plate is simple, is applicable to mass production and enables production cost to be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of boron-added steel production, and in particular relates to a boron-added steel ASTMA36-B medium-thick plate and a production method thereof. Background technique [0002] A36 steel is an American standard carbon structural steel. Because of its low strength and relatively simple production, it can be widely used in various fields. A36-B is a derivative product of A36. Since the B content of the exported steel plate is above 0.0008%, it can enjoy the national export tax rebate policy, and boron-added steel can improve the performance of the steel plate, reduce the amount of other precious alloys, and greatly reduce production costs. However, the surface crack rate of the B-added steel plate is high, which affects the performance of the contract, and there is a certain difficulty in research and development. Contents of the invention [0003] In view of the above problems, the present invention provides ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C33/06C21D8/02
Inventor 朱书成郭艳芳许少普张立新崔冠军刘庆波袁少威朱成杰雷文慧庞百鸣赵迪张兵陈景雪
Owner NANYANG HANYE SPECIAL STEEL CO LTD