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S275JR thick borated steel plate and production method thereof

A technology of S275JR and production method, applied in the field of S275JR thick specification boron-added steel plate and its production, can solve the problems of high manufacturing cost, long production cycle, limited effect of structure improvement, etc., and achieve reasonable composition and process design, loose process system, The effect of positive social benefits

Active Publication Date: 2014-09-03
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After boron is added, cracks are prone to appear on the surface of the slab. When the thickness of the slab is constant, the cracks on the surface of the slab are difficult to eliminate by rolling due to the small compression ratio of the thick steel plate, resulting in cracks on the surface of the rolled steel plate. After the surface cracks are ground, the thickness of the steel plate is often lower than the lower limit, resulting in unplanned or degraded steel plates, or even being scrapped, and the pass rate of the steel plate is low
[0003] In addition to the surface quality of S275JR boron-added steel is not easy to control, due to the small compression ratio during rolling of thick gauge steel plates, the effect of rolling on improving the structure is limited, and the mechanical properties often fail to meet the standard requirements.
In order to ensure the mechanical properties, when the S275JR thick gauge steel plate is produced by the traditional process, the steel plate is generally heat-treated after the steel plate is rolled. The process is complex, the production cycle is long, and the manufacturing cost is high.

Method used

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  • S275JR thick borated steel plate and production method thereof
  • S275JR thick borated steel plate and production method thereof
  • S275JR thick borated steel plate and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] The thickness of the slab is 250mm, the temperature of the slab out of the furnace is 1180°C, the heating time of the slab is 270 minutes, and the chemical composition (percentage by weight) of the slab is: C0.13%, Si0.2%, Mn1.0%, P0 .02%, S0.005%, Als0.017%, Ca0.0015%, B0.0011%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 50 mm, the detailed rolling and cold removal process is shown in Table 1, and its mechanical properties are shown in Table 2. The steel plate meets the requirements of the first-level flaw detection.

[0049] Such as figure 1 Shown is the metallographic structure diagram of the steel plate in Example 1 of the present invention. It can be seen from the metallographic diagram that the structure of the steel plate is ferrite + pearlite, the ferrite is the majority, the grains are fine and uniform, and there is no mixed crystal phenomenon. Since ferrite accounts for the majority, the grains are fine, and ...

Embodiment 2

[0055] Adopting thickness is 250mm slab, and slab furnace temperature is 1220 ℃, and slab heating time is 410 minutes, and the (weight percentage) chemical composition of slab is: C0.15%, Si0.4%, Mn1.2%, P0 .014%, S0.01%, Als0.027%, Ca0.003%, B0.0016%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 100 mm, the detailed rolling and cold removal process is shown in Table 3, and its mechanical properties are shown in Table 4.

[0056] Such as figure 2 Shown is the metallographic structure diagram of the steel plate in Example 2 of the present invention. It can be seen from the metallographic diagram that the structure of the steel plate is ferrite + pearlite, and the ferrite accounts for the majority. The grains along the thickness direction of the steel plate are fine and uniform, and there is no mixed crystal phenomenon. Since ferrite accounts for the majority, the grains are fine, and ferrite has good plasticity and toughness, th...

Embodiment 3

[0062] Adopting thickness is 250mm slab, and slab furnace temperature is 1205 ℃, and slab heating time is 373 minutes, and the (weight percentage) chemical composition of slab is: C0.14%, Si0.25%, Mn1.08%, P0 .013%, S0.007%, Als0.022%, Ca0.0021%, B0.0014%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 60mm, the detailed rolling and cold removal process is shown in Table 5, and its mechanical properties are shown in Table 6.

[0063] Such as image 3 Shown is the metallographic structure diagram of the steel plate in Example 3 of the present invention. It can be seen from the metallographic diagram that the structure of the steel plate is ferrite + pearlite, and the ferrite accounts for the majority. The grains along the thickness direction of the steel plate are fine and uniform, and there is no mixed crystal phenomenon. Since ferrite accounts for the majority, the grains are fine, and ferrite has good plasticity and toughness, t...

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Abstract

The invention discloses a S275JR thick borated steel plate which comprises the following chemical components in percentage by weight: 0.13-0.15% of C, 0.2-0.4% of Si, 1.0-1.2% of Mn, less than or equal to 0.02% of P, less than or equal to 0.01% of S, 0.0015-0.003% of Ca, 0.017-0.027% of Als, 0.0011-0.0016% of B and the balance of Fe and impurities. The invention further discloses a production method of the S275JR thick borated steel plate. By adopting a low cost component design, the steel plate with good surface quality can be produced through proper continuous casting, heating, controlled rolling and cold controlling processed by taking cheap silicon and manganese as main alloy elements. The steel plate is simple in production process, short in production period and low in manufacturing cost.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a S275JR thick gauge boron-added steel plate and a production method thereof. Background technique [0002] S275JR is a kind of structural steel produced according to European standards, which is widely used in various fields of production. Boron is generally added when producing S275JR. After boron is added, cracks are prone to appear on the surface of the slab. When the thickness of the slab is constant, the cracks on the surface of the slab are difficult to eliminate by rolling due to the small compression ratio of the thick steel plate, resulting in cracks on the surface of the rolled steel plate. After the surface cracks are ground, the thickness of the steel plate is often lower than the lower limit, resulting in unplanned or degraded steel plates, or even being sentenced to scrap, and the pass rate of the steel plate is low. [0003] In addition to the surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D8/02
Inventor 温利军张大治刘海涛董瑞峰徐建东赵超戴鑫
Owner INNER MONGOLIA BAOTOU STEEL UNION
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