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Boron-containing low yield ratio steel and preparation method thereof

A low-yield-ratio, billet technology, applied in the field of low-yield-ratio steel and its preparation, can solve problems such as low production efficiency, long production cycle, and increased cost, and achieve low production cost, easy and stable control, and excellent comprehensive performance Effect

Active Publication Date: 2016-03-02
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the yield ratio of the steel plate can be greatly reduced by the above method, the use of the heat treatment process makes the production cycle longer, the cost increases, and the production efficiency is low.

Method used

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  • Boron-containing low yield ratio steel and preparation method thereof
  • Boron-containing low yield ratio steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The chemical composition weight percentage of low yield ratio steel is as follows:

[0058] C: 0.16%, Si: 0.38%, Mn: 1.42%, P: ≤0.022%, S: ≤0.002%, Nb: 0.001%, Ti: 0.004%, B: 0.0013%, Als: 0.026%, and the balance is Iron and unavoidable impurities.

[0059] The manufacturing method of the low-yield-ratio steel containing the above-mentioned components, the production process includes molten iron pretreatment, top-bottom combined blowing converter smelting, LF refining, slab continuous casting, wide and thick plate rolling. The operation steps are as follows:

[0060] Desulfurization of hot metal strictly follows the process regulations, the sulfur in the hot metal is controlled at 0.008%, the temperature is 1250 ℃, and the slag on the surface of the hot metal is removed after desulfurization. The pretreated molten iron enters the converter, the slagging material is added 3 minutes before the end point, the final slag basicity is controlled at R=3.0, and the end point ...

Embodiment 2

[0064] The chemical composition weight percentage of low yield ratio steel is as follows:

[0065] C: 0.16%, Si: 0.37%, Mn: 1.44%, P: ≤0.021%, S: ≤0.003%, Nb: 0.001%, Ti: 0.005%, B: 0.0013%, Als: 0.026%, and the balance is Iron and unavoidable impurities.

[0066] The manufacturing method of the low-yield-strength-ratio steel with the composition includes the production process of molten iron pretreatment, top-bottom combined blowing converter smelting, LF refining, continuous casting of slabs, and rolling of wide and thick plates. The operating steps are the same as in Example 1.

[0067] The properties of the steel plates of this embodiment are listed in Table 3. The performance test method adopts the international general method.

Embodiment 3

[0069] The chemical composition weight percentage of low yield ratio steel is as follows:

[0070] C: 0.18%, Si: 0.42%, Mn: 1.34%, P: ≤0.021%, S: ≤0.003%, Nb: 0.001%, Ti: 0.005%, B: 0.0015%, Als: 0.032%, and the balance is Iron and unavoidable impurities.

[0071] The manufacturing method of the low-yield-ratio steel with the above-mentioned composition, the production process includes molten iron pretreatment, top-bottom combined blowing converter smelting, LF refining, slab continuous casting, wide and thick plate rolling.

[0072] Desulfurization of hot metal strictly follows the process regulations, the sulfur in the hot metal is controlled at 0.005%, the temperature is 1290°C, and the slag on the surface of the hot metal is removed after desulfurization.

[0073] The pretreated molten iron enters the converter, the slagging material is added 3 minutes before the end point, the final slag basicity is controlled at R=3.5, and the end point pressure gun time is 100s. Alman...

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Abstract

Provided is a boron-containing steel with a low yield ratio and a preparation method therefor. The chemical components of the boron-containing steel are, C with a mass percent of being more than or equal to 0.15% and less than or equal to 0.19%, Si with a mass percent of being more than or equal to 0.30% and less than or equal to 0.50%, Mn with a mass percent of being more than or equal to 1.15% and less than or equal to 1.60%, S with a mass percent of being more than or equal to 0 and less than or equal to 0.030%, P with a mass percent of being more than or equal to 0 and less than or equal to 0.030%, Nb with a mass percent of being more than or equal to 0.010% and less than or equal to 0.030%, Ti with a mass percent of being more than or equal to 0.010% and less than or equal to 0.050%, B with a mass percent of being more than or equal to 0.0010% and less than or equal to 0.0030%, Als with a mass percent of being more than or equal to 0.015% and less than or equal to 0.050%, and the balance being iron and unavoidable impurities. Als is acid-soluble aluminum, and the yield ratio of the steel with a low yield ratio is less than or equal to 0.68.

Description

technical field [0001] The invention relates to a low yield ratio steel and a preparation method thereof, in particular to a boron-containing low yield ratio steel and a preparation method thereof. Background technique [0002] The ratio of the yield strength to the tensile strength of a material is called the yield ratio. The yield ratio is low, and the metal material is easy to be plastically formed, so the yield ratio has long been used to characterize the formability of the metal material. With the improvement of steel quality and application expansion, the yield strength ratio is still one of the important technical indicators for some newly developed steel grades. In order to meet special energy requirements, low yield ratio steel has become a hot spot in research and development. [0003] National standard: GB / T1591-2008 provides the chemical composition, mechanical and process performance requirements of a Q345B-B steel, as shown in Table 1 and Table 2. [0004] T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/00
Inventor 李艳高立福任继银李新东吴德发
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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