Hot rolled dual phase steel plate with 650MPa of tensile strength and manufacturing method thereof

A tensile strength, steel plate technology, applied in the low-carbon continuous cooling low-temperature coiled hot-rolled dual-phase steel plate and its manufacturing, steel and its preparation fields, can solve the problem of difficulty in guaranteeing, prominent longitudinal unevenness of products, air-cooling start, The end temperature is difficult to accurately control and other problems, to achieve the effect of good performance, low alloy cost and uniform microstructure

Inactive Publication Date: 2010-06-02
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the above-mentioned invention patents all disclose the preparation method of dual-phase steel plate with high tensile strength, the segmental cooling method used usually has the following defects, that is, it is difficult to accurate

Method used

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  • Hot rolled dual phase steel plate with 650MPa of tensile strength and manufacturing method thereof
  • Hot rolled dual phase steel plate with 650MPa of tensile strength and manufacturing method thereof
  • Hot rolled dual phase steel plate with 650MPa of tensile strength and manufacturing method thereof

Examples

Experimental program
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Example Embodiment

[0034] Example 1

[0035] The hot-rolled dual-phase steel sheet contains chemical components and their weight percentages: C 0.08%, Si 0.69%, Mn 1.43%, P 0.009%, S 0.0041%, and the rest are Fe and other unavoidable impurities.

[0036] The steel plate was simulated rolling experiment on Gleeble3800 thermal simulator. The process is:

[0037] Configure steelmaking raw materials according to the components of the dual-phase steel plate, obtain molten steel by converter or electric furnace smelting, and continuously cast into experimental steel blocks of 10×15×20 mm;

[0038] Austenitize the experimental steel block at 1200℃ for 10 minutes;

[0039] After holding temperature, hot rolling is carried out. The starting temperature of rough rolling is 1050℃ and the deformation is 0.45. Then finish rolling is carried out at 900℃, 875℃, 850℃ and 825℃ respectively, and the finish rolling deformation is 0.28, 0.2, 0.18 and respectively. 0.15, the deformation rate is 1 / s, and the final rolling tem...

Example Embodiment

[0042] Example 2

[0043] The chemical composition and weight percentage of the hot-rolled dual-phase steel plate are the same as those in Example 1, and the thickness specification is 10mm. The mechanical properties and structure are shown in Table 1 and Figure 1~2 . The preparation process of the hot-rolled dual-phase steel sheet is:

[0044] Configure steelmaking raw materials according to the two-phase steel plate components, obtain molten steel by converter or electric furnace smelting, and continuously cast into slabs;

[0045] The slab is heated at 1200℃ for 2h;

[0046] Rolling is carried out after heat preservation, the rough rolling opening temperature is 1078℃, the rough rolling reduction is 0.15, 0.20 and 0.20, the finishing rolling opening temperature is 963℃, and the finishing reduction is 0.28, 0.28, 0.26, 0.18, respectively. 0.18 and 0.13, the final rolling temperature is 874℃;

[0047] After rolling, it is cooled to 200°C by continuous laminar flow and coiled. The c...

Example Embodiment

[0048] Example 3

[0049] The hot-rolled dual-phase steel sheet contains the same chemical composition and its weight percentage as in Example 1, and its preparation process is similar to that in Example 2, but its finishing rolling temperature is 971°C, and the final rolling temperature is 880°C. Continuous laminar cooling to 150°C and coiling, the cooling rate is 47.6°C / s. The mechanical properties of the hot-rolled dual-phase steel sheet are shown in Table 1.

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Abstract

The invention relates to a hot rolled dual phase steel plate with 650MPa of the tensile strength and a manufacturing method thereof. The dual phase steel plate contains the ingredients by weight percent of: 0.05-0.12% of C, 0.5-1.2% of Si, 1.0-1.6% of Mn and the balance of Fe and impurities. The manufacturing method of the dual phase steel plate comprises the step: a steel billet containing the same ingredients as the hot rolled dual phase steel plate is sequentially subject to heating, heat insulation, hot rolling and continuous laminar cooling, followed by take-up. The dual phase steel plate according to the invention is designed by adopting common low carbon-silcomanganese steel, has the characteristics of low alloy cost, excellent performance, simple manufacturing process, high production efficiency and great controllability, and is liable to be implemented on traditional continuous hot rolling production line.

Description

technical field [0001] The invention relates to a steel material and a preparation method thereof in the technical field of metal material manufacturing, in particular to a low-carbon continuous cooling low-temperature coiling hot-rolled dual-phase steel plate with a tensile strength of 650 MPa and a manufacturing method thereof. Background technique [0002] At present, advanced high-strength steel (AHSS) is widely used in automotive structural parts to improve driving safety, fuel economy and environmental friendliness, and to save manufacturing costs. Therefore, the development of high-strength hot-rolled steel sheets for automobiles has always been one of the hotspots in the field of materials research. However, the maximum tensile strength of general ferritic pearlitic steel plate is about 500MPa. Although the tensile strength can be improved after adding Cu, Ni, Cr or Nb, V, Ti and other alloying elements, but at the same time The yield strength and yield ratio (yield...

Claims

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Application Information

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IPC IPC(8): C22C38/04B21B1/22B21B37/74B21C37/02
Inventor 杨瑞青季长恩许振刚李化龙
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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