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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 accurately control the start and end temperatures of air cooling, and the large-scale production It is also difficult to guarantee such a long air-cooling time due to the fast pace, and the longitudinal unevenness of the cooled product is also very prominent

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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Effect test

Embodiment 1

[0035] The chemical composition and weight percentage of the hot-rolled dual-phase steel plate are: C 0.08%, Si 0.69%, Mn 1.43%, P 0.009%, S 0.0041%, and the rest are Fe and other inevitable impurities.

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

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

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

[0039] After heat preservation, hot rolling is carried out, the rough rolling start temperature is 1050°C, the deformation is 0.45, and then the finishing rolling is carried out at 900°C, 875°C, 850°C and 825°C respectively, and the finishing rolling deformation is 0.28, 0.2, 0.18 and 0.15, the deformation rate is 1 / s, and the final rolling temperature ...

Embodiment 2

[0043] The hot-rolled dual-phase steel plate contains the same chemical composition and weight percentage as in Example 1, and its 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 plate is as follows:

[0044] The steelmaking raw materials are configured according to the components of the dual-phase steel plate, and molten steel is obtained by smelting in a converter or an electric furnace, and continuously cast into a slab;

[0045] The slab is heated and kept at 1200°C for 2 hours;

[0046] Rolling is carried out after heat preservation, the rough rolling start temperature is 1078°C, the rough rolling reductions are 0.15, 0.20 and 0.20, the finish rolling start temperature is 963°C, and the finish rolling reductions are 0.28, 0.28, 0.26, 0.18 respectively, 0.18 and 0.13, the finishing temperature is 874°C;

[0047] After rolling, it is cooled to 200°C by...

Embodiment 3

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