Preparation method for high chambering steel plate with strength of extension not smaller than 600 MPa

A technology of tensile strength and steel plate, which is applied in the field of preparation of high reaming steel plate, can solve problems such as uneven structure and performance, poor plate shape, etc., and achieve the effect of good performance consistency and stable performance

Active Publication Date: 2019-05-28
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the existing high-expansion hot-rolled sheet and pickled sheet with a tensile strength not less than 600 MPa have poor shape, uneven structure and performance

Method used

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  • Preparation method for high chambering steel plate with strength of extension not smaller than 600 MPa
  • Preparation method for high chambering steel plate with strength of extension not smaller than 600 MPa
  • Preparation method for high chambering steel plate with strength of extension not smaller than 600 MPa

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preparation example Construction

[0024] Specifically, a method for preparing a high hole-expanding steel plate with a tensile strength not less than 600MPa, comprising the following steps: hot metal desulfurization, converter smelting, LF refining, continuous casting, hot rolling; the hot rolling is specifically slab heating , rough rolling, finish rolling, laminar flow segmental cooling, coiling, stacking and slow cooling; the chemical composition of the steel plate is calculated by mass percentage: C 0.06-0.10%, Si0.20-0.30%, Mn 1.30-1.70 %, P≤0.020%, S≤0.010%, Nb 0.040~0.060%, N≤0.0060%, Al 0.015~0.060%, and the balance is Fe and unavoidable impurities.

[0025] The choice of C content range mainly considers the matching of strength, formability and welding performance. If the C content is lower than 0.06%, the carbon content in bainite will be reduced and its strength will be affected; if it is higher than 0.10%, the formability and weldability of the steel plate will be affected. The resistance will be r...

Embodiment 1

[0038] The composition (mass percentage) of the high hole expansion steel is: C 0.07, Si 0.25, Mn 1.49, P 0.009, S 0.002, Nb0.046, Al 0.042, N 0.0034.

[0039] A production method of hot-dip galvanized steel plate, according to the usual process of molten iron desulfurization, converter smelting, and LF refining, through continuous casting into continuous casting slabs, the slabs at a temperature of 620°C are heated and loaded into a heating furnace, and the heating time is It was 139min, and the tapping temperature was 1232°C. The slab is rolled to 38mm by 5-pass reversing rolling mill, and enters the 7-stand finishing rolling unit. The final rolling temperature is 886°C, the thickness of the rolled product is 2.52mm, and the strip speed of the last stand is 8.9m / s; After rolling, cool at 124°C / s for 1.4s, then air cool for 6.1s, then cool at 46°C / s to 500°C for coiling, and the steel coils are finally sent to the slow cooling pit and slowly cooled to room temperature at 0.43...

Embodiment 2

[0043] The method is the same as in Example 1, and the differences in process, finished product structure and performance are shown in Tables 1 to 4, respectively.

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Abstract

The invention discloses a preparation method for a high chambering steel plate with strength of extension not smaller than 600 MPa and belongs to the technical field of steel plate production. The preparation method comprises the following steps of molten iron desulphurization, converter smelting, LF refining, continuous casting and hot continuous rolling; and hot continuous rolling specifically comprises plate blank heating, rough rolling, finish rolling, laminar flow segmented cooling, reeling and stacking and slow cooling. The steel plate comprises chemical components including, by mass percent, 0.06%-0.10% of C, 0.20%-0.30% of Si, 1.30%-1.70% of Mn, 0.020% or less of P, 0.010% or less of S, 0.040%-0.060% of Nb, 0.0060% or less of N, 0.015%-0.060% of Al and the balance Fe and unavoidable impurities. According to the method, by combining laminar flow segmented cooling and a strip steel speed and carrying out accurate control over cooling time, the performance of the prepared steel plate is stable.

Description

technical field [0001] The invention belongs to the technical field of steel plate production, and in particular relates to a method for preparing a high-hole expansion steel plate with a tensile strength not less than 600 MPa. Background technique [0002] With the development of automobile lightweight, automobile steel materials are also developing in the direction of high strength, high machinability, high corrosion resistance and aesthetics. For hot-rolled sheets, pickled sheets or hot-dip galvanized sheets for automobile chassis parts or internal structural parts, not only high strength is required, but also according to the forming characteristics of parts (stamping, flanging, bending, reaming, etc.), it also has Good hole expansion performance. [0003] At present, there have been related reports on the preparation methods of high-expansion hot-rolled steel sheets and pickled sheets with a tensile strength of 600 MPa, but there are certain problems. For example: CN2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/02C23G1/08C23C2/06C23C2/40
Inventor 张功庭郑之旺杨晓东张增枢
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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