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Tensile strength 600Mpa grade dual phase steel plate and its production method

A technology of tensile strength and steel plate, applied in the field of steel rolling, to achieve the effect of excellent mechanical properties

Inactive Publication Date: 2006-07-26
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the existing high-strength automobile hot-rolled steel sheets and their production processes, the present invention provides a dual-phase steel sheet with a tensile strength of 600 MPa and a manufacturing method thereof

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  • Tensile strength 600Mpa grade dual phase steel plate and its production method

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Embodiment Construction

[0013] Select the chemical composition steel shown in Table 1 as the raw material, and the continuous casting and rolling thin slab size is 60-80mm (thickness) × 1250mm (width) × 8000mm (length). The continuous casting thin slab is soaked in a tunnel furnace with a length of 100m, and then rolled by a hot continuous rolling mill. The start-rolling temperature and the final rolling temperature are controlled. After rolling, it is quickly cooled. The laminar cooling process is adopted to control the cooling rate and Final cooling temperature, and then coiling, control the thickness of the steel plate to 2.5-6mm. The cooling process is shown in Table 2, and the mechanical properties and organization scores are shown in Table 3.

[0014] Ingredient number

[0015]

[0016]

[0017] Where: R e -Yield strength; R m -Tensile strength; A 50 -Total elongation after fracture (gauge length 50mm); the corresponding implementation data for the steel with the compo...

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Abstract

Disclosed is a steel sheet with a tensile strength of 600 MPa grade wherein its constituents by mass percentage comprise C 0.05-0.08%, Si 0.20-0.40%, Mn 1.30-1.60%, and balancing Fe. Its tissue is a diphase of ferrite and martensite, wherein the volume fraction of the ferrite is 85-90%, the volume fraction of the martensite is 10-15%, and the manufacturing process consists of sheet bar continuous casting and rolling, fast cooling, soaking continuous casting sheet bar through tunnel furnace, controlling the tapping temperature to be 1100-1150 deg. C, controlling the initial rolling temperature between 1100-1150 deg. C, and end rolling temperature at 780-850 deg. C, fast cooling after rolling, and drawing-up after cooling.

Description

Technical field [0001] The invention belongs to the technical field of steel rolling, and relates to the manufacture of high-strength steel for automobile structural parts, in particular to a dual-phase steel plate with a tensile strength of 600 MPa and a manufacturing method. Background technique [0002] The development of high-strength hot-rolled steel sheets for automobiles has always been one of the hotspots in materials research at home and abroad. The commonly used ferrite + pearlite hot-rolled steel sheet has a maximum strength of 500 MPa. Although adding microalloying elements such as Nb or Ti can further increase the strength, the formability will become worse, thus limiting its application. To further increase the strength, dual-phase steel was developed. Dual-phase high-strength steel is characterized by the distribution of about 15% of the hard phase on the fine ferrite matrix, which is further strengthened by solid solution atoms. The resistance of ferrite-bainite a...

Claims

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Application Information

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IPC IPC(8): C22C38/04C21D8/02C21D11/00B21B3/00B21B37/56B21B37/74B21C47/02
Inventor 刘彦春刘相华李艳梅王国栋
Owner NORTHEASTERN UNIV
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