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Tensile strength 540Mpa grade dual phase steel plate and its production method

A technology with a tensile strength of 570mpa, 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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the existing high-strength automotive hot-rolled steel sheets and their production processes, the present invention provides a dual-phase steel sheet with a tensile strength of 540 MPa and a manufacturing method thereof

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  • Tensile strength 540Mpa grade dual phase steel plate and its production method

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Embodiment Construction

[0013] The steel with the chemical composition shown in Table 1 is selected as the raw material, and the continuous casting and rolling thin slab size is 60-80 mm (thickness) × 1250 mm (width) × 8000 mm (length). The continuous cast thin slab is soaked in a tunnel furnace with a length of 100m, and then rolled by a hot continuous rolling mill. The starting and finishing temperatures are controlled, and rapid cooling is carried out after rolling. The laminar cooling process is adopted to control the cooling rate and The final cooling temperature, and then coiling, the thickness of the steel plate is controlled to be 2.5-6mm. The cooling process is shown in Table 2, and the mechanical properties and structure 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 implementation data corresponding to the st...

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Abstract

Disclosed is a steel sheet with a tensile strength of 540 MPa grade wherein its constituents by mass percentage comprise C 0.05-0.08%, Si 0.20-0.40%, Mn 1.00-1.30%, 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, 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 automotive structural parts, in particular to a dual-phase steel plate with a tensile strength of 540MPa and a manufacturing method. Background technique [0002] The development of high-strength hot-rolled steel sheets for automobiles has always been one of the hot spots in the research of materials work at home and abroad. Generally used ferrite + pearlite hot-rolled steel plate has a maximum strength of 500MPa. Although adding microalloying elements such as Nb or Ti can further increase the strength, the formability will deteriorate, thus limiting its application. To further increase strength, dual phase steels have been developed. The characteristic of dual-phase high-strength steel is that about 15% of the hard phase is distributed on the fine ferrite matrix, and it is further strengthened by solid solution atoms. The resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C21D8/02C21D11/00B21B1/46B21B37/56B21B37/74B21C47/02
Inventor 刘彦春刘相华李艳梅王国栋
Owner NORTHEASTERN UNIV
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