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700 MPa hot-rolled dual phase steel plate with low yield ratio and manufacture method thereof

A technology of hot-rolled dual-phase steel and low yield ratio, applied in the field of metal materials, can solve the problems of high production cost and high content of microalloying elements, and achieve weight reduction, low yield ratio, high work hardening and bake hardening performance effect

Active Publication Date: 2014-06-25
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in the invention publication number CN 101279330A, the tensile strength of the hot-rolled dual-phase steel produced by adding 0.050% Nb or 0.047~0.049%Nb+0.21~0.36%Mo elements and adopting a coiling temperature of 500~600°C reaches 700MPa, and the yield strength The ratio is 0.59~0.64, but the content of microalloying elements is high, and the production cost is high

Method used

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  • 700 MPa hot-rolled dual phase steel plate with low yield ratio and manufacture method thereof
  • 700 MPa hot-rolled dual phase steel plate with low yield ratio and manufacture method thereof
  • 700 MPa hot-rolled dual phase steel plate with low yield ratio and manufacture method thereof

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Embodiment Construction

[0026] The present invention will be described in detail below according to the accompanying drawings, which is a preferred embodiment among various implementations of the present invention.

[0027] A method for manufacturing hot-rolled dual-phase steel with a tensile strength of 700 MPa and a low yield ratio, the main chemical components of which are: 0.06%~0.09%C, 1.0%~1.2%Si, 1.10%~1.30%Mn, 0.020% ~0.050%Al, 0.4%~0.6%Cr, the balance is Fe.

[0028] The present invention adopts the above-mentioned chemical components, and the manufacturing process is: molten iron pretreatment → converter smelting → alloy fine-tuning station → LF → continuous casting → hot continuous rolling → laminar cooling → coiling.

[0029] The present invention adopts the above chemical composition and technological process to produce hot-rolled dual-phase steel with a tensile strength of 700 MPa and a low yield strength ratio, specifically according to the following steps:

[0030] 1) The thickness o...

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Abstract

The present invention relates to a 700MPa hot-rolled dual phase steel plate low yield ratio and a manufacture method thereof. The hot-rolled dual phase steel plate comprises, by weight, 0.06%-0.09% of C, 1.0%-1.2% of Si, 1.10%-1.30% of Mn, 0.020%-0.050% of Al, 0.4%-0.6% of Cr and the balance of Fe. The manufacture method comprises the following steps: (1) heating a billet by a heating furnace; (2) taking the billet out of the heating furnace, and rolling the billet by a hot continuous rolling machine; (3) carrying out subsection cooling by a laminar cooling process after rolling; and (4) coiling.

Description

technical field [0001] The invention relates to metal materials, to the technical field of continuous hot-rolled metal strips, to the manufacture of high-strength steel for automotive structural parts, and in particular to a hot-rolled dual-phase steel plate with a tensile strength of 700MPa and a low yield ratio and a manufacturing method thereof. Background technique [0002] The development and application of high-strength automotive steel plate materials is one of the main measures to realize the lightweight of automobiles. Generally, low-alloy high-strength steel mainly adopts ferrite + pearlite structure materials with single or composite addition of microalloying elements such as Nb, V, and Ti. As the strength increases, the formability of the material decreases, especially when the tensile strength reaches 700MPa, the yield ratio of the material is also as high as 0.80 or more, not only the abrasive load is high and the loss is large, but also the stamping parts have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C21D8/02
Inventor 张建胡学文刘雅政张宜杨光亮刘永刚潘红波舒宏富赵勇谷海容
Owner MAGANG (GROUP) HOLDING CO LTD