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980 MPa-level vanadium-contained ultrafine grain cold rolled dual-phase steel and preparing method thereof

An ultra-fine grain, 980mpa technology, applied in the field of cold-rolled ultra-high-strength steel for automobiles, can solve the problems of long production cycle, no comprehensive consideration of cost, performance and production, affecting industrial production efficiency, etc., and achieve the effect of low production cost.

Active Publication Date: 2016-07-27
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

However, this method requires two annealings and a long production cycle, which seriously affects the efficiency of industrial production
[0006] To sum up, the existing invention mainly considers the production cost, welding performance and mechanical properties of dual-phase steel unilaterally, and does not comprehensively consider factors such as cost, performance and production

Method used

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  • 980 MPa-level vanadium-contained ultrafine grain cold rolled dual-phase steel and preparing method thereof
  • 980 MPa-level vanadium-contained ultrafine grain cold rolled dual-phase steel and preparing method thereof
  • 980 MPa-level vanadium-contained ultrafine grain cold rolled dual-phase steel and preparing method thereof

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preparation example Construction

[0043] The preparation method of the above-mentioned 980MPa class vanadium-containing ultra-fine grain cold-rolled dual-phase steel comprises the following steps:

[0044] a. Smelting process: smelting according to the chemical composition of the 980MPa vanadium-containing ultra-fine-grain cold-rolled dual-phase steel described in any one of claims 1 to 4, and controlling the vanadium content in the converter, specifically during the process of extracting vanadium in the converter According to production needs, to control the vanadium content in the original molten iron, instead of adding additional ferro-vanadium alloy, and finally casting it into a slab;

[0045] b. Hot rolling process: the slab obtained in step a is heated, dephosphorized, hot-rolled, laminar cooling and coiled to obtain hot-rolled coils; the heating temperature is 1200-1300 °C, and the finishing rolling temperature is 1000 °C. ~1100℃, the final rolling temperature is 850~950℃, the hot rolling thickness is ...

Embodiment 1

[0055] The preparation method of the 980MPa vanadium-containing ultra-fine-grain cold-rolled dual-phase steel provided by the present invention has the following processes:

[0056] (1) Through the smelting process, a dual-phase steel slab with the chemical composition shown in Table 1 is prepared:

[0057] Table 1 Chemical Composition of Duplex Steel (wt.%)

[0058] Numbering

C

Si

mn

P

S

als

Cr

V

N

DP1

0.13

0.60

2.00

0.013

0.008

0.050

0.55

0.10

0.004

DP2

0.14

0.70

1.90

0.014

0.006

0.030

0.45

0.08

0.005

[0059] (2) After heating, dephosphorization, hot rolling and laminar cooling to obtain hot rolled coils, the starting temperature of finish rolling is 1000-1100°C, the finishing rolling temperature is 850-950°C, and the coiling temperature is 500°C ~700°C; the specific hot rolling process parameters are shown in Table 2 below:

[0060] T...

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Abstract

The invention provides 980 MPa-level vanadium-contained ultrafine grain cold rolled dual-phase steel and a preparing method, and belongs to the technical field of cold rolling ultrahigh strength steel for an automobile. The 980 MPa-level vanadium-contained ultrafine grain cold rolled dual-phase steel is composed of, by weight percent, 0.10% to 0.20% of C, 0.30% to 1.00% of Si, 1.50% to 2.50% of Mn, 0.20% to 0.80% of Cr, 0.01% to 0.06% of Al, 0.05% to 0.15% of V, not larger than 0.020% of P, not larger than 0.015% of S, not larger than 0.006% of N and the balance Fe and inevitable impurities. Ferrite and martensite grains are refined through the micro amount of V; and meanwhile, VC dispersed precipitation plays a role in strengthening sedimentation, and the production cost is obviously reduced. The prepared cold rolled dual-phase steel is excellent in mechanical property, forming property and welding property, the cost advantages are obvious, and the obvious economic benefits and social benefits are achieved.

Description

technical field [0001] The invention provides a 980MPa grade vanadium-containing ultra-fine-grain cold-rolled dual-phase steel and a preparation method thereof, belonging to the technical field of cold-rolled ultra-high-strength steel for automobiles. Background technique [0002] With the development of automobile lightweight technology, it has become an inevitable trend for automobile steel to develop towards high-strength steel. Due to the characteristics of low yield strength, high tensile strength and excellent plasticity, dual-phase steel has become the preferred high-strength steel for automobiles, and its consumption is expected to exceed 70% of the advanced high-strength steel for automobiles. With the continuous release of domestic auto sheet production capacity, the competition in the high-strength steel market has become increasingly fierce. Low-cost, high-performance dual-phase steel has become the goal pursued by various companies and has attracted great attent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/18C22C38/06C22C38/12C21D8/02
CPCC21D8/0226C21D8/0247C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/12C22C38/18
Inventor 郑之旺邝春福常军徐权张功庭王敏莉王礞余灿生于秀
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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