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High-formability high-strength hot-dip galvanized dual-phase steel and production method thereof

A production method, hot-dip galvanizing technology, applied in the direction of hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problem of reduced welding performance, increased hot rolling load, and no comprehensive consideration of formability, galvanizing performance and Welding performance and other issues, to achieve the effect of excellent welding performance, excellent galvanizing performance, significant economic and social benefits

Active Publication Date: 2019-10-15
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

Although cold-rolled dual-phase steel with excellent comprehensive mechanical properties can be obtained through its chemical composition and preparation method, its high C content significantly reduces its welding performance, and at the same time, the combination of Ti and Nb significantly increases the hot-rolling load
[0005] To sum up, the prior art mainly considers the mechanical properties of dual-phase steel unilaterally, and does not comprehensively consider factors such as formability, galvanizing performance, and welding performance.

Method used

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  • High-formability high-strength hot-dip galvanized dual-phase steel and production method thereof
  • High-formability high-strength hot-dip galvanized dual-phase steel and production method thereof

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Embodiment 1

[0042] The high-formability and high-strength hot-dip galvanized dual-phase steel of this embodiment is produced according to the following process:

[0043] (1) Smelting process: C: 0.076%, Si: 0.25%, Mn: 2.0%, Cr: 0.49%, Mo: 0.22%, Als: 0.039%, Nb: 0.03%, V: 0.05%, P: 0.010% , S: 0.002%, N: 0.004%, and control the V content in the converter, by controlling the V content in the original molten iron instead of adding vanadium-iron alloy, and then casting it into a slab with a thickness of 200mm;

[0044] (2) Hot rolling process: hot-rolled coils are obtained after the billet is heated, dephosphorized, hot-rolled and laminar cooling, wherein the heating temperature is 1250°C, the finish rolling temperature is 1080°C, and the final rolling temperature is 840-900°C , the coiling temperature is 580-600°C, and the thickness of the hot-rolled sheet is 2.8mm;

[0045] (3) Pickling process: the above-mentioned hot-rolled coils are cold-rolled into cold-rolled strips after pickling, a...

Embodiment 2

[0049] The high-formability and high-strength hot-dip galvanized dual-phase steel of this embodiment is produced according to the following process:

[0050] (1) Smelting process: C: 0.081%, Si: 0.27%, Mn: 2.1%, Cr: 0.52%, Mo: 0.20%, Als: 0.033%, Nb: 0.02%, V: 0.06%, P: 0.011% , S: 0.003%, N: 0.003%, and control the V content in the converter, by controlling the V content in the original molten iron instead of adding vanadium-iron alloy, and then casting it into a slab with a thickness of 200mm;

[0051] (2) Hot rolling process: the billet is heated, dephosphorized, hot-rolled and laminar cooling to obtain hot-rolled coils, wherein the heating temperature is 1250°C, the finish rolling temperature is 1070°C, and the final rolling temperature is 890-920°C , the coiling temperature is 600-630°C, and the thickness of the hot-rolled sheet is 3.5mm;

[0052] (3) Pickling process: the above-mentioned hot-rolled coils are cold-rolled into cold-rolled strips after pickling, and the co...

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Abstract

The invention relates to high-formability high-strength hot-dip galvanized dual-phase steel and a production method thereof, and belongs to the technical field of dual-phase steel metallurgy. The hot-dip galvanized dual-phase steel comprises the following chemical components of 0.05-0.10% of C, 0.20-0.50% of Si, 1.50-2.50% of Mn, 0.40-1.00% of Cr, 0.10-0.50% of Mo, 0.02-0.06% of Al, 0.010-0.050% of Nb, 0.04-0.10% of V, less than or equal to 0.015% of P, less than or equal to 0.005% of S and less than or equal to 0.006% of N. The preparation method comprises the following steps of smelting, hotrolling, acid rolling and hot-dip galvanizing annealing, and the hot-dip galvanizing annealing adopts a pre-oxidation reduction process. The prepared hot-dip galvanized dual-phase steel has excellentformability, welding performance and galvanization performance, and meets the requirements of high strength and high elongation.

Description

technical field [0001] The invention belongs to the technical field of dual-phase steel metallurgy, and in particular relates to a high-formability high-strength hot-dip galvanized dual-phase steel and a production method thereof. 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 attention. [0003] Patent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/38C21D1/26C21D1/74C23C2/06C23C2/40
CPCC21D1/26C21D1/74C21D8/0226C21D8/0236C21D8/0273C21D2211/001C21D2211/005C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/38C23C2/06C23C2/40
Inventor 王敏莉郑之旺余灿生郑昊青
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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