Ultra-high-strength hot dip galvanizing complex-phase steel and production method thereof

A technology of ultra-high strength and production method, applied in the field of multiphase steel metallurgy, can solve the problems of not comprehensively considering formability, galvanizing performance and welding performance, and achieve significant economic and social benefits, excellent welding performance, and galvanizing performance. Excellent performance

Active Publication Date: 2019-10-18
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

[0006] To sum up, the existing invention mainly considers the mechanical properties of multi-phase steel unilaterally, and does not comprehensively consider factors such as formability, galvanizing performance and welding performance.

Method used

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  • Ultra-high-strength hot dip galvanizing complex-phase steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The high-formability and high-strength hot-dip galvanized dual-phase steel of this embodiment is produced according to the following process:

[0042] (1) Smelting process: C: 0.13%, Si: 0.32%, Mn: 1.95%, Mo: 0.28%, Als: 0.047%, Nb: 0.043%, P: 0.020%, S: 0.005%, N: 0.004% , Ti: 0.053%, and then cast into a slab with a thickness of 200mm;

[0043] (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 finishing rolling temperature is 1070°C, and the final rolling temperature is 860-900°C , the coiling temperature is 580-620°C, and the thickness of the hot-rolled sheet is 3.75mm;

[0044] (3) pickling process: the above-mentioned hot-rolled coils are cold-rolled into cold-rolled strip steel 2.3mm after pickling, wherein the cold-rolling reduction rate is 40%;

[0045] (4) Hot-dip galvanizing and annealing process: After the above-mentioned cold-roll...

Embodiment 2

[0048] The high-formability and high-strength hot-dip galvanized dual-phase steel of this embodiment is produced according to the following process:

[0049] (1) Smelting process: C: 0.13%, Si: 0.32%, Mn: 1.95%, Mo: 0.28%, Als: 0.047%, Nb: 0.043%, P: 0.020%, S: 0.005%, N: 0.004% , Ti: 0.053%, 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;

[0050] (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 890-930°C , the coiling temperature is 610~640℃, and the hot rolling thickness is 3.75mm;

[0051] (3) Pickling process: the above-mentioned hot-rolled coils are cold-rolled into cold-rolled thin strips of 2.3mm after pickling, wherein...

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Abstract

The invention relates to an ultra-high-strength hot dip galvanizing complex-phase steel and a production method thereof, and belongs to the technical field of complex-phase steel metallurgy. The hot-dip zinc complex-phase steel comprises the chemical components of 0.09%-0.16% of C, 0.20%-0.50% of Si, 1.70%-2. 50% of Mn, equal to or less than 0.025% of P, equal to or less than 0.005% of S, 0.20%-0.60% of Mo, 0.02%-0.08% of Al, 0.010%-0.070% of Nb, 0.030%-0.070% of Ti, and equal to or less than 0.006% of N. The preparation method comprises steps of smelting, hot rolling, acid pickling and hot dip galvanizing annealing process, wherein a pre-oxidation reduction process is adopted in the hot dip galvanizing annealing. The forming performance, welding performance and galvanizing performance ofthe prepared hot dip galvanizing complex-phase steel are good, which reaches the requirements of high strength and high elongation.

Description

technical field [0001] The invention belongs to the technical field of multi-phase steel metallurgy, and in particular relates to an ultra-high-strength hot-dip galvanized multi-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. Composite steel has the characteristics of high tensile strength and excellent plasticity, and has become the preferred high-strength steel for automobiles. [0003] Patent (CN109023106A) discloses a cold-rolled hot-dip galvanized multi-phase steel and its preparation method. The weight percentages of its chemical components are: C: 0.08-0.12%, Si: 0.3-0.6%, Mn: 2.0-2.5%, P: ≤0.02%, S: ≤0.015%, Al: 0.1~0.4%, Cr: 0.2~0.5%, Mo: 0.1~0.4%, Nb: 0.03~0.06%, Ti: 0.03~0.06%, B: 0.002 ~0.003%, the balance is Fe and unavoidable impurities. Although hot-dip galvanized multiphase stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/12C22C38/06C22C38/04C22C38/02C22C33/04C21D1/773C23C2/06C21D1/26C21D8/02
CPCC21D1/26C21D1/773C21D8/0205C21D8/0226C21D8/0236C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C23C2/06
Inventor 王敏莉郑之旺余灿生张功庭
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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