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High-strength hot-dip galvanized complex-phase steel and production method thereof

A production method and hot-dip galvanizing technology, 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

Inactive 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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  • High-strength hot-dip galvanized complex-phase steel and production method thereof

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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: 0.096%, Si: 0.29%, Mn: 1.9%, Mo: 0.36%, Als: 0.049%, Nb: 0.053%, P: 0.020%, S: 0.005%, N: 0.004% , Ti: 0.089%, and then cast into a slab with a thickness of 200mm;

[0043] (2) Hot rolling process: hot-rolled coils are obtained after the cast slab is heated, dephosphorized, hot-rolled and laminar cooling, wherein the heating temperature is 1250°C, the finishing rolling temperature is 1080°C, and the final rolling temperature is 860-900°C , the coiling temperature is 590-630°C, and the thickness of the hot-rolled sheet is 3.0mm;

[0044] (3) Pickling process: cold-rolling the above-mentioned hot-rolled coils after pickling to become a cold-rolled thin strip of 1.4mm, wherein the cold-rolling reduction rate is 53.3%;

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

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: 0.096%, Si: 0.29%, Mn: 1.9%, Mo: 0.36%, Als: 0.049%, Nb: 0.053%, P: 0.020%, S: 0.005%, N: 0.004% , Ti: 0.089%, and then cast 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 finishing rolling temperature is 1090°C, and the final rolling temperature is 890-930°C , the coiling temperature is 620-650°C, and the thickness of the hot-rolled sheet is 3.5mm;

[0051] (3) Pickling process: cold-rolling the above-mentioned hot-rolled coils after pickling to become a cold-rolled thin steel strip of 1.9mm, wherein the cold-rolling reduction rate is 45.7%;

[0052] (4) Hot-dip galvanizing and annealing process: After the above-mentio...

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Abstract

The invention relates to high-strength hot-dip galvanized complex-phase steel and a production method thereof, and belongs to the technical field of complex-phase steel metallurgy. The hot-dip galvanized complex-phase steel provided by the invention comprises the following chemical components of, in percentage by weight, 0.06%-0.13% of C, 0.20%-0.50% of Si, 1.50%-2.00% of Mn, less than or equal to0.025% of P, less than or equal to 0.005% of S, 0.10%-0.60% of Mo, 0.02%-0.08% of Al, 0.010%-0.070% of Nb, 0.050%-0.120% of Ti, less than or equal to 0.006% of N. The preparation method comprises thefollowing steps of smelting, hot rolling, acid rolling and a hot-dip galvanizing annealing process, wherein the hot-dip galvanizing annealing process adopts a peroxidation reduction process. The prepared hot-dip galvanized complex-phase steel has excellent forming performance, welding performance and galvanized performance, and the requirements of high strength and high elongation are met.

Description

technical field [0001] The invention belongs to the technical field of multi-phase steel metallurgy, and in particular relates to a 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 steel is ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/06C22C38/14C21D8/02C21D1/74C23C2/06C23C2/40
CPCC21D1/74C21D8/0226C21D8/0236C21D8/0273C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C23C2/06C23C2/40
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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