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800 MPa-grade low-carbon hot-galvanized dual-phase steel and preparation method thereof

A dual-phase steel and hot-dip galvanizing technology, which is applied in the field of high-strength steel preparation, can solve the problems of not comprehensively considering production cost, formability, galvanizing performance and welding performance, and achieves the effect of ensuring strength and low production cost.

Active Publication Date: 2016-10-12
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

[0005] To sum up, the existing invention mainly considers the galvanizing performance and mechanical properties of dual-phase steel unilaterally, and does not comprehensively consider factors such as production cost, formability, galvanizing performance and welding performance.

Method used

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  • 800 MPa-grade low-carbon hot-galvanized dual-phase steel and preparation method thereof
  • 800 MPa-grade low-carbon hot-galvanized dual-phase steel and preparation method thereof
  • 800 MPa-grade low-carbon hot-galvanized dual-phase steel and preparation method thereof

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preparation example Construction

[0040] The preparation method of above-mentioned a kind of 800MPa level low-carbon hot-dip galvanized dual-phase steel comprises the following steps:

[0041] a. Smelting process: smelting according to the weight percentage composition of the above-mentioned 800MPa grade low-carbon hot-dip galvanized dual-phase steel, and controlling the vanadium content in the converter (that is, by controlling the vanadium content in the original molten iron instead of adding additional vanadium-iron alloy, reducing production costs), cast into slabs;

[0042] b. Hot rolling process: hot-rolled coils are obtained after the slab is heated, dephosphorized, hot-rolled and laminar cooling; wherein, the starting temperature of the finish rolling is 1000-1100°C, and the finishing rolling temperature is 850-950°C. Take the temperature as 600~700℃;

[0043] c. Pickling process: hot-rolled coils are pickled and then cold-rolled to obtain cold-rolled thin strip steel; wherein, the cold-rolled reducti...

Embodiment 1

[0052] The preparation method of 800MPa grade low-carbon hot-dip galvanized dual-phase steel provided by the present invention has the following processes:

[0053] (1) Through the smelting process, a dual-phase steel slab with the chemical composition shown in Table 1 is prepared:

[0054] Table 1 Chemical Composition of Duplex Steel (wt.%)

[0055] Numbering

C

Si

mn

P

S

als

Cr

Mo

V

N

DP1

0.08

0.30

1.70

0.012

0.002

0.050

0.50

0.25

0.07

0.004

DP2

0.09

0.25

1.60

0.011

0.002

0.030

0.45

0.30

0.10

0.005

[0056] (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 600°C ~700°C; the specific hot rolling process parameters are shown in Table 2 below:

[0057] Table 2 Main process...

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Abstract

The invention belongs to the technical field of preparation of high-strength steel, and in particular, relates to 800 MPa-grade low-carbon hot-galvanized dual-phase steel and a preparation method thereof. The 800 MPa-grade low-carbon hot-galvanized dual-phase steel comprises the following components in percentage by weight: 0.05-0.10% of C, 0.20-0.60% of Si, 1.30-1.80% of Mn, 0.10-0.60% of Cr, 0.20-0.50% of Mo, 0.02-0.06% of Al, 0.05-0.10% of V, P not more than 0.015%, S not more than 0.005%, N not more than 0.006%, and the balance of Fe and inevitable impurities. The 800 MPa-grade low-carbon hot-galvanized dual-phase steel is low in production cost, high in forming performance and welding performance and excellent in galvanizing performance and mechanical performance, and reaches the yield strength of 450-520 MPa, the tensile strength of 805-840 MPa and the elongation of 15-18%.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel preparation, and in particular relates to an 800MPa low-carbon hot-dip galvanized dual-phase steel and a preparation 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 (CN 10...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/12C22C38/06C21D8/02
CPCC21D8/0226C21D8/0236C21D8/0247C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12C22C38/18
Inventor 郑之旺邝春福左军张功庭王敏莉余灿生于秀
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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