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A kind of 1000mpa grade low-carbon hot-dip galvanized dual-phase steel and its preparation method

A dual-phase steel and hot-dip galvanizing technology, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems of increased production difficulty, reduced welding performance, and unsatisfactory performance, and achieve excellent mechanical properties Effect

Active Publication Date: 2018-01-26
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although hot-dip galvanized dual-phase steel with excellent comprehensive mechanical properties and surface quality can be obtained through its chemical composition and preparation method, its high content of C and Mn makes its welding performance significantly reduced, and cannot meet the requirements of automobile factories. C≤0.10% ; At the same time, due to the high aluminum content, the production difficulty is obviously increased, especially the problem of high aluminum water plugging
[0005] To sum up, the existing invention 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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  • A kind of 1000mpa grade low-carbon hot-dip galvanized dual-phase steel and its preparation method
  • A kind of 1000mpa grade low-carbon hot-dip galvanized dual-phase steel and its preparation method
  • A kind of 1000mpa grade low-carbon hot-dip galvanized dual-phase steel and its preparation method

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preparation example Construction

[0040] The preparation method of above-mentioned a kind of 1000MPa grade 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 1000MPa low-carbon hot-dip galvanized dual-phase steel, and casting into slabs;

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

[0043] c. Pickling process: the hot-rolled coil is pickled and cold-rolled to prepare a cold-rolled thin strip; wherein, the cold-rolled reduction rate is 40-60%;

[0044] d. Hot-dip galvanizing annealing process: hot-dip galvanized dual-phase cold-rolled steel is prepared after cold-rolled thin strip steel is subjected to hot-dip galvanizing and...

Embodiment 1

[0052] The preparation method of 1000MPa 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]

[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 parameters of hot rolling

[0058] Numbering

Heating temperature / ℃

Finishing temperature / ℃

Finishing temperature / ℃

Coiling temperature / ℃

Hot rolling thickness / mm

DP1

1250

1050

850～900

550～600

4.0

DP2

1250

1...

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Abstract

The invention belongs to the technical field of steel for high-strength automobiles and particularly relates to 1000 MPa low-carbon hot-galvanized dual-phase steel and a preparation method thereof. The 1000 MPa low-carbon hot-galvanized dual-phase steel comprises, by weight, 0.05-0.10% of C, 0.20-0.60% of Si, 1.40-1.90% of Mn, 0.20-0.70% of Cr, 0.20-0.50% of Mo, 0.02-0.06% of Al, 0.020-0.050% of Ti, 0.010-0.040% of Nb, 0.0010-0.0030% of B, less than or equal to 0.015% of P, less than or equal to 0.005% of S, less than or equal to 0.006% of N, and the balance Fe and inevitable impurities. The 1000 MPa low-carbon hot-galvanized dual-phase steel has the high forming property and high welding property and the excellent galvanizing property and mechanical property. The 1000 MPa low-carbon hot-galvanized dual-phase steel is 630-700 MPa in yield strength, 1010-1050 MPa in tensile strength and 11-14% in elongation.

Description

technical field [0001] The invention belongs to the technical field of high-strength automobile steel, and in particular relates to a 1000MPa 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. A domestic automobile f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C38/12C22C38/14C22C38/02C22C38/04C22C38/06C22C33/04C23C2/02C23C2/06
CPCC22C33/04C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/18C22C38/54C23C2/02C23C2/06
Inventor 郑之旺邝春福张功庭王敏莉余灿生于秀
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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