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1000 MPa low-carbon hot-galvanized dual-phase steel and preparation method thereof

A technology of dual-phase steel and hot-dip galvanizing, applied in hot-dip galvanizing process, coating, metal material coating process, etc. Unable to meet and other problems, to achieve the effect of excellent mechanical properties

Active Publication Date: 2016-09-21
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 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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  • 1000 MPa low-carbon hot-galvanized dual-phase steel and preparation method thereof
  • 1000 MPa low-carbon hot-galvanized dual-phase steel and preparation method thereof
  • 1000 MPa 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 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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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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