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A kind of 600mpa grade vanadium-containing hot-dip galvanized dual-phase steel and its preparation method

A technology of hot-dip galvanizing and dual-phase steel, which is applied in hot-dip galvanizing process, coating, metal material coating process, etc. Deterioration of quality and welding performance, affecting painting and welding, etc., to achieve the effect of improving surface galvanizing quality, improving forming and welding performance, and increasing strength

Active Publication Date: 2017-09-29
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase of Mn content in hot-dip galvanized dual-phase steel will inevitably lead to the decline of galvanized surface quality and welding performance, which will affect the subsequent coating and welding processes.
[0006] To sum up, the existing invention mainly considers the production cost, 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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  • A kind of 600mpa grade vanadium-containing hot-dip galvanized dual-phase steel and its preparation method
  • A kind of 600mpa grade vanadium-containing hot-dip galvanized dual-phase steel and its preparation method
  • A kind of 600mpa grade vanadium-containing hot-dip galvanized dual-phase steel and its preparation method

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preparation example Construction

[0044] The preparation method of the 600MPa grade vanadium-containing hot-dip galvanized dual-phase steel of the present invention comprises the following steps:

[0045] a. Smelting process: smelting according to the chemical composition of the above-mentioned 600MPa grade vanadium-containing hot-dip galvanized dual-phase steel, and controlling the vanadium content in the converter, specifically to control the original molten iron in the process of vanadium extraction in the converter according to production needs vanadium content, rather than additional ferro-vanadium alloys, and finally cast into slabs;

[0046] b. Hot rolling process: the slab obtained in step a is heated, dephosphorized, hot-rolled, laminar cooling and coiled to obtain hot-rolled coils; the heating temperature is 1200-1300 °C, and the finishing rolling temperature is 1000 °C. ~1100℃, the final rolling temperature is 850~950℃, the hot rolling thickness is 4~5mm, and the coiling temperature is 550~650℃;

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Embodiment 1

[0057] The preparation method of the 600MPa grade vanadium-containing hot-dip galvanized dual-phase steel provided by the present invention has the following processes:

[0058] (1) Through the smelting process, a dual-phase steel slab with the chemical composition shown in Table 1 is prepared:

[0059] Table 1 Chemical Composition of Duplex Steel (wt.%)

[0060] serial number

C

Si

mn

P

S

als

Cr

Mo

V

N

DP1

0.08

0.40

1.50

0.01

0.008

0.050

0.35

0.15

0.04

0.004

DP2

0.09

0.32

1.60

0.01

0.006

0.030

0.25

0.12

0.02

0.005

[0061] (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 final rolling temperature is 850-950°C, and the coiling temperature is 550°C ~650°C; specific hot rolling process parameters are shown in Table 2 below:

[0062] Table 2 Main pr...

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Abstract

The invention belongs to the technical field of hot-galvanizing high-strength steel for automobiles and particularly relates to 600MPa-level vanadium-containing hot-galvanizing dual-phase steel and a preparation method thereof. The dual-phase steel comprises the following components in percentage by weight: 0.04%-0.10% of C, 0.10%-0.60% of Si, 1.30%-1.90% of Mn, 0.10%-0.50% of Cr, 0.05%-0.25% of Mo, 0.01%-0.06% of Al, 0.01%-0.05% of V, less than or equal to 0.020% of P, less than or equal to 0.015% of S, less than or equal to 0.006% of N and the balance of Fe and inevitable impurities. According to the dual-phase steel, partial Cr and Mo are replaced with trace V and Si, so that the strength and hardenability of the dual-phase steel are improved, and meanwhile, the production cost is lowered; and by combining with a pre-oxidization reduction process, the surface galvanizing quality of the dual-phase steel is improved. The hot-galvanizing dual-phase steel prepared by virtue of the preparation method has excellent forming property, welding property and galvanizing property, oblivious cost advantage and remarkable economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of hot-dip galvanized high-strength steel for automobiles, and in particular relates to a 600MPa-grade vanadium-containing 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 gre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C38/12C22C38/06C22C38/04C22C38/02C21D8/02C23C2/06C23C2/26
CPCC21D8/0226C21D8/0236C22C38/02C22C38/04C22C38/06C22C38/12C22C38/18C23C2/06C23C2/26
Inventor 郑之旺邝春福常军徐权张功庭王敏莉王礞余灿生于秀
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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