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450mpa-grade hot-dip galvanized dual-phase steel and its production method

A production method, 450mpa technology, applied in the direction of hot-dip plating process, coating, metal material coating process, etc., can solve the problems of poor forming effect, increased process cost, increased alloy cost, etc., to achieve good market competitiveness, The effect of reducing the cost of production process and good surface quality

Active Publication Date: 2022-07-26
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

The patent adopts the ultra-low carbon (0.0036~0.0049%C) route, which needs to go through a vacuum RH furnace during smelting, which increases the process cost, and adds a large amount of Mn, Nb, Ti, and B elements, which increases the cost of the alloy and significantly improves the refractory temperature. Crystallization temperature (soaking temperature is 810-830°C), high process cost
The most important thing is that it is strengthened by phosphorus (P) (P: 0.078~0.095%), which is prone to grain boundary segregation. Although the elongation may be good, the forming effect is not good

Method used

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  • 450mpa-grade hot-dip galvanized dual-phase steel and its production method
  • 450mpa-grade hot-dip galvanized dual-phase steel and its production method
  • 450mpa-grade hot-dip galvanized dual-phase steel and its production method

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Embodiment 1

[0037] Example 1: This example provides two groups of low-cost 450MPa grade hot-dip galvanized dual-phase steels, whose chemical compositions are shown in Table 1:

[0038]

[0039] The preparation method of the above-mentioned low-cost 450MPa grade hot-dip galvanized dual-phase steel, the specific process is as follows:

[0040] A, smelting process: through the smelting process, prepare the dual-phase steel slab with the chemical composition shown in Table 1;

[0041] B. Hot rolling process: After heating, descaling, hot rolling and laminar cooling of the slab, a hot rolled coil is obtained. The specific hot rolling process parameters are shown in Table 2:

[0042]

[0043] C. Pickling process: after pickling the hot-rolled coil, cold-rolling it into a thin strip, wherein the cold-rolling reduction rate of the thin strip of No. 1 is 62.5%; the cold-rolling reduction rate of No. 2 is 61.0%;

[0044] D. Hot-dip galvanizing process: The cold-rolled thin strip is first hea...

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Abstract

The invention discloses a 450MPa grade hot-dip galvanized dual-phase steel and a production method thereof, belonging to the technical field of cold-rolled strip production. The chemical composition of the dual-phase steel by mass percentage is: C 0.03%-0.10%, Si 0.20-0.60%, Mn 1.20%-2.00%, P≤0.020%, S≤0.010%, Als 0.015%-0.070%, N ≤0.0060%, the remaining elements are Fe and inevitable impurities; its microstructure is: 90-96% ferrite and 4-10% martensite by volume percentage. The preparation method includes the steps of smelting, hot rolling, pickling and hot-dip galvanizing. The production method of the dual-phase steel of the present invention adopts the sparse cooling method, which is beneficial to the stable control of the microstructure and properties; the opening and closing methods of the descaling and the cooling water between the racks are defined, which is beneficial to obtain a good surface quality. Combined with the smelting and hot-dip galvanizing process, the good mechanical properties and surface quality of the 450MPa hot-dip galvanized dual-phase steel sheet have been obtained, which has good market competitiveness.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled strip production, and in particular relates to a 450MPa-grade hot-dip galvanized dual-phase steel and a production method thereof. Background technique [0002] With the continuous development of automobile lightweight and the continuous improvement of occupant safety requirements, the proportion and amount of high-strength steel in automobile body-in-white have increased rapidly in recent years. Due to its high strength, low yield ratio and good forming properties, dual-phase steel has It is more and more favored by the automotive industry, and the proportion of applications in automobiles is increasing. Compared with cold-rolled dual-phase steel, galvanized dual-phase steel also has excellent anti-corrosion properties, which can ensure that automobiles have good corrosion resistance and perforation resistance. With the continuous improvement of the equipment capacity of hot-dip galvanizing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/02C23C2/06C23C2/40
CPCC22C38/02C22C38/04C22C38/06C21D8/0226C21D8/0236C23C2/06C23C2/40C21D2211/005C21D2211/008
Inventor 余灿生郑之旺周伟王敏莉郑昊青苏冠侨
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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