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A kind of hot-dip galvanized steel sheet with a yield strength of 550mpa and its production method

A technology of hot-dip galvanized steel sheet and yield strength, applied in hot-dip galvanizing process, coating, metal material coating process, etc. Strength fluctuation and other problems, to achieve the effect of good strength and toughness, high strength, improved strength and toughness

Active Publication Date: 2021-10-29
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the fact that the existing hot-dip galvanized steel sheets cannot meet the requirements of high strength and elongation at the same time, and cannot adapt to the use requirements of high strength and high toughness; at the same time, the existing production methods will cause large fluctuations in the strength of galvanized steel sheets, resulting in product output In order to solve the problem of instability, the present invention provides a hot-dip galvanized steel sheet with a yield strength of 550MPa and its production method. By controlling the C element content in the steel sheet and adding elements such as Mn, Ti, Nb, and Cu to strengthen the steel sheet, the P, S and other elements that are unfavorable to toughness, reduce Si and other elements that are unfavorable to surface quality, and cooperate with reasonable steelmaking, hot rolling, cold rolling and hot-dip galvanizing processes, so that hot-dip galvanized steel sheets have both high strength and high hardness. High elongation and high plastic strain ratio, and high surface quality requirements; and through the control of the process, the strength of the produced steel plate will not fluctuate greatly, which improves the product output rate and reduces the cost

Method used

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  • A kind of hot-dip galvanized steel sheet with a yield strength of 550mpa and its production method
  • A kind of hot-dip galvanized steel sheet with a yield strength of 550mpa and its production method
  • A kind of hot-dip galvanized steel sheet with a yield strength of 550mpa and its production method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The chemical composition of the steel plate in this example is: C 0.008%, Si≤0.009%, Mn 0.19%, P0.012%, S 0.016%, Als 0.022%, Ti 0.032%, Nb 0.043%, N 0.0028%, O 0.0019 %, Cu0.030%, Cr 0.010%, and the rest are iron and other impurities. The finishing temperature of hot rolling is 874°C, the coiling temperature is 581°C; the reduction rate of cold rolling is 82%; when galvanizing, the annealing temperature T of the RTF section is 607°C, the annealing time t is 43s, and the skin elongation is 0.5% , Tensile straightening elongation 0.5%.

Embodiment 2

[0065] The chemical composition of the steel plate in this example is: C 0.010%, Si≤0.006%, Mn 0.10%, P0.008%, S 0.010%, Als 0.005%, Ti 0.001%, Nb 0.060%, N 0.0026%, O 0.0016 %, Cu0.045%, Cr 0.022%, and the rest are iron and other impurities. The finishing temperature of hot rolling is 892°C, the coiling temperature is 599°C; the reduction rate of cold rolling is 86%; when galvanizing, the annealing temperature T of the RTF section is 612°C, the annealing time t is 32s, and the skin elongation is 0.7% , Tensile straightening elongation 0.3%.

Embodiment 3

[0067] The chemical composition of the steel plate in this example is: C 0.006%, Si≤0.008%, Mn 0.30%, P0.009%, S 0.005%, Als 0.070%, Ti 0.080%, Nb 0.001%, N 0.0015%, O 0.0017 %, Cu0.060%, Cr 0.040%, and the rest are iron and other impurities. The finishing temperature of hot rolling is 909°C, the coiling temperature is 612°C; the reduction rate of cold rolling is 91%; when galvanizing, the annealing temperature T of the RTF section is 624°C, the annealing time t is 46s, and the skin elongation is 0.9% , Tensile straightening elongation 0.1%.

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Abstract

The invention discloses a hot-dip galvanized steel sheet with a yield strength of 550 MPa and a production method thereof, belonging to the technical field of metal materials. The chemical composition weight percent of the hot-dip galvanized steel sheet of the present invention is: C 0.006%~0.010%, Si≤0.01%, Mn 0.10~0.30, P≤0.015%, S≤0.040%, Als 0.005%~0.070%, Ti 0.001% ~0.080%, Nb 0.001%~0.060%, N≤0.0030%, O≤0.0020%, Cu 0.030%~0.060%, Cr 0.010%~0.040%, and the rest are iron and other impurities. By controlling the content of C element in the steel plate, adding Mn, Cr, Al, Cu and other elements, and controlling the content of the added elements, the strength of the steel can be improved. Ti and Nb are also added to the steel, and the content of the two elements satisfies the formula 0.050%≤Ti+Nb≤0.120%. The two elements can not only increase the strength, but also make the toughness better, which is the most economical and effective way to improve the properties of steel. Through the combination of the two elements, the ferrite grain size can be further refined, and the strength and toughness of the steel plate can be improved at the same time, so that the strength and toughness of the steel can be well matched, and the requirements of yield strength and elongation can be met at the same time.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a hot-dip galvanized steel sheet with a yield strength of 550 MPa and a production method thereof. Background technique [0002] Galvanized steel sheet is a welded steel sheet with a hot-dip galvanized or electro-galvanized layer on the surface. It is generally widely used in construction, home appliances, vehicles and ships, container manufacturing, and electromechanical industries. According to the production and processing methods, it can be divided into the following categories: (1) Hot-dip galvanized steel sheet, the thin steel sheet is immersed in a molten zinc tank to make a thin steel sheet with a layer of zinc on its surface. (2) Alloyed galvanized steel sheet is also manufactured by hot-dip method. After leaving the tank, it is immediately heated to about 500°C to form an alloy film of zinc and iron. (3) Galvanized steel plate. (4) Single-sided and double-side...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/20C22C38/26C22C38/28C22C1/03C23C2/26C23C2/06C21C7/072C21D8/02
CPCC21C7/072C21D8/0226C22C1/03C22C38/004C22C38/20C22C38/26C22C38/28C23C2/06C23C2/26
Inventor 王占业王滕李雄杰杨平孙霖李伟刚张百勇李超周红兵张喜秋何峰
Owner MAANSHAN IRON & STEEL CO LTD
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