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Low-cost hot-galvanizing transformation-induced plasticity steel and preparation method thereof

A phase transformation-induced plasticity, hot-dip galvanizing technology, applied in hot-dip plating process, heat treatment equipment, heat treatment furnace, etc., can solve the problems of insufficient strength, easy blockage of mold nozzle, poor coating adhesion, etc. The effect of good quality, easy realization of process parameters and simple production control

Inactive Publication Date: 2020-03-13
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the production of hot-dip galvanized TRIP steel, there are often problems such as poor platability and poor bonding force of the coating. A lot of research has been done on the platability of TRIP steel at home and abroad, but there are few reports on industrial production.
[0004] In order to avoid problems such as galvanized surface quality, most of the galvanized transformation-induced plasticity steel sheet composition design uses high Al to replace or partially replace Si, because its strength cannot meet the requirements, and expensive alloying elements have to be added to improve the strength. At the same time Replacing silicon with aluminum can improve the platability of TRIP steel, but high aluminum content will cause some problems in steelmaking and hot rolling, such as found in the production process, when the aluminum content in TRIP steel is too high, the crystallization of continuous casting The spout is easy to clog
In addition, Al increases the Ac3 phase transition temperature, so that the annealing temperature has to be increased, increasing energy consumption

Method used

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  • Low-cost hot-galvanizing transformation-induced plasticity steel and preparation method thereof
  • Low-cost hot-galvanizing transformation-induced plasticity steel and preparation method thereof
  • Low-cost hot-galvanizing transformation-induced plasticity steel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] In this embodiment, the low-cost hot-dip galvanized phase-change-induced plasticity steel plate is based on the weight percentage content. The chemical composition of the control steel plate is C: 0.19%, Si: 1.3%, Mn: 1.7%, P: 0.010%, S: 0.002% , Al: 0.033%, and the balance is Fe.

[0027] The preparation method of the low-cost hot-dip galvanized phase transformation-induced plastic steel plate in this embodiment includes the following process flow:

[0028] Hot metal pretreatment→converter smelting→external refining→continuous casting→heating→controlled rolling and controlled cooling→coiling→pickling→continuous annealing→hot-dip galvanizing→pass finishing→functional inspection→packing for delivery;

[0029] Among them, the heating temperature of the controlled rolling and controlled cooling process is 1250°C, the rolling start temperature is 1100°C, the final rolling temperature is 920°C, laminar cooling is adopted after rolling, the cooling rate is 30°C / s, and the coi...

Embodiment 2

[0036] In this embodiment, the low-cost hot-dip galvanized phase-change-induced plasticity steel plate is based on the weight percentage content. The chemical composition of the control steel plate is C: 0.18%, Si: 1.4%, Mn: 1.8%, P: 0.013%, S: 0.001% , Al: 0.035%, and the balance is Fe.

[0037] The preparation method of the low-cost hot-dip galvanized phase transformation-induced plastic steel plate in this embodiment includes the following process flow:

[0038] Hot metal pretreatment→converter smelting→external refining→continuous casting→heating→controlled rolling and controlled cooling→coiling→pickling→continuous annealing→hot-dip galvanizing→pass finishing→functional inspection→packing for delivery;

[0039]Among them, the heating temperature of the controlled rolling and controlled cooling process is 1230°C, the rolling start temperature is 1080°C, the final rolling temperature is 900°C, laminar cooling is adopted after rolling, the cooling rate is 25°C / s, and the coil...

Embodiment 3

[0046] In this embodiment, the low-cost hot-dip galvanized phase-change-induced plasticity steel plate is based on the weight percentage content. The chemical composition of the control steel plate is C: 0.19%, Si: 1.4%, Mn: 1.7%, P: 0.012%, S: 0.003% , Al: 0.032%, and the balance is Fe.

[0047] The preparation method of the low-cost hot-dip galvanized phase transformation-induced plastic steel plate in this embodiment includes the following process flow:

[0048] Hot metal pretreatment→converter smelting→external refining→continuous casting→heating→controlled rolling and controlled cooling→coiling→pickling→continuous annealing→hot-dip galvanizing→pass finishing→functional inspection→packing for delivery;

[0049] Among them, the heating temperature of the controlled rolling and controlled cooling process is 1280°C, the rolling start temperature is 1120°C, the final rolling temperature is 950°C, laminar cooling is adopted after rolling, the cooling rate is 35°C / s, and the coi...

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Abstract

The invention relates to the field of transformation induced plasticity steel, in particular to low-cost hot-galvanizing transformation induced plasticity steel and a preparation method thereof. The steel plate comprises the following chemical components in percentage by weight: 0.1-0.3% of C, 0.4-2.0% of Si, 1.0-2.5% of Mn, 0.02% or below of P, 0.03% or below of S, 0.08% or below of Al, and the balance Fe. The method comprises the following technological processes of molten iron pretreatment, converter smelting, external refining, continuous casting, heating, controlled rolling and controlledcooling, coiling, acid pickling, continuous annealing, hot galvanizing, finishing, function inspection, and packaging and warehousing. The low-price C-Mn-Si alloy component design is adopted, and precious alloy elements such as Cr and Mo do not need to be added. By adopting a pre-oxidation process and proper dew point matching control, the platability of silicon-containing TRIP steel is improved.The technical problems of surface quality, mechanical properties and the like of the TRIP steel plate are solved by properly controlling cooling after plating.

Description

technical field [0001] The invention relates to the field of phase-change-induced plasticity steel, in particular to a low-cost hot-dip galvanized phase-change-induced plasticity steel and a preparation method thereof. Background technique [0002] Transformation-induced plasticity steel (TRIP steel) induces martensite nucleation under plastic deformation through the transformation-induced plasticity effect, and introduces transformation strengthening and plastic growth, which can improve strength and toughness. This type of steel is used as a steel plate for automobiles to reduce vehicle weight and fuel consumption, and at the same time, it can effectively resist plastic deformation during impact, thereby significantly improving the safety level of automobiles. Hot-dip galvanizing of phase change induced plasticity steel can obtain good corrosion resistance and prolong service life. [0003] At present, 590-780 hot-dip galvanized TRIP steel for structural parts and safety ...

Claims

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Application Information

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IPC IPC(8): C21D1/26C21D6/00C21D8/02C21D9/00C22C33/04C22C38/02C22C38/04C22C38/06C23C2/02C23C2/06C23C2/40
CPCC21D1/26C21D6/005C21D6/008C21D8/0221C21D9/0081C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C23C2/02C23C2/06C23C2/40
Inventor 李春诚刘宏亮王亚东王忠东孙忠斌高兴昌冯岗
Owner BENGANG STEEL PLATES
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