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A kind of high-strength and high-toughness hot-dip aluminized steel plate and its manufacturing method

A technology of hot-dip aluminum plating and manufacturing method, which is applied in hot-dip plating process, coating, metal material coating process, etc., can solve the problems of low strength and low resource utilization rate of hot-dip aluminized steel plate

Active Publication Date: 2017-07-21
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the above-mentioned problems and deficiencies and provide a high-strength and high-toughness hot-dip aluminum-coated steel sheet and its manufacturing method to solve the problems of low strength and low resource utilization of existing hot-dip aluminum-coated steel sheets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Chemical composition of steel: C 0.15%, Si0.55%, Mn1.60%, P≤0.020%, S≤0.020%, Al0.02%, Ti0.04%, the rest is Fe and some unavoidable impurity elements.

[0037] Manufacturing process: After smelting, casting, hot-rolling, pickling and cold-rolling the steel of the above composition, the steel plate is hot-dip aluminized in the continuous hot-dip aluminum production line, the heating temperature is 880°C, the holding temperature is 880°C, and then the Cool at a cooling rate of 10°C / s to 700°C and enter the plating solution, and then cool to 500°C at a rate of 30°C / s after exiting the plating solution, then air-cool for 5 seconds, and then cool to 200°C at a rate greater than 20°C / s. After the air-cooling temperature drops to about 150°C, it is water-quenched to below 50°C. The composition of the plating solution is: 90% Al+10% Si.

[0038] The structure is: 10% F + 45% M + 40% B + 5% residual A, and the retained austenite is distributed between martensite and bainite gra...

Embodiment 2

[0041] The chemical composition of steel is: C 0.15%, Si0.01%, Mn1.10%, P≤0.020%, S≤0.020%, Al0.90%, V0.10%, B0.002%, the rest is Fe and some Unavoidable impurity elements.

[0042] Manufacturing process: After smelting, casting, hot-rolling, pickling and cold-rolling the steel of the above composition, the steel plate is hot-dip aluminized in the continuous hot-dip aluminum production line, the heating temperature is 850°C, the holding temperature is 840°C, and then the Cool down to 690°C at a cooling rate of 15°C / s and enter the plating solution, cool to 550°C at a rate of 35°C / s after exiting the plating solution, then air cool for 8 seconds, and then cool to 240°C at a rate greater than 15°C / s, After the air-cooling temperature drops to about 150°C, it is water-quenched to below 50°C. The composition of the plating solution is: 92% Al+8% Si.

[0043] The structure is: 20% F + 35% M + 35% B + 10% residual A, and the retained austenite is distributed between martensite and...

Embodiment 3

[0046] Chemical composition of steel:: C0.65%, Si1.70%, Mn5.00%, P≤0.020%, S≤0.020%, Al0.02%, Nb0.05%, Ca0.001%, the rest is Fe and some Unavoidable impurity elements.

[0047] Manufacturing process: After smelting, casting, hot rolling and pickling of the steel with the above components, the steel plate is hot-dip aluminized in the continuous hot-dip aluminum production line within 48 hours. The heating temperature is 900°C and the holding temperature is 890°C. In the temperature range of 650°C to 750°C, use nitrogen and oxygen mixed gas containing 1% oxygen for pre-oxidation, and then reduce after 750°C. The plating solution is then cooled to 210°C at a rate of 40°C / s, and then water quenched to below 50°C after the air cooling temperature drops to about 150°C. The composition of the plating solution is: 88% Al+12% Si.

[0048] The structure is: 10% F + 65% M + 10% B + 15% residual A, and the retained austenite is distributed between martensite and bainite grains or inside...

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Abstract

The invention provides a high-strength high-toughness hot-dip aluminized steel plate. The steel plate comprises the following components in percentage by weight: 0.15%-0.65% of C, 0.50%-3.50% of Si, 1.10%-7.00% of Mn, less than or equal to 0.50% of P, less than or equal to 0.30% of S, 0.02%-5.00% of Al, and at least one of less than or equal to 0.50% of V, less than or equal to 0.20% of Ti, less than or equal to 0.20% of Nb and less than or equal to 0.005% of B, and the balance Fe and some inevitable impurity elements; the steel plate further contains at least one of less than or equal to 0.004% of Ca and less than or equal to 0.004% of Mg. A method for manufacturing the high-strength high-toughness hot-dip aluminized steel plate comprises the following steps: heating a steel plate on a continuous hot-dip aluminizing production line to a range of 750-950 DEG C and preserving heat of the steel plate at a temperature ranging from 750 to 950 DEG C; heating and preserving heat of the steel plate on the continuous hot-dip aluminizing production line at a temperature within an austenitic range, cooling the steel plate to a range of 680-700 DEG C before going into an aluminum-silicon plating solution, or slowly cooling the steel plate to a two-phase region of austenite and ferrite and then rapidly cooling the same to a range of 680-700 DEG C before going into the aluminum-silicon plating solution, and after the steel plate is taken out of the plating solution, carrying out rapid air cooling to a bainite transformation region, followed by rapid cooling to a temperature between an Ms point and an Mf point of steel. The stele has the yield strength of greater than 700MPa, the tensile strength of greater than 900MPa and the elongation of greater than 10%; and energy sources are saved.

Description

technical field [0001] The invention belongs to the field of manufacturing hot-dip aluminum-coated steel sheets, in particular to a high-strength and high-toughness hot-dip aluminum-coated steel sheet and a manufacturing method thereof. Background technique [0002] Hot-dip aluminum-silicon-coated steel is to immerse the pretreated steel material in the molten aluminum-silicon alloy, keep it warm for a certain period of time, and coat the surface with a layer of aluminum-silicon alloy coating. Aluminum-silicon coated steel plate has the characteristics of high temperature resistance, corrosion resistance, etc., and has a good surface appearance, and is especially suitable for use in high temperature environments. Al-Si coated steel plate has good high temperature resistance. When the temperature is lower than 450°C, the Al-Si coated steel plate will maintain a bright appearance, and it will not start to oxidize and change color until it is above 500°C. Due to the mutual dif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C22C38/12C22C38/14C23C2/12C23C2/40C23F17/00
Inventor 吕家舜李锋周芳杨洪刚刘仁东王铁军
Owner ANGANG STEEL CO LTD
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