Aluminum-silicon plated steel plate for hot-press molding and its fabrication method

A technology of hot pressing and aluminum-silicon plating, applied in hot-dip plating process, coating, metal material coating process, etc., can solve the problems of coating liquefaction, substrate exposure, peeling, etc., to achieve high corrosion resistance and heat resistance The effect of good performance and surface quality

Active Publication Date: 2013-01-02
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For aluminum-silicon-coated steel sheets for hot-press forming, the sheet needs to be heat-preserved and formed at a temperature above 800°C, which requires that the coating itself not only have high heat resistance, but also have good formability, while the existing aluminum-silicon When coating products are hot-pressed above 800°C, coating liquefaction, peeling, adhesion to molds and other undesirable phenomena often occur. This may be due to the high content of Si

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The chemical composition of the steel plate is (mass percentage): C: 0.21%, Si: 0.40%, Mn: 0.8%, P: 0.007%, S: 0.002%, Al: 0.016%, Cr: 0.3%, Ti: 0.03 %, B: 0.005%, N: 0.003%, and the balance is Fe and unavoidable impurities.

[0037] The heating rate of the steel plate in the pre-oxidation furnace is 40°C / s, the final temperature is controlled at 600°C, the atmosphere is a mixed atmosphere of gas + air, and the excess coefficient is 0.9.

[0038] The protective atmosphere content in the reduction furnace is (volume percentage): H 2 : 40%, the balance is N 2 .

[0039] The chemical composition of the plating solution in the hot-dip aluminum pot is Al: 98% to 99%; Si: 0.8%, Ce: 0.3%, and the balance is unavoidable impurities such as Fe elements.

[0040] The dew point in the furnace is controlled at -30°C. The annealing temperature is 850°C, and the bath temperature is 720°C. The temperature of the plate brought into the pot is 680°C, and the dipping time is 4s.

[...

Embodiment 2

[0045] The chemical composition of the steel plate is (mass percentage): C: 0.14%, Si: 0.24%, Mn: 0.5%, P: 0.007%, S: 0.002%, Al: 0.016%, Cr: 0.23%, Ti: 0.02 %, B: 0.005%, N: 0.003%, and the balance is Fe and unavoidable impurities.

[0046] The heating rate of the steel plate in the pre-oxidation furnace is 60°C / s, the final temperature is controlled at 650°C, the atmosphere is a mixed atmosphere of gas + air, and the air excess coefficient is 1.1.

[0047] The chemical composition of the plating solution in the hot-dip aluminum pot is Al: 97% to 98%; Si: 2%, Ce: 0.25%, and the balance is unavoidable impurities such as Fe elements.

[0048] The protective atmosphere content in the reduction furnace is (volume percentage): H 2 : 30%, the balance is N 2 .

[0049] The dew point in the furnace is controlled at -40°C. The annealing temperature is 800°C, and the bath temperature is 700°C. The temperature of the plate brought into the pot is 680°C, and the dipping time is 3s. ...

Embodiment 3

[0054] The chemical composition of the steel plate is (mass percentage): C: 0.22%, Si: 0.4%, Mn: 1.2%, P: 0.007%, S: 0.002%, Al: 0.016%, Cr: 0.5%, Ti: 0.02 %, B: 0.005%, N: 0.003%, and the balance is Fe and unavoidable impurities.

[0055] The heating rate of the steel plate in the preoxidation furnace is 70°C / s, the final temperature is controlled at 700°C, and the atmosphere is 5% H by volume 2 +N 2 +H 2 O, the dew point is controlled at +30°C.

[0056] The chemical composition of the plating solution in the hot-dip aluminum pot is Al: 97% to 98%; Si: 2%, Ce+La: 0.2%, and the balance is unavoidable impurities such as Fe elements.

[0057] The protective atmosphere content in the reduction furnace is (volume percentage): H 2 : 50%, the balance is N 2 .

[0058] The dew point in the furnace is controlled at -40°C. The annealing temperature is 850°C, and the bath temperature is 750°C. The temperature of the plate brought into the pot is 730°C, and the dipping time is 3s...

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Abstract

The invention discloses an aluminum-silicon plated steel plate for hot-press molding and its fabrication method. The steel plate is plated with an aluminum-silicon plating on its surface, wherein the plating contains (by weight percentage) aluminum 96-98, silicon 1.3-3.8 and rare earth 0.1-0.3, thickness of an alloy layer is smaller than or equal to 5 Mum, and silicon content in the alloy layer is controlled at 3-6 wt%. The fabrication method comprises pre-oxidizing a steel plate via an NOF, wherein reduction furnace atmosphere contains H2 20-50 vol% and N2 in balance, dew point in the furnace is controlled at (-20)-(-60) DEG C., annealing temperature is 800-850 DEG C., temperature of a plating solution is 680-750 DEG C., temperature of the steel plate, while being placed in an aluminum pot, is 650-750 DEG C., and immersion plating time is 2-5 s; taking the steel plate out of the aluminum pot, and rapidly cooling at speed of no smaller than 120 DEG C./s until solidifying point of aluminum-silicon alloy is achieved; and cooling to 420-480 DEG C. at speed of 30-100 DEG C./s, and performing overaging annealing at 350-450 DEG C. for 10-300 s.

Description

technical field [0001] The invention belongs to the field of continuous hot-dip coating of steel strips, in particular to an aluminum-silicon-coated steel plate for hot-press forming and a manufacturing method thereof. Background technique [0002] At present, although high-strength steel sheets and their galvanized products have greatly improved the service strength and service life of steel sheet products, it is difficult to ensure good formability of higher-strength steel sheets, such as super-strength steel sheets with a strength of not less than 1500MPa, and the production process is difficult to solve. The problem of shape fixity. [0003] In order to solve the forming problem of higher strength steel plates, a forming process at high temperature has attracted widespread attention, which can well coordinate high strength and high formability. Publication No. JP2000-234153 discloses a process of forming a steel sheet while heating and using the heat generated during fo...

Claims

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Application Information

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IPC IPC(8): C23C2/12C23C2/40C22C38/32C21D1/76C21D1/26
Inventor 杨洪刚李锋吕家舜
Owner ANGANG STEEL CO LTD
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