Tin-zinc hot dipping fuel-tank high-strength steel plate with good corrosion resistance and manufacturing method thereof

Abstract

The invention discloses a tin-zinc hot dipping fuel-tank high-strength steel plate with good corrosion resistance and a manufacturing method thereof. The steel plate comprises the following elements of: by weight, 0.02-0.10% of C, Si being less than or equal to 0.30%, 0.20-2.50% of Mn, P being less than or equal to 0.10%, S being less than or equal to 0.05%, 0.05-0.50% of Cr, 0.02-1.00% of Ni, 0.02-0.50% of Cu, 0.02-0.50% of Mo, Ti being less than or equal to 0.15%, Nb being less than or equal to 0.15%, and the balance Fe and other unavoidable impurities. The steel plate is prepared by process route of smelting, casting, hot rolling, cold rolling and continuous tin-zinc hot dipping. During the continuous annealing process, a steel band is heated to a two-phase region and is insulated for 10-100s while the temperature is 700-850 DEG C; then, the steel band is rapidly cooled to 300+ / -50 DEG C at the cooling rate of 10-100 DEG C / s, is insulated for 0-150s, undergoes tin-zinc hot dipping at the temperature of 280+ / -30 DEG C, and is finally air-cooled to room temperature after the plating process. The invention has the following advantages and effects: the disadvantage that a traditional lead-containing coated steel plate is harmful to the environment and a IF steel plate has low strength is overcome, and simultaneously the high-strength steel plate provided by the invention has good corrosion resistance and formability.

Description

technical field [0001] The invention belongs to the technical field of hot-dip plating of steel plates, and in particular relates to a high-strength steel plate for hot-dip tin-galvanized fuel tanks with good corrosion resistance and a manufacturing method thereof. Background technique [0002] Steel plates for fuel tanks are a special class of materials, most of which are surface-treated steel plates. The properties required for this type of steel plate are: 1) Corrosion resistance This not only requires resistance to external atmospheric, coastal and other environmental corrosion, but also must be resistant to fuel and moisture corrosion inside the fuel tank. 2) Stamping formability Fuel tanks are mostly located under the car body and in the narrow space, and the shape is often very complex, so the motherboard is required to have excellent mechanical properties and surface lubrication properties. 3) Weldability In the manufacturing process of the fuel tank, seam welding b...

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Problems solved by technology

2) Stamping and forming fuel tanks are mostly located under the vehicle body and in the narrow space, and the shape is often very complex, so the motherboard is required to have excellent mechanical properties and surface lubrication properties

Although the cost of hot-dip galvanized steel is low and the corrosion resistance is good, zinc is not a good material for the corrosion resistance of the fuel inside the fuel tank. Zinc will be corroded by water or deteriorated gasoline, which will easily clog the fuel filter. white rust

In addition, the zinc in the zinc coating tends to stain the Cu electrode, so the welding performance is poor

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