A kind of single-sided electrogalvanized steel for automobile fuel tank and production method thereof

Abstract

The invention discloses a steel for single-sided electrogalvanizing automobile fuel tanks, and the steel comprises the following components in percentage by weight: less than or equal to 0.0015% of C, less than or equal to 0.018% of Si, 0.05-0.20% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.05-0.07% of Ti, 0.02-0.06% of Als, less than or equal to 0.003% of N, and the balance of iron and inevitable impurities. A method for producing the steel comprises the following steps: 1) carrying out smelting and continuous casting on raw materials so as to obtain a blank; carrying out conventional heating on the blank, and then carrying out hot rolling on the blank; carrying out conventional water cooling on the blank until the blank is at a coiling temperature, and coiling the blank; carrying out cold rolling on the blank; carrying out continuous annealing on the blank; finishing the blank; carrying out conventional pickling, scrubbing electrolytic degreasing, and rinsing on the blank; carrying out a gravity-method single-sided electrogalvanizing process on strip steel. According to the invention, on the premise of ensuring that the mechanical properties of the steel are as follows: the yield strength is 120-170 MPa, the tensile strength is 270-330 MPa, the plastic strain ratio r90 is greater than or equal to 2.1, the work hardening index n90 is greater than or equal to 0.22, and the percentage of elongation A80mm is greater than or equal to 42%, and the steel is directly contacted with the coating surface of gasoline, so that the steel is excellent in corrosion resistance and high in surface quality, the non-coating surface of the steel has a good welding performance, and therefore a seal welding process is conveniently performed on the upper and lower shells of a fuel tank subjected to stamping.

Description

technical field [0001] The invention relates to a steel for fuel tanks and a production method thereof, in particular to a steel for galvanized fuel tanks and a production method thereof, in particular to steel for single-sided electrogalvanized automobile fuel tanks and a production method thereof. Background technique [0002] Single-sided electrogalvanized deep-drawing steel for automobile fuel tanks uses continuous annealing ultra-deep-drawn plates as the substrate, and single-sided electroplating technology is used in the electrogalvanizing process. It is the best deep-drawing performance among cold-rolled products at present, and has stable performance and no Excellent aging and molding properties. For example, if the grade is DC06+ZE ultra-deep drawing, although the research on electro-galvanized steel sheets and production methods, the corresponding literature and patents have been consulted at home and abroad, but it mainly focuses on the ordinary double-sided elect...

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Problems solved by technology

[0004] The purpose of the needle of the present invention is to provide a single-sided electrogalvanized automobile fuel tank that not only has excellent stamping formability, but also has excellent anti-corrosion performance and welding performance in order to solve the problem that the prior art does not have both anti-corrosion and welding properties. Steel and its production method

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