Cold-rolled hot-dipped Al-Zn steel plate for kinescope explosion-proof band and production method thereof

Abstract

The invention relates to a cold-rolled hot-dipped Al-Zn steel plate for a kinescope explosion-proof band and a production method thereof, and solves the technical problems of low strength and easy powdering in current cold-rolled hot galvanized steel plates and the problems of complex manufacturing process and high production cost in microalloy dual phase steel plates and cold-rolled high strength Al-Zn steel plates. The production method includes: conducting smelting according to components, carrying out molten iron desulphurization, converter top-bottom combined blowing, steel ladle bottom argon blowing or LF furnace refining, protective slag Ar blowing protective casting, slab reheating furnace heating, descaling, rough rolling, finish rolling, and reeling in order to obtain a hot rolled steel coil, then performing uncoiling again, and conducting pickling, cold rolling, horizontal continuous annealing furnace annealing, hot dipping, drawing straightening and reeling, thus obtaining a finished product. The cold-rolled hot-dipped Al-Zn steel plate provided by the invention has a single-side hot-dipped Al55Zn43Si1.6 layer with a thickness of 35-45g / m<2>, a single-side chromate-free passivation coating film with a thickness of less than 1micrometer, and yield strength of 420-500MPa.

Description

technical field [0001] The invention relates to a cold-rolled hot-dip galvanized steel sheet and a production method thereof, in particular to a cold-rolled hot-dip galvanized steel sheet used for a picture tube explosion-proof belt and a production method thereof. Background technique [0002] At present, kinescope TVs and display screens are mainly used in some developing countries and special industries. The domestic market demand for thin plate steel used in the manufacture of kinescope explosion-proof belts is about 5,000 tons per year. In China, only Baosteel and Wuhan Iron and Steel produce steel for explosion-proof belts. [0003] Materials for explosion-proof belts need heat resistance, corrosion resistance, and good weldability. The processing process of the new generation of explosion-proof tape includes: cutting the explosion-proof tape of the finished roll into suitable small rolls, then cutting into suitable sections, and making 4 to 6 convex hulls at the same ...

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Problems solved by technology

[0009] The purpose of the present invention is to provide a cold-rolled hot-dip galvanized steel sheet used for the explosion-proof belt of a picture tube and a production method thereof, so as to solve the existing cold-rolled hot-dip galvanized steel sheet with low strength, easy pulverization and micro-alloy dual-phase The technical problems of complex manufacturing process and high production cost of steel plate and cold-rolled high-strength aluminum-coated steel plate

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