Production method for ultra-thin cold-rolled enamelled steel strips

Abstract

The invention discloses a production method for ultra-thin cold-rolled enamelled steel strips. The production method is characterized in that the ultra-thin cold-rolled enamelled steel strips have thicknesses of 0.18-0.20mm, and are obtained through the steps of carrying out hot-rolling production for cold-rolled materials, chlorohydric acid pickling, primary cold-rolling, primary intermediate annealing, and secondary cold-rolling to prepare ultra-thin cold and hard steel strips, and then carrying out smoothing and texturing, rewinding and tension losing, secondary intermediate annealing, and strip shape straightening. According to the method, the products have excellent deep drawing properties, and have no fish-scaling phenomenon, and moreover, with the adoption of a 950mm single-stand six-roll reversible cold-rolling mill, single-stand smoothing and texturing, severe-convection full-hydrogen bright bell-type annealing furnace annealing, the equipment is simplified, and the products achieve high-accuracy and ultra-thin requirements; the surfaces are smooth, and free from bonding, chromatic aberration, black spots, dots, oil stain and other defects; and the production method achieves the quality requirements of ultra-thin deep-drawn cold-rolled enamelled steel strips, is suitable for the fields of kitchen sanitary ware and ovens, water heater liners, decoration panels and the like, and has a broad market prospect.

Description

technical field [0001] The invention relates to the improvement of the preparation method of the enamel steel strip, in particular to an extremely thin cold-rolled steel strip for enamel with a thickness of 0.18-0.20 mm, good deep drawing performance, smooth surface, straight plate shape, and no scaling phenomenon. production method. Background technique [0002] Enamel has the advantages of excellent corrosion resistance, wear resistance, high temperature resistance, easy cleaning, smooth surface, and no static electricity. It is widely used in light industry, household appliances, metallurgy, chemical industry, construction and other industries. There are many types of products made of enameled steel. Enamel steel is used in kitchen utensils, sanitary ware, barbecue ovens, water heater liners, kiosks, highway signs, building decoration panels, chemical reaction tanks, etc., and plays a very important role in the national economy. [0003] With the development of the natio...

AI Technical Summary

Problems solved by technology

Although the above production methods have high phosphorus explosion resistance or ultra-deep drawing performance, they also have the following disadvantages: the surface quality of the steel strip for enamel is prone to streaks, color difference, dark spots, pitting, oil stains and other defects, and the shape of the strip is prone to There are wave-shaped defects such as edge waves and rib waves. In terms of thickness, it is easy to have defects of over-thickness, ultra-thinness, and uneven thickness. In terms of physical properties, defects in stamping and cracking are prone to occur. The existence of the above-mentioned defects affects the normal use of customers; and through the current method, It is possible to roll enamelled steel strips with a thickness of 0.3mm-3.0mm, but it is impossible to produce enamelled steel strips with good deep drawing performance, no scaling phenomenon, smooth surface, straight plate shape, and a thickness of 0.18mm-0.2mm. Cold rolled steel strip

Another example is that Chinese patent CN101082107B discloses a "precision stainless steel ultra-thin strip rolling method". Although products with a thickness of 0.1 to 0.2 mm can be produced, rolling and annealing in a continuous annealing furnace using a 20-high rolling mill requires a large investment. , the problem of poor stamping performance of the product

None of the above methods mentioned the use of a single-stand six-high reversing cold rolling mill for secondary cold rolling, single-stand texturization after secondary cold rolling, heavy coil unloading, and secondary annealing in a strong convection all-hydrogen bright bell annealing furnace. method of producing enamelled steel

Moreover, the cold-rolled steel strip for enamel is rolled by a cold tandem rolling mill, and it only goes through one annealing process, which cannot meet the thickness requirements of the ultra-thin enamel plate.

At present, there is no method of cold rolling with a single-stand six-high reversing cold rolling mill, single-stand texturing after the second cold rolling, unloading of heavy coils, and secondary annealing in a strong convection all-hydrogen bright bell annealing furnace to produce extremely thin thickness. Report on the production method of cold-rolled steel strip for enamel with excellent deep drawing performance