Vertical drying and curing process for non-oriented silicon steel low-temperature chromium-free environment-friendly insulating coating

Abstract

The invention provides a vertical drying and curing process for a non-oriented silicon steel low-temperature chromium-free environment-friendly insulating coating. The process comprises the following steps that after cold-rolled non-oriented silicon steel is annealed in a galvanizing unit, the cold-rolled non-oriented silicon steel is coated with the low-temperature chromium-free environment-friendly insulating coating by using a coating machine, and drying and curing are conducted by using a vertical drying furnace to produce a cold-rolled non-oriented silicon steel product, specifically, the thickness of the low-temperature chromium-free environment-friendly insulating coating is 0.8-1.0 micron; the furnace temperature of each section of the vertical drying furnace is as follows that the furnace temperature of a first heating section is 420-450 DEG C, the furnace temperature of a second heating section is 460-490 DEG C, the furnace temperature of a third heating section is 500-530 DEG C, the outlet plate temperature of the third heating section is 200-240 DEG C, and the outlet plate temperature of a cooling section is 60-65 DEG C; and the heating time of each section of the vertical drying furnace is as follows that the heating time of the first heating section, the second heating section and the third heating section are 3.5-4 seconds correspondingly. By the adoption of the process, it can be guaranteed that a steel belt coating is uniform, the coating of a final product has excellent insulativity, corrosion resistance, adhesiveness, punching performance, weldability and heat resistance, the requirements of downstream procedures are met, the product percent of pass can be further increased, waste products are reduced, and smooth production is guaranteed.

Description

technical field [0001] The invention belongs to the non-oriented silicon steel insulating coating drying and curing technology, in particular to a non-oriented silicon steel low-temperature chromium-free environmental protection insulating coating vertical drying and curing technology. Background technique [0002] Cold-rolled non-oriented silicon steel is an important raw material for household appliances, various types of motors, electronic products and other industries in my country. The quality of its surface coating directly affects the punching, stacking and insulation resistance of motors or motor cores. Silicon steel coating is required to have excellent insulation, corrosion resistance, adhesion, punching, weldability and heat resistance. [0003] At present, the most widely used non-oriented silicon steel coatings in China are semi-organic chromium-containing coatings. Although this type of chromium-containing coatings meets various performance requirements of non-...

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Problems solved by technology

[0003] At present, the most widely used non-oriented silicon steel coatings in China are semi-organic chromium-containing coatings. Although this type of chromium-containing coatings meets various performance requirements of non-oriented silicon steel coatings, hexavalent chromium is toxic and will pollute water sources. harm

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