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.