When we use 304 stainless steel pipes, sometimes we find that the brightness of the surface is not enough. This will not only affect the appearance of 304 stainless steel pipes, but also affect its use effect. Therefore, 304 stainless steel pipe manufacturers share information about affecting the surface of 304 stainless steel pipes. Brightness factor.
1. The oil content in the emulsion is too high. The emulsion used in the cold rolling mill is composed of water, emulsifier and oil. The emulsion has both cooling and smoothing effects, while the oil will be cracked into carbon at high temperatures. If the carbon cannot be removed in real time, it will be accumulated on the surface of the 304 stainless steel pipe and will form an indentation after being flattened by a flat engine. Therefore, the oil content in the emulsion is one of the important factors that affect the quality of 304 stainless steel pipe.
2. A lot of carbon black is attached to the inner wall of the maintenance cover. Because of the high oil level in the emulsion, carbonization will occur after annealing in the bell furnace. As a result, carbon accumulates on the inner wall of the maintenance cover and is added with the annealing furnace. Carbon black is added. If it is not cleared in real time, under certain conditions, the carbon black will be scattered on other steel coils. After processing, the carbon will adhere to the surface of the 304 stainless steel pipe strip.
3. Lack of purge capacity in HNX annealing furnace. Poor recovery function. Because the purge sensitivity of the air-rest in the HNX annealing furnace is only about 20-25 cubic meters (standard)/h, it is heated and in the process. Gasified oil is often difficult to clean. The outer ring of the steel coil still shows black bands early. Contaminate the appearance of the 304 stainless steel pipe. In addition, because the general hydrogen content of this maintenance gas is only 3% to 6%, most of it is nitrogen. Therefore, the amount of carbon cannot be recovered. Because nitrogen is an inert gas. It cannot be combined with the vaporized gas, so it can only be blown out, and carbon accumulation cannot be avoided.
4. Stove and convection plate are not cleaned. Some carbon black, oil stains, dust, etc. will also accumulate on the surface of the same stove and convection plate. If the furnace is not cleaned up immediately before loading, the carbon black, oil stains and dust will also be scattered on the steel coils, affecting the appearance quality.
5. The emulsion on the 304 stainless steel pipe is not clean when it is blown off. The outlet of the cold tandem mill is equipped with a purge installation to blow the remaining emulsion and oil on the surface of the 304 stainless steel pipe.