Home page

About the chemical reaction that occurs in galvanized coils

2023-09-11

Galvanized coils are chemically reacted between steel and liquid zinc by dipping, thus attaching a thin layer of zinc to the surface of the steel. Galvanized coil is the same thing, of course, is the rolls of steel sheet put in the soaking plus a made. Cold rolled coil refers to the steel coil obtained after rolling in a cold mill, or cold hardened coil. In practice, we usually after the cold rolled rolled and the next process of steel coils are collectively referred to as cold rolled coil.

NOF section oxidizing atmosphere and protective gas dew point is too high, the air-fuel ratio is unreasonable, the hydrogen flow rate is low, there is oxygen infiltration in the furnace, the temperature of the strip steel into the pot is low, the furnace pressure of the RWP section is low and the furnace door suction, the furnace temperature of the NOF section is low, the oil and grease evaporation is not exhaustive, the zinc pot has a low content of aluminum, the speed of the unit is too fast, reduction is not sufficient, the residence time in the zinc liquid is too short, and the plating layer is too thick. Use the equipment to cut the galvanized coil into plates only.

Forklift or crane to put the galvanized coil on the shelf and then through the transmission of equipment, flattening, shearing and become. The width is standard width of one meter, one meter two and a half, one meter five three, the length is arbitrary. Because they all leave a large crater on the surface of the workpiece, and all check for higher hardness. For this reason you only in Rockwell hardness HRB and Vickers hardness HV choose one of them.

Internationally, developed countries began to develop new types of pipe, and successively banned galvanized pipe. China's Ministry of Construction and other four ministries and commissions also issued a clear from 2000 to ban galvanized pipes as water supply pipes, cold water pipes in new neighborhoods have been rarely used galvanized pipes, some neighborhoods of the hot water pipes used galvanized pipes. In the production line between the trough and the trough are perforated straight through and the solution without any carry out or overflow. The production process consists of a circulating system for each process, and the solutions in each tank, i.e., acid and alkali solution, electroplating solution, polishing and passivation solution, etc., are only recycled and reused without leaking or discharging to the outside of the system.

■

What are the properties of color coated coils in applications?

2023-09-11