Classification and application of hot-dip galvanized sheets

Hot-dip galvanized sheets are mainly used in construction, home appliances, automobiles, machinery, electronics, light industry and other industries.

Commonly used steel types of hot-dip galvanized sheets include: general commercial coil (CQ), structural galvanized sheet (HSLA), stamped galvanized sheet (DQ), deep-drawing hot-dip galvanized sheet (DDQ), and bake-hardened hot-dip galvanized sheet (BH), dual phase steel (DP), TRIP steel (phase transformation induced plasticity steel), etc. There are three types of galvanizing annealing furnaces: vertical annealing furnace, horizontal annealing furnace and vertical and horizontal annealing furnace.

Generally, there are two cooling methods for hot-dip galvanized sheet cooling towers: air cooling and water cooling.

Classification
1. Hot-dip galvanized sheet. A thin steel sheet is immersed in a molten zinc bath so that a layer of zinc adheres to the surface. It is mainly produced by the continuous galvanizing process, that is, the rolled steel plate is continuously immersed in a plating bath containing molten zinc to make galvanized steel plate; alloyed galvanized steel plate. This kind of steel plate is also made by the hot dip method, but it is heated to about 500°C immediately after coming out of the tank to form an alloy film of zinc and iron. This kind of galvanized sheet has good paint adhesion and weldability. 2. Hot-dip galvanizing can be divided into two types: in-line annealing and out-of-line annealing according to different annealing methods, which are also called protective gas method and flux method respectively.

The difference between hot-dip galvanized sheet and electro-galvanized sheet

Hot-dip galvanized sheet is hot-rolled galvanized sheet, and cold-dip galvanized sheet is cold-rolled galvanized sheet.

In terms of materials, the composition of the two galvanized sheets is basically similar. The difference is that the cold galvanized sheet is thinner than the hot galvanized sheet, has better surface quality, and the process is more complex. The price is also higher.

From a technical point of view, the steel is sent from the cast billet to hot rolling, and rolled into a plate with a certain thickness, such as a thickness of about 10mm. If the user does not have higher requirements for the surface, thickness, and mechanical strength of the plate, the finished product can be processed, such as Galvanizing and the like are sold directly as hot plates. If there are higher requirements for the plates, then the hot-rolled plates will be sent to the cold rolling line for re-processing. After pickling, annealing, re-rolling and other processes, the products are obtained Thinner, smoother surface and better mechanical properties of cold-rolled plates.