Classification and performance introduction of steel coils

Hot rolled coil, namely hot rolled coil, takes slab (mainly continuous casting slab) as raw material, and is made into strip steel by rough rolling unit and finishing rolling unit after heating.

The hot steel strip from the last finishing mill is cooled to the set temperature through laminar flow, rolled into steel strip coil by coiler, and the cooled steel strip coil is processed into steel plate, flat coil and slitting steel strip products through different finishing operation lines (leveling, straightening, cross cutting or longitudinal cutting, inspection, weighing, packaging and marking, etc.) according to different needs of users.

Material: Q235B, Q345B, SPHC, 510L, Q345A, Q345E

Cold rolled coil is commonly used in steel industry, which is different from hot rolled coil. It refers to the steel strip that is directly rolled into a certain thickness with rolls at room temperature and rolled into a whole coil with a winder. Compared with hot rolled coil, cold rolled coil has bright surface and high finish, but it will generate more internal stress, and it is often annealed after cold rolling.

Classification: SPCC SPCD SPCE

Galvanized steel coils refers to the surface treatment technology of plating a layer of zinc on the surface of metal, alloy or other materials for beauty, rust prevention, etc. Now the main method is hot galvanizing.

The production process of hot-dip galvanized sheet mainly includes: raw plate preparation → pre plating treatment → hot dip plating → post plating treatment → finished product inspection, etc. According to the habit, it is often based on the pretreatment method.

Galvanium steel coils: the aluminum zinc plated steel plate is composed of aluminum zinc alloy structure, which is composed of 55% aluminum, 43% zinc and 2% silicon solidified at 600 ℃. The whole structure is composed of aluminum iron silicon zinc, forming a compact quaternary crystal.

Aluminum zinc plated steel sheet has many excellent characteristics: strong corrosion resistance, which is 3 times of that of pure zinc plated steel sheet; There are beautiful zinc flowers on the surface, which can be used as building exterior panels. Its characteristics are: corrosion resistance (the corrosion resistance of "aluminized zinc coated steel coil" is mainly due to the protection function of aluminum. When zinc is worn, aluminum will form a layer of dense aluminum oxide, preventing corrosion resistant substances from further corroding the interior) Heat resistance Economy (because the density of 55% AL Zn is smaller than that of Zn, the area of aluminum zinc plated steel plate is more than 3% larger than that of steel plate under the same weight and the same thickness of gold plating layer).

The post-treatment of aluminum zinc plated plate includes: DRY drying; OIL oiling; Chromate chromate passivation; AFP/Galva clean fingerprint resistance; Non Gr, Gr free, cadmium free and fingerprint resistant.

Color coils, color steel coils coated with various colors of organic coatings, are named after this, and are referred to as color coated coils for short.

In addition to the zinc layer protection, the organic coating on the zinc layer covers and protects the color coated steel strip using hot galvanized steel strip as the base material, preventing the steel strip from rusting. The service life is about 1.5 times longer than that of the galvanized strip.

The color coated roll has light weight, beautiful appearance and good corrosion resistance, and can be directly processed. It is mainly used in the construction industry, household appliances industry, electrical appliances industry, furniture industry and transportation industry.

The paint used for color coating roll shall be suitable resin according to different use environment, such as polyester silicon modified polyester, PVC plastic sol, PVDC, etc. Users can choose according to the purpose.