Full Hard Galvanized Steel Coil Gi Coils

PRODUCT DESCRIPTION

Galvanized Steel coils are divided into cold-rolled Galvanized Steel Coil and hot-rolled galvanized Steel Coils, that is to say, soft Galvanized Steel Sheet in coils and hard galvanized steel coils.
hot rolled
Hot rolling is to use slab (mainly continuous casting slab) as raw material, and after heating, it is made into strip steel by rough rolling unit and finishing rolling unit. The hot steel strip coming out of the last rolling mill of finishing rolling is cooled to the set temperature by laminar flow, and rolled into steel strip coils by the coiler. The cooled steel strip coils undergo different finishing operations according to the different needs of users. Wire (leveling, straightening, cross-cutting or slitting, inspection, weighing, packaging and marking, etc.) processed into Steel Plate, flat coil and slitting steel strip products. To put it simply, a billet is heated and rolled several times, then trimmed and corrected to become a steel plate. This is called hot rolling.
cold rolled
Cold rolling: use hot-rolled steel coils as raw materials, pickle to remove scale, and then carry out continuous cold rolling. The finished product is hard rolled coils. Due to cold hardening caused by continuous cold deformation, the strength, hardness, and toughness of hard rolled coils increase. The plastic index decreases, so the stamping performance will deteriorate, and it can only be used for parts with simple deformation. Hard-rolled coils can be used as raw materials for hot-dip galvanizing plants, because all hot-dip galvanizing units are equipped with annealing lines. The weight of hard-rolled coils is generally 6-13.5 tons, and the steel coils are continuously rolled at room temperature for hot-rolled pickled coils. The inner diameter is 610mm.
Product features: Because it has not been annealed, its hardness is very high (HRB is greater than 90), and its machinability is extremely poor. It can only perform simple directional bending less than 90 degrees (perpendicular to the coiling direction).
To put it simply, cold rolling is processed and rolled on the basis of hot rolled coils. Generally speaking, it is a process of hot rolling---pickling---cold rolling.
Cold rolling is processed from hot-rolled plates at normal temperature. Although the steel plate will heat up due to rolling during the processing process, it is still called cold rolling. Due to the continuous cold deformation of hot rolling, the mechanical properties are relatively poor and the hardness is too high. It must be annealed to restore its mechanical properties, and it is called hard rolled coil without annealing. Hard-rolled coils are generally used to make products that do not need to be bent or stretched. If the thickness is less than 1.0, hard-rolled coils are lucky to be bent on both sides or four sides.

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