Gnee Steel (tianjin) Co., Ltd.
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Cold Rolled Steel Coil Production Process
Since there is no heating during the production process, there are no defects such as pits and scales that often occur in hot rolling, and the surface quality is good and the finish is high. Moreover, the dimensional accuracy of cold-rolled products is high, and the performance and structure of the products can meet some special requirements, such as electromagnetic properties, deep drawing properties, etc.
Cold rolling:
use hot-rolled steel coils as raw materials, pickle and remove scale, and then carry out cold rolling. The finished product is hard rolled coils. The strength, hardness, and toughness of hard rolled coils increase due to cold hardening caused by continuous cold deformation. 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 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.
| GRADE | Yield Strength Mpa | Tensile strength Mpa | Elongation A80mm % | Impact test | ||
| TemºC | AkvJ | |||||
| SPCC | ≥195 | 315~430 | ≥33 | |||
| Q195 | ≥195 | 315~430 | ≥33 | |||
| Q235-B | ≥235 | 375~500 | ≥25 | 20 | ≥27 | |
