Cold hardening rolled steel: using hot rolled steel coil as raw material, after removing the oxide scale by pickling cold rolling, the finished product is cold hardening rolled steel, due to cold hardening caused by continuous cold deformation, the strength and hardness of rolled hard coil increases, the toughness and plastic index decreases, so the stamping performance will deteriorate, can only be used for simple deformation of parts.
| Surface finish | characteristic | Average surface finish (boundary value: 0,8mm) |
| Special flat | b | Ra ≤ 0,4 µm |
| flat | g | Ra ≤ 0,9 µm |
| Matt | m | 0,60 µm ˂ Ra ≤ 1,9 µm |
| rough | r | Ra ≤ 1,6 µm |
Cold hardening rolled steel can be used as raw material for hot-dip galvanizing plant, because hot-dip galvanizing unit is set with quenching line. The hard roll weight is generally 6~13.5 tons. The cold hardening rolled steel is continuously rolled on the hot pickling roll at normal temperature. The inner diameter is 610mm.
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