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HaiGang Yunyi
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Tianjin Haigang Steel Coil
Service first, quality assured. More dedicated and focused on crafting even better boards.
05
2020
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08
The difference between cold-hardened strip steel and cold-rolled strip steel
Cold-rolled strip steel is produced by pickling and cold rolling hot-rolled strip steel. It can be considered a type of cold-rolled strip steel.
Cold-rolled strip steel (annealed condition): Obtained by subjecting hot-rolled strip steel to pickling, cold rolling, bell-type annealing, leveling, and (finishing).
The main differences between the two are threefold:
1. In terms of appearance, cold-hardened strip steel generally has a slightly dark, glossy sheen compared to cold-rolled strip steel.
2. Cold-rolled strip steel exhibits better surface quality, structure, and dimensional accuracy than cold-hardened strip steel.
3. In terms of performance, cold-rolled strip steel—obtained directly from hot-rolled strip steel through the cold-rolling process—experiences work hardening during cold rolling, leading to an increase in yield strength and the retention of some residual internal stresses. This results in a noticeably “harder” appearance, hence the term “cold-hardened strip steel.”
Cold-rolled strip steel (in the annealed condition) is obtained by performing batch annealing on cold-hardened strip steel prior to coiling. After annealing, the work hardening phenomenon and internal stresses are eliminated (significantly reduced), resulting in a yield strength that approaches the level it had before cold rolling.
Yield strength: Cold-hardened strip steel is higher than that of cold-rolled strip steel (in the annealed state), making cold-rolled strip steel (in the annealed state) more suitable for stamping and forming.
The default delivery condition for general cold-rolled strip steel is the annealed state.
Cold-rolled strip steel, strip steel, coil sheet, galvanized strip steel
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We primarily produce various products including galvanized strip steel, pickled strip steel, and cold-rolled strip steel. These products are widely used in industries such as construction, mechanical manufacturing, automotive, and household appliances.
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Company address:
Shuangtang High-end Hardware Products Industrial Park, Jinghai District, Tianjin City
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Corporate email:
tjhaigang@tjhaigang.com
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