Yes, because once oxygen continuously touches iron(steel). It begins to rust if not given proper care or good maintenance.

Yes, cold rolled and hot rolled steel both rust. Hot-rolled has a mill scale so that it can slow the rust from getting to the base steel quickly. The flash-rusted scale can be removed to reveal steel with minimal rust. Cold-rolled steel does not have that scale, so even a fine flash rust attacks the base metal.

Cold-rolled steel can still rust, although it is less likely to do so than hot-rolled steel. Cold-rolling steel involves a process in which the steel is passed through rollers at a lower temperature, which results in a harder and more durable steel that is less likely to corrode. However, even with the added durability, cold-rolled steel is not immune to rusting, and it can still be affected by environmental factors such as exposure to moisture and chemicals. To prevent rusting, it is important to protect cold-rolled steel from these elements through regular maintenance and the application of protective coatings.

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