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The conventional flat hot-rolling process comprises several major steps, which are slab reheating, hot rolling and coiling.8 During reheating, steel slabs are heated by combustion of natural gas in a reheat furnace to the desired temperatures.
Oxide scale generated on the steel surface during and after finishing rolling is classified as tertiary scale,8,10 which is usually coiled with the strip and retained to room temperature.
During cooling after coiling, the scale may grow further if oxygen is available and will also undergo structural changes.
The final scale structures developed on the strip are affected greatly by the coiling temperature and coil-cooling conditions.11,12
One typical example is the oxidation of hot-rolled strip after it is coiled.12
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