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The main intent behind controlled rolling is always to refine grain structure and, thereby, to boost both the strength and toughness of steel within the as-hot-rol1ed condition. If your survey is made of the growth of controlled rolling, it could be seen that controlled rolling is made up of three stages: (a) deformation in the recrystallization region at high temperatures; (b) deformation in the non-recrystallization region in just a low temperature range above Ar3; and (c) deformation within the austenite-ferrite region.

It is stressed that the importance of deformation inside the nonrecrystallization region is within dividing an austenite grain into several blocks by the roll-out of deformation bands there. Deformation inside the austenite-ferrite region gives a mixed structure made up of equiaxed grains and subgrains after transformation and, thereby, it increases further the strength and toughness.

The fundamental difference between conventionally hot-rolled and controlled -rolled steels lies in the truth that the nucleation of ferrite occurs exclusively at austenite grain 34dexppky within the former, even though it takes place in the grain interior in addition to at grain boundaries within the latter, resulting in a far more refined grain structure. In Galvanized Steel Coils/Hot Dip Galvanized Steel Coil a crystallographic texture develops, which then causes planar anisotropies in mechanical properties and embrittlement within the through -thickness direction.

The second is shown to end up being the main reason for the delamination which appeared within the fractured Charpy specimens. Fundamental areas of controlled rolling, like the recrystallization behaviour of austenite, the retardation mechanism of austenite recrystallization on account of niobium, microstructural changes accompanying deformation, factors governing strength and toughness, etc., are reviewed. The practice of controlled rolling in plate and strip mills is outlined.