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The conventional design is most commonly used when running multiple tube and pipe sizes made of mild steel with a T/D ratio (thickness divided by diameter) of between 3-8%. If the gauge thickness is below 3% or above 8%, other styles of design are recommended, such as Edgeform, Versatile Edgeform, or W-Style. The single-radius design is very forgiving during setup, since it is not as critical that it be centered like the other breakdown styles.
A taller side roll profile may be needed when using this design, in order for the tube to be properly shaped to enter the fin passes. This is important in order to avoid overworking the strip and inducing instability.
The conventional style is a single-radius design and is only used when specified by the customer or if existing sets on the mill run conventional design, since most demand more range of gauges and material types on one set. It has several limitations:
Even with its limitations, the conventional style is commonly used in many applications and provides a good quality product where it can be used.