Conventional Method

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) 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:

  • Other design methods, such as edgeform and “W-style” allow easier setup to design and chart figures
  • The top roll center areas only completely form the strip to the bottom radius in the working area of the roll, leaving the earlier pass radius in the strip edges
  • The side roll radii will not fill out correctly, due to the rest of the strip edge radii being flatter, having been formed in the earlier passes

Even with its limitations, the conventional style is commonly used in many applications and provides a good quality product where it can be used.

  • conventional_1.png
  • conventional_2.png


On-Time Delivery


First Time Performance

Still Searching For Answers?

Roll over to our Worlds Leading Resource Center

Search our Resources

No One Else Does What We Do

Roll form tooling tested at our facility or yours

Illustration of three linked gears small medium and large. Learn More

Detailed setup package & technician's testing remarks

Illustration of a piece of paper with lines on it to indicate writing. Learn More

Tooling drawing fully detailed

Illustration of a pencil. Learn More

Technicians available to troubleshoot at your facility

Illustration of a technician bust wearing a hat with with a wrench below the technician. Learn More

Tooling shipped in foam-filled wooden crates

Illustration of a box with all 4 top flaps open. Learn More

If it's not right, we'll make it right. Guaranteed.

Time to Roll Profits!

Have a technical question?

Need a quote from one of our performance specialists?

Simply contact us here or call and get answers 24/7.

Contact Us (888) 953-9400

Roll-Kraft hosts regional Tube and Pipe Mill seminar in Waverly, Nebraska

After a long dry spell of over two years due to the pandemic, Roll-Kraft hosted its first regional seminar of the 2022 season in Waverly, Nebraska on May 3rd.

➤ Read More

Roll-Kraft Tube and Pipe Live Training Seminar on May 3

Join us on May 3rd, 2022 for our live Tube & Pipe training seminar.

➤ Read More

In Memory: Bret Molnar (1959-2021)

It is with very heavy hearts that we announce the passing of our beloved lifelong teammate, Bret Molnar.

➤ Read More