In continuous mandrel rolling mills and extrusion mills a number of piercing mandrels and mandrel bars are required to manufacture different sizes of seamless steel tubes.

During the mill process these mandrels and bars are subjected to high temperatures, shock loading and high mechanical forces. This leads to heavy wear on the affected surfaces and significant material loss.

With hardened and chromed surfaces basic wear resistance can be achieved but using Hunger Ultraplate coating the mandrel life will be multiplied several times.

• Lengths up to 18 m
• Surfaces hardened with hard chrome layer or Ultraplate layer