We deliver mandrel bars of up to 28 m in length and up to 365 mm in diameter to nearly all manufacturers of seamless tubes. A mandrel bar is used to roll a pre-pierced steel billet to produce a tube blank (the preliminary seamless tube).
We produce these mandrel bars in-house on one of the largest forging machines as well as on a state-of-the-art rolling mill, including straightening and machining units specifically designed for the “mandrel bar” long product.
We can supply you with mandrel bars made from general-purpose hot work steels and specialty steels tailored to suit the various tube rolling methods and made to withstand individual stresses in the following versions, all based on your request:
- Finish-machined and chrome-plated
- Finish-machined and oxidized
- Pre-machined, i.e. quenched and tempered, peeled