REGOL 600 is tough, abrasion resistant, hardened steel piping system. Offsets, sweeps, elbows and fittings are fabricated from the same tough special analysis steel. REGOL 600 is one of the most cost-effective materials for transport of abrasive media available in the industry today. A special heat-treating process produces approximately 3/16" depth of 600 BHN (hardness) on the inside of the pipe. The outer pipe wall is held to approximately 250 BHN which is a key factor in weldability and formability of REGOL 600