H-A Industries H-A Industries was formed when HY-Alloy stress was acquired in 1993. H-A is a custom heat treat and bar/tube machining operation. See our heat treating section to learn about our capabilities. A. M. Castle & Co Castle Metals A. M. Castle Canada A. M. Castle Singapore A. M. Castle Shanghai Castle Metals Mexico Castle Metals France Castle Metals UK Castle Metals Aerospace H-A Industries Oliver Steel
