Our Vari-Wall THERMLX material has a unique chemistry that is a meticulous blend of alloying elements including molybdenum, vanadium, and chromium. Our material is designed to air harden as it cools from high temperature TIG welding. The alloy blend produces a fine grain microstructure with superior strength and toughness. Vari-Wall THERMLX is the ONLY steel in the industry manufactured to AMS Aerospace Standards. This means our raw material is inspected and certified to aircraft standards at every step, insuring the cleanest defect free steel on the planet. Maximum tensile strength up to 1200 MPa.