Crown 8 (ER 80S-D2) is a premium low-alloy cut length TIG filler metal that contains ½ percent molybdenum (for increased strength) and high levels of manganese and silicon to provide good wetting and good rust and scale tolerance. The higher level of deoxidizers (Mn and Si) help to control porosity. Crown 8 (ER 80S-D2) will yield radiographic quality welds with excellent bead appearance in both ordinary and difficult-to-weld carbon and low alloy steels. Crown 8 is THE recommended TIG alloy for welding 4130 tubing up to .120" wall thickness. The combination of weld soundness and strength makes the Crown 8 suitable for single and multiple-pass welding of a variety of carbon and low-alloy, higher strength steels in both the as welded and postweld heat-treated conditions. Maximum mechanical properties are achieved when using a preheat and interpass temperature of 275OF minimum.