4140MC is a metal cored wire designed forwelding and build up onmild&low alloy steels having a smooth stable arc transfer, spatter free, excellent bead contour, with a high deposition rate and nearly free of slag weld bead. This wire is formulated to weld flat and horizontal which has deoxidizers that helps where mill scale may be present. This metal cored wire is typical used on dies, forgings, castings and other base metals where heat treating is required. Preheat and interpass of 500-650° F is found on AISI 4140 grades of base metal followed by slow cool and post weld heat treating to required hardness.