... Bar 40Mn2This is a medium-carbon manganese steel of quenched and tempered steel strength, ductility and wear resistance are higher ... and heat treatment process performance is also good,. This steel has a sensitivity of white spots, cold plastic deformation, ... used to manufacture heavy load conditions, such as shafts, crankshafts, axles, piston rod, worm, lever, rod load bolts, screws, reinforcement ...