Abstract
This chapter discusses manganese–molybdenum steel. It describes the chemical composition, mechanical properties, and welding and physical properties of this steel. The steel can be used in parts requiring a tensile strength of up to about 55 tons/sq.in. in medium sections and about 65 tons/sq.in. in others, and where good shock resistance is desired. The steel is also suitable for low-temperature applications. It is typically used to make motor car crankshafts, connecting rods, axle shafts, and other vehicle parts. When hardened and tempered to 50–60 tons/sq.in., the machinability of this steel is approximately 50 percent of that of mild steel (En. 3). When it is heat treated to 60–70 tons/sq.in., the machinability is approximately 40 percent of that of mild steel. En. 16M is a special free machining quality with sulfur addition to aid machinability.
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