Abstract
This chapter discusses manganese–molybdenum steel having higher molybdenum concentration. It also describes the chemical composition and the mechanical, welding, and physical properties of this steel. It is a steel of very similar composition to En 16 but is with higher molybdenum content and so possessing higher hardenability. In small sections, it may have tensile strengths of the order of 60 tons/sq. in., and in fairly large sections, the strength of the order of 50 tons/sq. in may be obtained. These strengths of manganese–molybdenum steel is combined with good ductility and resistance to shock. This steel is used for general engineering components, crankshafts, connecting rods, axle shafts, levers, bolts, wheel studs, etc. The machinability of this steel, when heat treated to 50 to 60 tons/sq in., is approximately 50 percent of that of mild steel, and when heat treated to 60 to 70 tons/sq. in., is approximately 40 percent of that of mild steel.
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