Nickel Molybdenum (Ni-Mo) steel grades, widely recognized in the 46xx and 48xx series, are highly regarded for their outstanding carburizing properties and exceptional core toughness. The addition of nickel significantly enhances ductility and fatigue resistance, while molybdenum provides deep hardenability and stabilizes the microstructure against high-temperature wear. This combination creates an ideal alloy for heavy-duty case-hardened components, including transmission gears, rock-bit bearings, continuous threading applications, and specialized industrial fasteners requiring a highly wear-resistant surface over a shock-resistant core.
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