ASTM 4340 belongs to the American Standard high strength alloy structural steel, the implementation standard is ASTM A29/A29M-04 or SAE J404. ASTM 4340 round steel corresponds to the Chinese domestic 40CrNi2Mo alloy structural steel. ASTM 4340 round steel has high strength, toughness, outstanding harden-ability and stability against overheating. It is mainly used for the manufacture of large size important tempered parts, such as heavy machinery high load shafts, machine turbine shafts with diameters greater than 250mm, helicopter rotor shafts, crankshaft fasteners, gears, etc.

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