What is the application of AISI 4140 steel?

AISI 4140 is a medium hardenable steel, after heat treatment has good strength and good comprehensive mechanical properties, good manufacturability, high yield rate.

Heat treatment: Quenched and tempered
AISI 4140 steel equivalent
DIN B.S. AISI/SAE
1.7225 708M40 4140
AISI 4140 steel is used to manufacture forgings that require higher strength and larger quenched and tempered sections than 35CrMo steel, such as large gears for locomotive traction, supercharger transmission gears, rear axles, highly loaded connecting rods and spring clips. Drilling pipe joints and salvage tools for oil deep wells below 2000m in length, and can be used for bending machine molds, etc.
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