4340 steel and 4140 steel
Otai exports various tool steel and alloy to more than 30 countries from Europe and America, Middle East and Asia. Our steel materials meet DIN / ASTM / EN / JIS etc different international standards. Today we will talk about 4340 steel and 4140 steel’s difference and its application.
4340 alloy structural steel belongs to gear steel.
It is used for important tempering parts that require good toughness, high strength, and large size, such as heavy machinery high-load shaft, turbine shaft with a diameter greater than 250mm, helicopter rotor shaft, turbojet engine turbo shaft, blade, high-load transmission parts, crankshaft fasteners.Gear, etc. It can also be used for rotor shaft and blade with an operating temperature over 400℃. It can also be used to make important parts with special performance requirements after nitriding treatment, which can be used for ultra-high strength steel after low-temperature tempering or isothermal quenching.
4140 steel, the steel has good workability, machining deformation of small, anti-fatigue performance is quite good.
On the hardenability of steel, 4140 heat treatment has good strength and good comprehensive mechanical properties, good manufacturability, high yield. The highest temperature is 427 degrees Celsius. 4140 strength, high hardenability, and good toughness, quenching deformation of small, high temperature creep rupture strength, and high. It is used for manufacturing forgings with higher strength and larger tempering cross section than 35CrMo steel, such as big gear for locomotive traction, supercharger drive gear, rear axle, connecting rod and spring clamp with great load, also can be used for drilling pipe joint and fishing tool of oil deep well below 2000m, and can be used for bending machine mold, etc.
Otai does not act as material handler. We possess proprietary technology and continuously iterates. We undertake every order to end and solve customer’s problems without any hesitation on responsibility. When customized special steel is hard to get, Otai settles satisfactorily completely.
