AISI 4140 quenched & tempered qt steel round bar

4140 steel is a king of Chromium-Molybdenum steel material with medium hardenability. It is a general purpose high-tensile steel with medium strength level and good impact properties. As a special steel bar factory, we can produce 4140 steel round bar, 4140 square bar, 4140 flat bar, 4140 hexagonal steel bar. We can also supply different delivery condition of 4140 steel bars such as 4140 hot rolled steel bar, 4140 cold drawn steel bar, 4140 peeled steel bar, 4140 turned steel bar, 4140 centerless ground and polished steel bar as well as 4140 annealed steel bar, 4140 normalized steel bar, 4140 quenched and tempered steel bar, that is to say, 4140 qt steel bar or 4140 q&t steel bar.

4140 Steel reacts well in heat treatment and it is easy to process under heat treatment conditions. This material provides many desirable properties such as good strength and wear resistance, excellent toughness, good ductility and resistance to high-temperature stresses.

1. 4140 steel equivalent grade:

2. 4140steel chemical composition:

 
3. 4140 steel mechanical properties:
(Different Property canbe catched by adjusting Quenched and Temepering tempreture and time )

4. 4140 steel applications:

high strength stud bolt, threaded rods, wind power bolt, prestressed anchor bolts, post stressed anchor bolt, steel tie rod, tie bar, tension rod, tension bar etc. Shaft, axle shaft, crankshaft, shaft for sleeve, linear shaft, pump shaft, rotor shaft, sensor shaft, spline shaft, drive shaft, mandrel shaft, transmission shaft, screw rod etc. CNC machines, precision CNC machines etc. Ejector pins and Ejector rods
 

1. High strength and toughness.
2. Great property of quenching and can be deep hardened.
3. Less tempering brittleness tendency.
4. Great machining performance under high temperature and nice appearance after machining.
5. Good performance in weld ability.
6. Excellent performance in impact absorption, such as where the hammer may bounce back and has barely any damage caused upon impact.