- Source: 4340 steel
4340 steel is an ultra-high strength steel classified a medium-carbon, low-alloy steel. 4340 steel has high strength, ductility, toughness, creep resistance, and fatigue resistance relative to most other steels. Hardness ranging from 24 to 53 HRC can be achieved, depending on the heat treatment.
Chemical Composition
Mechanical Properties
The mechanical properties of 4340 are highly dependent on the heat treatment. 4340 can commonly have yield strengths of 740-1860 MPa, tensile strengths of 860-1980 MPa, elongations of 11-23%, and plane strain fracture toughness of 53-110 MPa√m.
The machinability of 4340 steel in the annealed condition is rated at 57%, based on AISI1212 (Free cutting, .12% C) as 100% speed reference.
Applications
Applications of 4340 steel include heavy shafting, fasteners, aircraft, automotive, and hydraulic systems.
Equivalent Grades
References
Kata Kunci Pencarian:
- Mardjono Siswosuwarno
- Ekonomi Ukraina
- 4340 steel
- Carbon steel
- 125 mm smoothbore ammunition
- M549
- Tool steel
- Strain hardening exponent
- Hydrogen embrittlement
- Liquid metal embrittlement
- Laser metal deposition
- Steel grades
