What is the yield strength of 4340 steel?
740-1860 MPa
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.
What does AISI 4340 mean?
AISI 4340 is defined as a heat treatable and low alloy steel which has 0.8% Cr, 0.2% Mo and 1.8% Ni as strengthening alloy elements. Compared with AISI 4140,it has higher strength and toughness,also it has very good fatigue resistance, wear resistance and atmospheric corrosion resistance.
How hard can you get 4340 steel?
Surface hardness achievable is 600 to 650HV. Atlas 4340 can be surface hardened to 58HRC (water quench) or surface hardened to between 53 to 55HRC (oil quench). Tempering at 200°C.
What type of steel is AISI 4340?
low alloy steel
AISI 4340 is a low alloy steel containing nominally 0.4% C, 0.8% Cr, 0.25% Mo and 1.8% Ni. Higher strength levels up to 150 KSI 0.2% PS may be achieved by suitable heat treatment. Often used in preference to AISI 4140 at the higher strength levels because of its better hardenability and improved CVN impact toughness.
What is 4340 normalized steel?
4340 is a nickel-chromium-molybdenum alloy steel known for its toughness and its ability to attain high strengths in the heat-treated condition. It has very good fatigue resistance.
What is the Rockwell hardness of 4340?
AISI 4340 Steel, normalized, 100 mm (4 in.) round
| Physical Properties | Metric | English |
|---|---|---|
| Hardness, Brinell | 321 | 321 |
| Hardness, Knoop | 348 | 348 |
| Hardness, Rockwell B | 99 | 99 |
| Hardness, Rockwell C | 35 | 35 |
Where is 4340 steel used?
4340 steel alloy is used primarily for structural applications such as aircraft landing gears. 4340 alloy steel is also used in the manufacturing of structural parts like gears, sprockets, chucks, molds, and more.
CAN 4340 steel be welded?
The most commonly welded heat-treatable steels are 4130, 4340, and 8630. However, any steel prefaced with a 41, 43, or 86 is considered heat-treatable.
Is 4340 a tool steel?
The mechanical properties of annealed AISI 4340 alloy steel are displayed in the following table….Mechanical Properties.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 745 MPa | 108000 psi |
| Yield strength | 470 MPa | 68200 psi |
| Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
How do you calculate yield strength of steel?
Yield strength is measured in N/m² or pascals. The yield strength of a material is determined using a tensile test. The results of the test are plotted on a stress-strain curve. The stress at the point where the stress-strain curve deviates from proportionality is the yield strength of the material.