What kind of material is 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 the HRC of 4340?
4340 has high strength, ductility, toughness, creep resistance, and fatigue resistance relative to most other steels. High degrees of hardenability are achievable in the alloy, with HRC hardnesses ranging from 24 to 53 depending on the heat treatment.
What is the name for a 4340 steel?
AISI 4340 steel is a medium carbon, low alloy steel known for its toughness and strength in relatively large sections. AISI 4340 is also one kind of nickel chromium molybdenum steels.
How strong is 4340 steel?
4340 High Tensile Steel
Chemical Composition (Base Material) | ||
---|---|---|
Min. % | ||
Tensile Strength (Min.) | 850 | 1230 |
Tensile Strength (Max.) | 1000 | 1380 |
0.2% Proof Stress Mpa (Min.) | 665 | 1080 |
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 you heat treat 4340 steel?
Heat Treatment AISI 4340 alloy steel is heat treated at 830°C (1525°F) followed by quenching in oil.
How hard can you heat treat 4340?
Induction or Flame Hardening Atlas 4340 can be surface hardened to 58HRC (water quench) or surface hardened to between 53 to 55HRC (oil quench). Tempering at 200°C.
Is 4340 heat treatable?
AISI 4340 alloy steel is a heat treatable and low alloy steel containing chromium, nickel and molybdenum. It has high toughness and strength in the heat treated condition.
Is 4340 steel ductile or brittle?
The 4340 alloy is ductile down to -150F. The casting engineer has to select a castable steel alloy that meets the performance requirements with a brittle transition temperature below -50F.
Will 4340 steel rust?
Is 4340 Steel Corrosion Resistant? The corrosion resistance of steel is determined by the amount of chromium content present. 4340 steel boasts of chromium content that ranges from a minimum of 0.6 up to 1.40%. Its corrosion resistance capabilities are pretty decent, but, it’s not the best.
What is the difference between 4140 and 4340 steel?
However, 4340 has more carbon, while 4140 has more chromium. One of the most significant differences between the two metals is the inclusion of nickel in 4340 steel, which accounts for the metal’s greater strength and fracture toughness.
Is 4340 steel corrosion resistant?
AISI 4340 Steel is highly resistant to atmospheric corrosion because of its combined alloy elements of chromium, molybdenum,nickel and manganese which can not only improve the strength and hardenability of steel, but also improve corrosion resistance.