Description of Pipes Made from Alloyed Steel AISI 4340
AISI/SAE 4340 is a chromium‐alloyed steel grade widely used in the oil and gas industry. It exhibits high strength and a favourable response to heat treatment, thereby achieving a measured balance of ductility and strength when treated.

Specifications for Pipes Made from Alloyed Steel AISI 4340
Element
|
Content (%)
|
Iron, Fe
|
95.195 – 96.33
|
Nickel, Ni
|
1.65 – 2.00
|
Chromium, Cr
|
0.700 – 0.900
|
Manganese, Mn
|
0.600 – 0.800
|
Carbon, C
|
0.370 – 0.430
|
Molybdenum, Mo
|
0.200 – 0.300
|
Silicon, Si
|
0.150 – 0.300
|
Sulphur, S
|
0.0400
|
Phosphorus, P
|
0.0350
|
Brinell Hardness
|
293 HB
|
Tensile Strength
|
1 014 MPa
|
Elongation at Break
|
19%
|
Reduction of Area
|
60.40%
|
Young’s Modulus
|
200 GPa
|
Young’s Modulus
|
159 GPa
|
Poisson’s Ratio
|
29%
|
Machinability
|
50%
|
Shear Modulus
|
78 GPa
|
Density
|
7.85 g/cm3
|
Melting Point
|
1 427 °C
|
Specifications: ASTM A 829 / A6 SAE J404, AMS 2252/ 2301/6359 SAE J404
Applications for AISI 4340 Alloyed Steel Pipe
- Aircraft Landing Gear Components:
- It is used in the manufacture of landing gear components, including struts and connecting rods. The material’s properties meet the specified data.
- Components for Vehicle Gearboxes:
- It is applied in automotive systems, in the production of components such as gears and shafts. Its measured mechanical properties satisfy engineering requirements.
- Forged Hydraulic Components:
- It is used in the forging of hydraulic devices. The measured strength and impact resistance enable operation under pressure.
- Crankshafts Made from High-Strength Forged Steel:
- It is employed in the manufacture of engine crankshafts. The tensile strength and fatigue resistance comply with performance criteria.
- Gears and Shafts for Power Transmission:
- They are used in the production of gears and shafts for power transmission systems. Their wear resistance and toughness meet operational specifications.
Packaging:
The AISI 4340 alloyed steel is handled carefully during storage and transport to maintain the product’s original condition.