Description of AISI 4140 Alloy Steel Round Bar
AISI 4140 has high ductility and can be formed using conventional techniques in the annealed condition. Because of its toughness that is superior to any other plain carbon steels, it requires more pressure or force to forming it. AISI 4140 can be used for a wide variety of applications where greater toughness and wear resistance is needed over lower carbon grades. Typical applications include strippers, holder blocks, mold bases, and supporting tools.
Specifications of AISI 4140 Alloy Steel Round Bar
|
Grade
|
Cr %
|
Mo %
|
C %
|
Mn %
|
P % (max)
|
S % (max)
|
Si %
|
|
4140
|
0.80-1.10
|
0.15-0.25
|
0.38-0.43
|
0.75-1.00
|
0.035
|
0.04
|
0.15-0.35
|
|
Properties
|
Metric
|
Imperial
|
|
Tensile strength
|
655 MPa
|
95000 psi
|
|
Yield strength
|
415 MPa
|
60200 psi
|
|
Bulk modulus (typical for steel)
|
140 GPa
|
20300 ksi
|
|
Shear modulus (typical for steel)
|
80 GPa
|
11600 ksi
|
|
Elastic modulus
|
190-210 GPa
|
27557-30458 ksi
|
|
Poisson's ratio
|
0.27-0.30
|
0.27-0.30
|
|
Elongation at break (in 50 mm)
|
0.257
|
0.257
|
|
Hardness, Brinell
|
197
|
197
|
|
Hardness, Knoop (converted from Brinell hardness)
|
219
|
219
|
|
Hardness, Rockwell B (converted from Brinell hardness)
|
92
|
92
|
|
Hardness, Rockwell C (converted from Brinell hardness. )
|
13
|
13
|
|
Hardness, Vickers (converted from Brinell hardness)
|
207
|
207
|
|
Machinability (based on AISI 1212 as 100 machinabilities)
|
65
|
65
|
Applications of AISI 4140 Alloy Steel Round Bar
Typical uses for 4140 include:
- Gears:
- Utilized in the fabrication of gears for machinery and automotive systems, where 4140 steel's high strength and wear resistance contribute to the durability and efficient operation of the gears.
- Crankshafts:
- Found in the manufacturing of crankshafts for engines, particularly in the automotive and aerospace industries, taking advantage of 4140 steel's robust properties for reliable and high-performance engine operation.
- Suspension Systems:
- Applied in the production of components for suspension systems in vehicles, providing the necessary strength and toughness to withstand dynamic loads and ensure stability.
- Bulldozer Blades:
- Used for constructing bulldozer blades due to its excellent combination of hardness and toughness, making the blades resistant to wear and impact during heavy-duty earthmoving applications.
- Oil and Gas Equipment:
- Employed in the manufacturing of components for oil and gas exploration and extraction equipment, where the steel's strength and resistance to harsh environmental conditions are crucial for reliable performance.
Packaging:
Our AISI 4140 Alloy Steel is carefully handled during storage and transportation to preserve the quality of our product in its original condition.
FAQs
What are the key properties of AISI 4140 Alloy Steel?
AISI 4140 offers excellent fatigue resistance, good machinability, high tensile strength, and good resistance to wear and abrasion, especially after heat treatment.
Can AISI 4140 Alloy Steel be heat treated?
Yes, AISI 4140 is heat-treatable and can achieve a range of mechanical properties, such as high strength and hardness, through processes like quenching, tempering, and normalizing.
Is AISI 4140 Alloy Steel corrosion-resistant?
While AISI 4140 has moderate corrosion resistance, it is generally used in conditions where additional protection like plating or coating is required, especially in harsh environments.
How should AISI 4140 Alloy Steel be welded?
AISI 4140 can be welded using standard welding techniques (TIG, MIG, etc.), but preheating and post-weld heat treatment are recommended to minimize the risk of cracking and to maintain its mechanical properties.
