4140 High Tensile Steel
Products Description 4140 Chemical Composition Physical Properties 4140 Mechanical Properties In terms of its chemical composition, 4140 steel contains a balanced combination of alloying elements such as chromium, molybdenum, and manganese. These elements work synergistically to enhance its...
Description
Products Description
4140 Chemical Composition
| Element | Content (%) |
|---|---|
| Chromium, Cr | 0.80 - 1.10 |
| Manganese, Mn | 0.75 - 1.0 |
| Carbon, C | 0.380 - 0.430 |
| Silicon, Si | 0.15 - 0.30 |
| Molybdenum, Mo | 0.15 - 0.25 |
| Sulfur, S | 0.040 |
| Phosphorous, P | 0.035 |
| Iron, Fe | Balance |
Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm3 | 0.284 lb/in³ |
| Melting point | 1416°C | 2580°F |
4140 Mechanical Properties
| 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) | 25.70% | 25.70% |
| 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. Value below normal HRC range, for comparison purposes only) | 13 | 13 |
| Hardness, Vickers (converted from Brinell hardness) | 207 | 207 |
| Machinability (based on AISI 1212 as 100 machinability) | 65 | 65 |
In terms of its chemical composition, 4140 steel contains a balanced combination of alloying elements such as chromium, molybdenum, and manganese. These elements work synergistically to enhance its hardness, toughness, and resistance to wear and corrosion. The precise proportion of these elements is carefully controlled during the manufacturing process to ensure consistent and reliable performance.
The manufacturing of 4140 high tensile steel involves advanced techniques and strict quality control measures. It often undergoes processes like heat treatment, which can further improve its mechanical properties by optimizing the microstructure of the steel. This results in a material with enhanced strength, ductility, and toughness, making it suitable for a variety of demanding applications.
When it comes to applications, 4140 steel is widely used in the automotive industry for manufacturing components such as crankshafts, axles, and gears. Its high tensile strength and good fatigue resistance make it capable of withstanding the cyclic loads and stresses experienced in these parts. In the aerospace industry, it is used in the fabrication of structural components and landing gear due to its strength and reliability. Additionally, in the oil and gas industry, 4140 steel is employed in the production of drill collars and wellhead equipment, where it can endure the harsh operating conditions and high pressures.
In conclusion, 4140 high tensile steel is a vital material in modern industry. Its unique combination of properties and versatility make it an essential choice for a wide range of applications. Continued research and development in the field of steel manufacturing are likely to further improve the performance of 4140 steel and expand its use in new and emerging industries, contributing to technological advancements and economic growth.
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