SAE- AMS 6381 is a type of tool steel that is commonly used in manufacturing processes. It is a high-quality steel known for its strength and durability, making it an ideal choice for applications requiring wear and tear resistance. This blog post will discuss everything you need to know about SAE – AMS 6381, from its composition to its properties and uses.
What is AMS 6381?
AMS 6381 (also known as SAE-AISI 4140 Alloy Steel) is a specialized grade of steel with specific properties ideal for applications in the aerospace and defence industries. This high-strength alloy offers excellent toughness, wear resistance, and fatigue strength. It is ideal for critical components such as landing gear, rotor blades, and structural parts of aircraft and missiles. AMS6381 is also known for its excellent machinability, allowing it to be easily formed, shaped, and welded during manufacturing. Overall, this unique steel grade is designed to withstand extreme conditions and ensure the safety and performance of advanced aerospace technologies.
What Form is AMS 6381 Available at Piping Mart?
- Alloy Steel AISI 4140 Bars
AMS 6381 Composition
AMS 6381 is a low alloy steel with various elements, including carbon, chromium, molybdenum, and vanadium. The carbon content of AMS 6381 sheet is typically around 0.4%, which makes it a medium-carbon alloy steel. The high chromium and molybdenum content give AMS 6381 plate excellent wear resistance, while the vanadium content provides added strength and toughness.
| Element | Content (%) |
|---|---|
| Iron, Fe | 96.785 – 97.77 |
| 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 |
AMS 6381 Physical Properties
AMS 6381 has a density of 7.83 g/cm3 and a melting point of 1515°C. It has a high tensile strength of approximately 1900 MPa, making it an extremely strong steel. Additionally, it has a high thermal conductivity and a low thermal expansion coefficient, making it resistant to heat and temperature changes.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm3 | 0.284 lb/in³ |
| Melting point | 1416°C | 2580°F |
AMS 6381 Mechanical Properties
AMS 6381 strip has excellent mechanical properties, including high hardness, toughness, and wear resistance. Its Rockwell hardness is typically 58-62 HRC, making it a very hard steel ideal for applications that require resistance to wear and tear. Additionally, it has a high yield strength of around 1700 MPa and a high ultimate tensile strength of approximately 1900 MPa.
| 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 |
AMS 6381 Equivalents
| AMS 6349 | ASTM A193 (B7, B7M) | ASTM A506 (4140) | ASTM A752 (4140) |
| AMS 6381 | ASTM A194 (7, 7M) | ASTM A513 | ASTM A829 |
| AMS 6382 | ASTM A29 (4140) | ASTM A513 (4140) | SAE J1397 (4140) |
| AMS 6390 | ASTM A320 (L7, L7M, L7D) | ASTM A519 (4140) | SAE J404 (4140) |
| AMS 6395 | ASTM A322 (4140) | ASTM A646 (4140) | SAE J412 (4140) |
| AMS 6529 | ASTM A331 (4140) | ASTM A711 |
AMS 6381 Uses
AMS 6381 is commonly used in manufacturing applications that require high strength, toughness, and wear resistance. It is often used to make cutting tools, such as saw blades, drill bits, and milling cutters. Additionally, it is frequently used to make components for the automotive, aerospace, and defence industries. AMS 6381 also manufactures moulds, dies, and other precision parts.
AMS 6381 Hardness
AMS 6381 is a very hard steel with a Rockwell hardness of 58-62 HRC. This high hardness makes it ideal for manufacturing cutting tools and other applications that require resistance to wear and tear. Additionally, the high hardness of AMS 6381 makes it difficult to machine or grind, which can be a disadvantage in some manufacturing processes.
AMS 6381 Heat Treatment
AMS 6381 is typically heat-treated to achieve the desired mechanical properties. The heat treatment process involves heating the steel to a specific temperature, holding it at that temperature for some time, and then cooling it at a specific rate. The exact heat treatment process will depend on the specific application and the desired properties of the finished product.
Conclusion:
AMS 6381 is a medium carbon alloy steel known for its strength, toughness, and wear resistance. Its high chromium and molybdenum content give it excellent wear resistance, while its vanadium content provides added strength and toughness. AMS 6381 is commonly used to manufacture cutting tools, automotive components, aerospace and defence industry components, moulds, dies, and other precision parts. If you are in the manufacturing industry and are looking for steel that can withstand wear and tear, AMS 6381 is worth considering.
Meet Bhavesh, a seasoned blogger with a wealth of knowledge and experience. From metal products manufacturing to retail, Bhavesh has a diverse background in various industries and is dedicated to sharing his insights and expertise with readers.
