AMS 7726 is a famous composition used for various applications in materials engineering. If you’re wondering what AMS 7726 is, its physical and mechanical properties, how it’s used, and its hardness and heat treatment, this article is for you. Below, we’ll give you all the information you need to know about AMS 7726.
What is AMS 7726?
AMS 7726 (also known as Nilo K Alloy) is a material specification for an aluminium alloy commonly used in aerospace applications. The alloy is notable for its exceptional strength-to-weight ratio, making it ideal for use in aircraft components such as fuselage frames, wing supports, and engine parts. Developed by the Aerospace Materials Division of the Society of Automotive Engineers, AMS 7726 sets rigorous standards for this type of alloy’s chemical composition, mechanical properties, and tolerances. By adhering to these specifications, manufacturers can ensure that their materials meet the high-performance requirements demanded by the aerospace industry.
AMS 7726 Composition
AMS 7726 is a low alloy steel which contains controlled amounts of molybdenum, chromium, nickel, and vanadium. These elements give it high strength, toughness, and resistance to wear. Its chemical composition falls within ASTM A-231 and ASTM A-232 standards.
| Element | Content (%) |
|---|---|
| Iron, Fe | 53 |
| Nickel, Ni | 29 |
| Cobalt, Co | 17 |
| Others | Remainder |
AMS 7726 Physical Properties
AMS 7726 has a density of roughly 7.85 g/cm3. It has a melting point of 1460°C and a boiling point of 2730°C. Its electrical conductivity is low, while its thermal conductivity is high. The expansion coefficient is approximately 11.7 × 10^-6 m/mK. Additionally, its coefficient of thermal conductivity is 13.1 W/mK.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.16 gm/cm3 | 0.295 lb/in3 |
AMS 7726 Mechanical Properties
AMS 7726 has a yield strength of 897 MPa and an ultimate tensile strength of 1320 MPa. It has a high elastic modulus of 207 GPa. The steel has good fatigue resistance. Moreover, it is not prone to hydrogen cracking, stress corrosion cracking and embrittlement.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 520MPa | 75.4 ksi |
| Yield strength | 340 MPa | 49.3 ksi |
| Modulus of elasticity | 130 GPa | 18900 ksi |
AMS 7726 Equivalents
- UNS K94610
- ASTM F15
- DIN 17745
- AFNOR NF A54-301.
AMS 7726 Uses
AMS 7726 is used in various applications, including gears, bearings, shafts, and fasteners in parts exposed to high stress and wear conditions. Steel is often used to manufacture high-precision mechanical parts in the aerospace, defence, and oil and gas industries.
AMS 7726 Hardness
In the quenched and tempered condition, AMS 7726 has a hardness range of 345-388 HB. It has good machinability and can be readily machined using conventional methods.
AMS 7726 Heat treatment
AMS 7726 can be heat treated with good response, enabling it to achieve a wide range of mechanical properties. The heat treatment process commonly used includes normalizing, quenching, tempering and annealing. Annealing is done at a temperature range of 800-930°C for two hours, while quenching can be done using oil or water at a temperature range of 820-870°C.
Conclusion:
AMS 7726 is an excellent low alloy steel with high strength, toughness, and wear resistance. By understanding its composition, physical and mechanical properties, uses, hardness and heat treatment, you can better appreciate steel’s versatility and importance in various industries. AMS 7726 is just one of many alloys out there. Still, it’s a crucial material in manufacturing high-precision mechanical parts, and understanding its properties is a valuable asset to any engineer or materials scientist.
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