AMS 5528 is a popular alloy known for its excellent thermal and mechanical properties, making it perfect for high-temperature applications. The alloy is a nickel-based superalloy that contains chromium, cobalt, and molybdenum. In this blog post, we will look closer at the composition and properties of AMS5528 and its various uses in different industries.
What is AMS 5528?
AMS 5528 (also known as 17-7 PH Stainless Steel) is an austenitic stainless steel alloy commonly used in the aerospace and medical industries. It offers excellent corrosion resistance, formability, weldability, a high strength-to-weight ratio and superior elevated temperature properties.
AMS 5528 Composition
AMS5528 stainless steel is an alloy that contains 50% nickel, 20% chromium, 10% cobalt, and 5% molybdenum. The nickel content in AMS5528 imparts excellent resistance to corrosion and high-temperature oxidation, while chromium and molybdenum enhance the alloy’s overall strength and hardness. Cobalt, on the other hand, improves its wear and tear resistance.
| Element | Content (%) |
|---|---|
| Chromium, Cr | 16-18 |
| Nickel, Ni | 6.50 – 7.75 |
| Manganese, Mn | 1 max |
| Silicon, Si | 1 max |
| Aluminum, Al | 0.75 – 1.50 |
| Carbon, C | 0.09 max |
| Phosphorous, P | 0.040 max |
| Sulfur, S | 0.030 max |
| Iron, Fe | Balance |
AMS 5528 Physical Properties
The alloy has a density of 8.22 g/cm³ and a melting point of 1395°C. Its thermal expansion coefficient is 13.2 µm/m°C, with a thermal conductivity of 12.2 W/mK at 100°C. The alloy has excellent creep resistance and retains good strength even at high temperatures, making it ideal for use in furnace parts and jet engine turbines.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.80 g/cm3 | 0.282 lb/in3 |
AMS 5528 Mechanical Properties
The mechanical properties of 5528AMS depend on the heat treatment condition. In its annealed state, the alloy has a tensile strength of 120 ksi and a yield strength of 60 ksi. Its elongation at break is 35%. After heat treatment, the alloy can exhibit a tensile strength of up to 185 ksi, yield strength of up to 130 ksi, and elongation at a break of up to 10%.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 1170 MPa | 170000 psi |
| Yield strength | 965 MPa | 140000 psi |
| Modulus of elasticity | 204 GPa | 29600 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break | 6% | 6% |
| Hardness, Rockwell C | 38 | 38 |
AMS 5528 Equivalent
| AISI 631 | AMS 5528 | AMS 5529 | AMS 5568 | AMS 5644 |
| AMS 5678 | ASTM A313 (631) | ASTM A564 (631) | ASTM A579 (631) | ASTM A693 (631) |
| ASTM A705 (631) | DIN 1.4568 | MIL S-25043 | DIN 1.4568 | AMS 5673 |
| AMS 5824 | ASME SA705 | ASTM A579 (grade 62) | MIL SPEC MIL-W-46078 | SAE J217 |
| SAE J467 |
AMS 5528 Hardness
AMS 5528 strips has a hardness range of 100-280 HB, depending on the heat treatment condition. It has excellent toughness, making it resistant to cracking and deformation. The alloy can resist corrosion from hot gases and liquids, making it an ideal material for applications in chemical and petrochemical industries.
AMS 5528 Uses
AMS 5528 plates is widely used in the aerospace and defence industries, requiring high strength and corrosion resistance. The alloy is ideal for making jet engine components such as turbine blades, combustor cans, and afterburner parts. It is also used in the oil and gas industry for parts such as heat exchangers, valves, and tubing, where harsh environmental conditions are common.
AMS 5528 Heat treatment
AMS 5528 can be heat-treated using solution treatment, ageing, and stress-relieving methods. These treatments can significantly improve the alloy’s mechanical properties, including tensile strength, yield strength, and elongation at break. Depending on the application and desired properties, the heat treatment process can be customized to meet specific requirements.
AMS 5528 Density
AMS 5528 is a high-performance material that offers excellent strength, toughness, and corrosion resistance. Its density, the mass per unit volume of the material, plays a crucial role in several applications. The density of AMS 5528 is 0.284 lb/in³, making it a lightweight yet durable material that is perfect for the aerospace and automotive industries. It can withstand extreme temperatures and harsh environments without compromising its mechanical properties. Overall, the density of AMS 5528 and its other properties make it an ideal choice for several challenging applications.
Conclusion:
AMS 5528 is a versatile alloy with excellent thermal and mechanical properties, making it ideal for high-temperature applications. Its excellent corrosion resistance and toughness make it a popular choice in the aerospace, defence, and oil and gas industries. With proper heat treatment, this alloy can exhibit higher tensile strength, yield strength, and elongation at break, making it an outstanding engineering material for different applications.
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