Topics Covered
Background
Maraging Alloy 300
Maraging Alloy 300 Industry Standard
Applications of Maraging Alloy 300
Heat Treatment of Maraging Alloy 250
Chemical Composition of Maraging Alloy 250
Mechanical Properties of Maraging Alloy 300
Physical Properties of Maraging Alloy 300
Available Product Forms of Alloy 300
Background
The Super Alloys management team are amongst the most experienced professionals in the market. Supported by professional metallurgists and technicians, Super Alloys not only provide access to the largest range of high-tec metals in Europe, but also access to the broadest range of expertise.
The unique combination of access to stock, expertise and rapid delivery reduces lead times and can eliminate costly production delays.
The Super Alloys range of materials includes:
Titanium Alloys
Nickel Alloys
Steels
Maraging Alloy 300
Maraging alloy 300 is a very high strength iron base, nickel, molybdenum, cobalt alloy. It may be age hardened to a strength level of 2068 MPa (300 ksi) ultimate with a hardness on the order of Rockwell C 53.
Maraging Alloy 300 Industry Standard
Maraging alloy 300 complies with the AMS 6514 industry standard and is also known as UNS K44220.
Applications of Maraging Alloy 300
The maraging alloy 300 is use in aircraft landing gear
Heat Treatment of Maraging Alloy 250
Hardening is accomplished by a simple aging cycle of 4 to 6 hours at 482°C (900℉) followed by air cooling. Alloy 300 provides through hardening without quenching, freedom from decarburization, minimal distortion during aging, good formability, machinability, and weldability and a low coefficient of thermal expansion.
Chemical Composition of Maraging Alloy 250
The Super Alloys ultra-high strength maraging alloy 300 has the following chemical composition that gives it its unique properties.
Table 1. Chemical composition of maraging alloy 300
| Chemical Elements | Min | Max |
| Nickel | 18 | 19 |
| Molybdenum | 4.7 | 5.1 |
| Carbon | - | 0.03 |
| Phosphorus | - | 0.01 |
| Sulfur | - | 0.01 |
| Silicon | - | 0.1 |
| Manganese | - | 0.1 |
| Iron | 66.7 | - |
| Calcium | - | 0.05 |
| Zirconium | - | 0.03 |
| Boron | - | 0 |
| Cobalt | 8 | 9.5 |
| Titanium | 0.5 | 0.8 |
| Aluminum | 0.05 | 0.15 |
Mechanical Properties of Maraging Alloy 300
The mechanical properties of maraging alloy 300 following different heat treatments are outlined in the following tables.
Table 2. Mechanical properties for solution annealed maraging alloy 300
| 1500℉ (816°C), 1 hr, AC | Metric | English |
| Tensile Strength, Ultimate | 1034 MPa | 150 ksi |
| Tensile Strength, Yield | 827 MPa | 120 ksi |
| Percent Elongation | 16.00% | |
| Hardness | 30 HRc | 30 HRc |
Table 3. Mechanical properties for solution annealed and aged maraging alloy 250
| 900℉ (482°C), 4-6hrs, AC | Metric | English |
| Tensile Strength, Ultimate | 1930 MPa | 280 ksi |
| Tensile Strength, Yield | 1862 MPa | 270 ksi |
| Percent Elongation | 5.00% | |
| Hardness | 52 HRc | 52 HRc |
Physical Properties of Maraging Alloy 300
The physical properties of maraging alloy 300 are outlined in the following table.
Table 4. Physical properties of maraging alloy 300
| Metric | Imperical | |
| Thermal Expansion 21°C (70℉) | 8.64µm/m-°C | 4.8 µin/in-℉ |
| Specific Heat Capacity | 335 J/kg-°K | 0.08 BTU/lb-℉ |
| Thermal Conductivity | 19.6 W/m-°C | 136 BTU-in/hr-ft2-℉ |
| Melting Point | 1405 - 1440°C | 2560 -2620℉ |
Available Product Forms of Alloy 300
Maraging alloy 300 is available in the forms of plate, bar, sheet, tube, billet, and forging