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 350
The maraging 350 alloy is a heat treatable austenitic martensitic alloy (depending on heat treatment) that brings together the strength of heat treatable martensitic grades with the corrosion resistance of some of the chromium nickel austenitic grades.
Maraging Alloy 350 Industry Standard
Maraging alloy 350 complies with the MIL S-46850 industry standard.
Applications of Maraging Alloy 350
The maraging alloy 350 is use in a wide range of applications including: industrial cutters valve and gas turbine components
Heat Treatment of Maraging Alloy 350
Typically, the alloy 350 precipitation hardening alloy is furnished in the annealed condition (Condition H). In this condition, the material possesses an austenitic structure, although it has several percent delta ferrite. As an austenitic material, alloy 350 precipitation hardening alloy possesses a relatively low strength. This low strength maximizes formability. Heat treatment is used to obtain the high precipitation hardened strength of the alloy. Heat treatments are done to accomplish two necessary steps. The first is a heat treatment, which allows the relatively stable austenite of Condition H to transform to martensite (Austenite Conditioning and Transformation). The second is a precipitation hardening heat treatment to further strengthen the material. The austenite is easier to transform to martensite using a lower temperature heat treatment. For this reason, Condition DA uses a 1400℉ (760°C) heat treatment to produce a martensite transformation around room temperature, and this is followed by a precipitation hardening heat treatment at 1050℉ (565°C). If Condition SCT 850 is desired, the austenite conditioning heat treatment is conducted at about 1700℉ (925°C). In this case, the martensite transformation is not complete until the material is held for minimum of 3 hours at -100℉ (-73°C). When the transformation is complete, the material is precipitation hardened at 850℉ (455°C) for a minimum of 3 hours.
Chemical Composition of Maraging Alloy 350
The Super Alloys heat treatable maraging alloy 350 has the following chemical composition that gives it its unique properties.
Table 1. Chemical composition of maraging alloy 350
| Chemical Elements | Min | Max |
| Nickel | 4 | 5 |
| Molybdenum | 2.5 | 3.25 |
| Carbon | 0.07 | 0.11 |
| Phosphorus | - | 0.04 |
| Sulfur | - | 0.03 |
| Silicon | - | 0.5 |
| Manganese | - | 0.8 |
| Iron | 75 | |
| Chromium | 16 | 17 |
| Nitrogen | 0.07 | 0.13 |
Mechanical Properties of Maraging Alloy 350
The mechanical properties of maraging alloy 350 following different heat treatments are outlined in the following tables.
Table 2. Mechanical properties of maraging alloy 350 under condition H
| 1500℉ (816°C), 1 hr, AC | Metric | English |
| Tensile Strength, Ultimate | 1035 MPa | 150 ksi |
| Tensile Strength, Yield | 480 MPa | 70 ksi |
| Percent Elongation | 30.00% | |
| Hardness | 20 HRc | 20 HRc |
Table 3. Mechanical properties of maraging alloy 350 under condition SCT 850
| 900℉ (482°C), 4-6hrs, AC | Metric | English |
| Tensile Strength, Ultimate | 1380 MPa | 200 ksi |
| Tensile Strength, Yield | 1520 MPa | 220 ksi |
| Percent Elongation | 9.00% | |
| Hardness | 46 HRc | 46 HRc |
Table 4. Mechanical properties of maraging alloy 350 under condition DA
| 900℉ (482°C), 4-6hrs, AC | Metric | English |
| Tensile Strength, Ultimate | 1100 MPa | 160 ksi |
| Tensile Strength, Yield | 1930 MPa | 280 ksi |
| Percent Elongation | 10.00% | |
| Hardness | 42 HRc | 42 HRc |
Physical Properties of Maraging Alloy 350
The physical properties of maraging alloy 350 are outlined in the following table.
Table 5. Physical properties of maraging alloy 350 under condition H
| Metric | English | |
| Thermal Expansion 21°C (70℉) | 15.2 µm/m-°C | 8.4 µin/in-℉ |
| Thermal Conductivity | 15.9 W/m-K | 9.2 BTU-in/hr-ft2-℉ |
Available Product Forms of Alloy 350
Maraging alloy 350 is available in the forms of plate, bar, sheet, tube, billet, and forging
