1. Introduce
– Low carbon precipitation strengthened Ni alloy, mainly composed of Fe, Ni, Co, and Mo
– Has the best mechanical properties of all maraging steels
– Maintains strength up to 450℃, good notch impact at -50℃ and below
– 18Ni, Maraging C350, Vascomax C350
– UNS K93160
* Maraging
- Precipitation hardening treatment with extremely low carbon concentration martensite followed by aging treatment to improve mechanical properties
- Martensite + Aging = Maraging steel
- Large amount of Ni added to facilitate martensite transformation
- Steel with Co and Mo added to Ni alloy to strengthen precipitation of intermetallic compounds
- In maraging steel, C has a great influence on strength, and even a very small amount of C content can greatly improve the strength of martensite
- Generally, there are Maraging 200, 250, 300, 350, and the higher the grade, the more Co and Ti are added
* 350 : Means minimum tensile strength (ksi) of Maraging 350 (350ksi*6.9 = 2415MPa)
* 18Ni : It means Ni contains 18%
* UNS
- Abbreviation of Unified Numbering Systems for Metals and Alloys
- Unified numbering system for metals and alloys
- A representative number that is compatible with metals and alloys defined in many material-related codes such as ASTM, AISI, ASME, AWS, etc.
* K : Miscellaneous steels and ferrous alloys
2. Property
– Excellent strength, tensile and yield strength, weldability, and crack resistance
| Element | Impact |
|---|---|
| Ni | Provides excellent strength and corrosion resistance |
| Co | Precipitation strengthening element, provides strength and creep properties |
| Mo | Precipitation strengthening element, provides strength, high temperature creep properties |
[Maraging 350 Chemical Composition (%)]
| Ni | Fe | C | Al |
|---|---|---|---|
| 17.00 ~ 19.00 | 65.80 ~ 70.35 | Max. 0.03 | 0.05 ~ 0.15 |
| Ti | Si | Mn | Mo |
|---|---|---|---|
| 0.60 ~ 0.80 | Max. 0.10 | Max. 0.10 | 4.00 ~ 5.00 |
| S | Co | P | |
|---|---|---|---|
| Max. 0.01 | 8.00 ~ 9.00 | Max. 0.01 |
[Maraging 350 Mechanical Properties]
| Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) |
|---|---|---|
| 2451 | 2395 | 3 |
[Maraging 350 Physical Properties]
| Density (g/㎤) | Melting Range (℃) | Specific Heat (0-100℃), J/kg*℃ |
|---|---|---|
| 8.08 | 1425 ~ 1505 | 440 |
3. Standard & Specification
– UNS K93160
| AMS | 6512, 6514, 6515 |
| MIL | S46850 |
4. Available Form
– Bar, Rod
– Plate, Sheet, Strip
– Pipe, Tube : Seamless, Welded
– Wire : Welded. Springs
5. Application & Product
– Aerospace
| Application | Product |
|---|---|
| Aerospace | Missiles, Rocket motor cases, Aircraft landing gear, Pressure vessels, Fasteners, Shafts |
(1) Aircraft landing gear / (2) Pressure vessles / (3) Shafts
(4) Missiles
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