Maraging 250 is an age hardenable iron-nickel steel alloy with ultra high strength and toughness. Maraging 250 is easily machinable in the annealed condition prior to final heat treatment. Maraging 250 has improved fracture toughness from Maraging 300 but slightly less strength. The unique properties makes it suitable for many critical aerospace applications.
VIM+VAR
| Grade | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Mn | Si | P | S | Ni | Mo | Co | Ti | Al | B | Zr | |
| Maraging 250 | 0.03 | 0.10 | 0.10 | 0.01 | 0.01 | 18.50 | 4.80 | 7.50 | 0.40 | 0.10 | 0.0030 | 0.01 |
| X2NiCoMo18-8-5, 1.6359 | Max 0.03 | Max 0.10 | Max 0.10 | Max 0.01 | Max 0.01 | 17-19 | 4.80 | 8-10 | 0.40 | 0.05-0.15 | 0.0030 | 0.01 |
| X1NiCoMo18-8-5 | ||||||||||||
| UNS K92890 | Max 0.03 | Max 0.10 | Max 0.10 | Max 0.01 | Max 0.01 | 17-19 | 4.60-5.10 | 7-8.50 | 0.30-0.50 | 0.05-0.15 | ||
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 965 MPa | 140000 psi |
| Yield strength (@strain 0.200 %) | 655 MPa | 95000 psi |
| Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (estimated from elastic modulus) | 73.0 GPa | 10600 ksi |
| Elastic modulus | 190 GPa | 27600 ksi |
| Poisson's ratio (calculated) | 0.3 | 0.3 |
| Elongation at break (in gage length of 4.5 times the square root of area) | 17.00% | 17.00% |
| Reduction of area | 75.00% | 75.00% |
| Hardness, Brinell (converted from Rockwell C hardness) | 290 | 290 |
| Hardness, Knoop (converted from Rockwell C hardness) | 311 | 311 |
| Hardness, Rockwell C | 30 | 30 |
| Hardness, Vickers (converted from Rockwell hardness) | 301 | 301 |
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.00 g/cc | 0.289 lb/in³ |
Steel grade
Special steel