Grade 250 Maraging Steel
Grade 250 maraging steel is a maraging steel. The British Standard (BS) designation for this material is S162. The UNS number is K92890. It has a very low heat capacity among iron alloys. In addition, it has a very high density and a very high base cost.
The properties of grade 250 maraging steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare grade 250 maraging steel to: maraging steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Compressive (Crushing) Strength
730 to 1660 MPa 110 to 240 x 103 psi
Elastic (Young's, Tensile) Modulus
190 GPa 28 x 106 psi
Elongation at Break
7.3 to 17 %
Poisson's Ratio
0.3
Rockwell C Hardness
30 to 53
Shear Modulus
75 GPa 11 x 106 psi
Shear Strength
600 to 1060 MPa 87 to 150 x 103 psi
Tensile Strength: Ultimate (UTS)
970 to 1800 MPa 140 to 260 x 103 psi
Tensile Strength: Yield (Proof)
660 to 1740 MPa 96 to 250 x 103 psi
Thermal Properties
Latent Heat of Fusion
270 J/g
Melting Completion (Liquidus)
1480 °C 2690 °F
Melting Onset (Solidus)
1430 °C 2610 °F
Specific Heat Capacity
450 J/kg-K 0.11 BTU/lb-°F
Thermal Expansion
12 µm/m-K
Otherwise Unclassified Properties
Base Metal Price
32 % relative
Density
8.2 g/cm3 510 lb/ft3
Embodied Carbon
4.9 kg CO2/kg material
Embodied Energy
65 MJ/kg 28 x 103 BTU/lb
Embodied Water
140 L/kg 16 gal/lb
Common Calculations
PREN (Pitting Resistance)
16
Resilience: Ultimate (Unit Rupture Work)
130 to 150 MJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
23 points
Strength to Weight: Axial
33 to 61 points
Strength to Weight: Bending
26 to 40 points
Thermal Shock Resistance
29 to 54 points
Alloy Composition
| Fe | 66.3 to 71.1 | |
| Ni | 17 to 19 | |
| Co | 7.0 to 8.5 | |
| Mo | 4.6 to 5.2 | |
| Ti | 0.3 to 0.5 | |
| Al | 0.050 to 0.15 | |
| Mn | 0 to 0.1 | |
| Si | 0 to 0.1 | |
| Ca | 0 to 0.050 | |
| C | 0 to 0.030 | |
| Zr | 0 to 0.020 | |
| P | 0 to 0.010 | |
| S | 0 to 0.010 | |
| B | 0 to 0.0030 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
MIL-S-46850D: Steel: Bar, Plate, Sheet, Strip, Forgings, and Extrusions, 18 Percent Nickel Alloy, Maraging, 200 KSI, 250 KSI, 300 KSI, and 350 KSI, High Quality
Maraging Steels: Modelling of Microstructure, Properties and Applications, Wei Sha and Zhanli Guo, 2009
Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015