Grade 350 Maraging Steel
Grade 350 maraging steel is a maraging steel. It can have a fairly high tensile strength among iron alloys. In addition, it has a very high base cost and a very low heat capacity.
The properties of grade 350 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 350 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
750 to 2400 MPa 110 to 350 x 103 psi
Elastic (Young's, Tensile) Modulus
190 GPa 28 x 106 psi
Elongation at Break
4.1 to 18 %
Poisson's Ratio
0.3
Rockwell C Hardness
34 to 60
Shear Modulus
75 GPa 11 x 106 psi
Shear Strength
710 to 1400 MPa 100 to 200 x 103 psi
Tensile Strength: Ultimate (UTS)
1140 to 2420 MPa 170 to 350 x 103 psi
Tensile Strength: Yield (Proof)
830 to 2300 MPa 120 to 330 x 103 psi
Thermal Properties
Latent Heat of Fusion
270 J/g
Melting Completion (Liquidus)
1470 °C 2680 °F
Melting Onset (Solidus)
1420 °C 2600 °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
39 % relative
Density
8.2 g/cm3 510 lb/ft3
Embodied Carbon
5.6 kg CO2/kg material
Embodied Energy
74 MJ/kg 32 x 103 BTU/lb
Embodied Water
160 L/kg 19 gal/lb
Common Calculations
PREN (Pitting Resistance)
16
Resilience: Ultimate (Unit Rupture Work)
98 to 190 MJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
23 points
Strength to Weight: Axial
38 to 82 points
Strength to Weight: Bending
29 to 49 points
Thermal Shock Resistance
35 to 74 points
Alloy Composition
| Fe | 61.2 to 64.6 | |
| Ni | 18 to 19 | |
| Co | 11.5 to 12.5 | |
| Mo | 4.6 to 5.2 | |
| Ti | 1.3 to 1.6 | |
| 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