Grade 300 Maraging Steel
Grade 300 maraging steel is a maraging steel. It has a very low heat capacity among iron alloys. In addition, it has a very high base cost and a very high density.
The properties of grade 300 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 300 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 1880 MPa 110 to 270 x 103 psi
Elastic (Young's, Tensile) Modulus
190 GPa 28 x 106 psi
Elongation at Break
6.5 to 18 %
Poisson's Ratio
0.3
Rockwell C Hardness
31 to 56
Shear Modulus
75 GPa 11 x 106 psi
Shear Strength
640 to 1190 MPa 92 to 170 x 103 psi
Tensile Strength: Ultimate (UTS)
1030 to 2030 MPa 150 to 290 x 103 psi
Tensile Strength: Yield (Proof)
760 to 1990 MPa 110 to 290 x 103 psi
Thermal Properties
Latent Heat of Fusion
270 J/g
Melting Completion (Liquidus)
1480 °C 2690 °F
Melting Onset (Solidus)
1430 °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
34 % relative
Density
8.2 g/cm3 510 lb/ft3
Embodied Carbon
5.1 kg CO2/kg material
Embodied Energy
68 MJ/kg 29 x 103 BTU/lb
Embodied Water
150 L/kg 17 gal/lb
Common Calculations
PREN (Pitting Resistance)
16
Resilience: Ultimate (Unit Rupture Work)
130 to 170 MJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
23 points
Strength to Weight: Axial
35 to 68 points
Strength to Weight: Bending
28 to 43 points
Thermal Shock Resistance
31 to 62 points
Alloy Composition
| Fe | 65 to 68.4 | |
| Ni | 18 to 19 | |
| Co | 8.5 to 9.5 | |
| Mo | 4.6 to 5.2 | |
| Ti | 0.5 to 0.8 | |
| 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