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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

Iron (Fe) 65 to 68.4
Nickel (Ni) 18 to 19
Cobalt (Co) 8.5 to 9.5
Molybdenum (Mo) 4.6 to 5.2
Titanium (Ti) 0.5 to 0.8
Aluminum (Al) 0.050 to 0.15
Manganese (Mn) 0 to 0.1
Silicon (Si) 0 to 0.1
Calcium (Ca) 0 to 0.050
Carbon (C) 0 to 0.030
Zirconium (Zr) 0 to 0.020
Phosphorus (P) 0 to 0.010
Sulfur (S) 0 to 0.010
Boron (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