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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 high embodied energy.

The properties of grade 350 maraging steel include two common variations. The property values on this page show ranges across all 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). The length of each bar shows the given value as a % of the largest value in the relevant set.

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

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

40 % 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

Iron (Fe) 61.2 to 64.6
Nickel (Ni) 18 to 19
Cobalt (Co) 11.5 to 12.5
Molybdenum (Mo) 4.6 to 5.2
Titanium (Ti) 1.3 to 1.6
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