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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

Iron (Fe) 66.3 to 71.1
Nickel (Ni) 17 to 19
Cobalt (Co) 7.0 to 8.5
Molybdenum (Mo) 4.6 to 5.2
Titanium (Ti) 0.3 to 0.5
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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015