MakeItFrom.com
Menu (ESC)

Grade 350 Maraging Steel

Grade 350 maraging steel is a maraging steel. It has a very high base cost among iron alloys. In addition, it has a fairly low heat capacity and can have a fairly high tensile strength. It has two common variants, each represented as a separate material. The material properties section shows ranges encompassing all variants. To see the details of each variant on a separate page, follow the links in the Variant Materials section further below.

Mechanical Properties

Graph bars compare grade 350 maraging steel to other materials. From top to bottom: maraging (18Ni) steel, iron alloys, and the entire database.

Compressive (Crushing) Strength

750 to 2400 MPa 110 to 350 x 103 psi

Elastic (Young's, Tensile) Modulus

210 GPa 30 x 106 psi

Elongation at Break

4.1 to 18 %

Modulus of Resilience (Unit Resilience)

1650 to 14610 kJ/m3

Poisson's Ratio

0.3

Rockwell C Hardness

33 to 61

Strength to Weight Ratio

140 to 290 kN-m/kg

Tensile Strength: Ultimate (UTS)

1140 to 2420 MPa 170 to 350 x 103 psi

Tensile Strength: Yield (Proof)

830 to 2470 MPa 120 to 360 x 103 psi

Unit Rupture Work (Ultimate Resilience)

100 to 190 MJ/m3

Other Material Properties

Base Metal Price

66 % 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

PREN (Pitting Resistance)

16

Specific Heat Capacity

440 J/kg-K 0.1 BTU/lb-°F

Thermal Expansion

13 µm/m-K

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

Variant Materials

Similar Alloys

Further Reading

Maraging Steels: Modelling of Microstructure, Properties and Applications, Wei Sha and Zhanli Guo, 2009

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

Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993