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Grade 350 Maraging Steel vs. ASTM Grade HI Steel

Both grade 350 maraging steel and ASTM grade HI steel are iron alloys. They have 70% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is grade 350 maraging steel and the bottom bar is ASTM grade HI steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 4.1 to 18
11
Poisson's Ratio 0.3
0.27
Shear Modulus, GPa 75
79
Tensile Strength: Ultimate (UTS), MPa 1140 to 2420
550
Tensile Strength: Yield (Proof), MPa 830 to 2300
270

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Melting Completion (Liquidus), °C 1470
1400
Melting Onset (Solidus), °C 1420
1350
Specific Heat Capacity, J/kg-K 450
490
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Base Metal Price, % relative 39
23
Density, g/cm3 8.2
7.8
Embodied Carbon, kg CO2/kg material 5.6
4.1
Embodied Energy, MJ/kg 74
59
Embodied Water, L/kg 160
200

Common Calculations

PREN (Pitting Resistance) 16
29
Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 190
52
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 38 to 82
20
Strength to Weight: Bending, points 29 to 49
19
Thermal Shock Resistance, points 35 to 74
12

Alloy Composition

Aluminum (Al), % 0.050 to 0.15
0
Boron (B), % 0 to 0.0030
0
Calcium (Ca), % 0 to 0.050
0
Carbon (C), % 0 to 0.030
0.2 to 0.5
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 11.5 to 12.5
0
Iron (Fe), % 61.2 to 64.6
46.9 to 59.8
Manganese (Mn), % 0 to 0.1
0 to 2.0
Molybdenum (Mo), % 4.6 to 5.2
0 to 0.5
Nickel (Ni), % 18 to 19
14 to 18
Phosphorus (P), % 0 to 0.010
0 to 0.040
Silicon (Si), % 0 to 0.1
0 to 2.0
Sulfur (S), % 0 to 0.010
0 to 0.040
Titanium (Ti), % 1.3 to 1.6
0
Zirconium (Zr), % 0 to 0.020
0