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Grade 250 Maraging Steel vs. ASTM Grade HH Steel

Both grade 250 maraging steel and ASTM grade HH steel are iron alloys. They have 72% 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 250 maraging steel and the bottom bar is ASTM grade HH steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 7.3 to 17
11
Poisson's Ratio 0.3
0.27
Shear Modulus, GPa 75
79
Tensile Strength: Ultimate (UTS), MPa 970 to 1800
580
Tensile Strength: Yield (Proof), MPa 660 to 1740
270

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Melting Completion (Liquidus), °C 1480
1400
Melting Onset (Solidus), °C 1430
1360
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Base Metal Price, % relative 32
20
Density, g/cm3 8.2
7.7
Embodied Carbon, kg CO2/kg material 4.9
3.7
Embodied Energy, MJ/kg 65
53
Embodied Water, L/kg 140
180

Common Calculations

PREN (Pitting Resistance) 16
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130 to 150
53
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 33 to 61
21
Strength to Weight: Bending, points 26 to 40
20
Thermal Shock Resistance, points 29 to 54
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
24 to 28
Cobalt (Co), % 7.0 to 8.5
0
Iron (Fe), % 66.3 to 71.1
52.9 to 64.8
Manganese (Mn), % 0 to 0.1
0 to 2.0
Molybdenum (Mo), % 4.6 to 5.2
0 to 0.5
Nickel (Ni), % 17 to 19
11 to 14
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), % 0.3 to 0.5
0
Zirconium (Zr), % 0 to 0.020
0