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ASTM Grade HK Steel vs. Grade 250 Maraging Steel

Both ASTM grade HK steel and grade 250 maraging 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 ASTM grade HK steel and the bottom bar is grade 250 maraging steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 11
7.3 to 17
Poisson's Ratio 0.27
0.3
Shear Modulus, GPa 79
75
Tensile Strength: Ultimate (UTS), MPa 500
970 to 1800
Tensile Strength: Yield (Proof), MPa 270
660 to 1740

Thermal Properties

Latent Heat of Fusion, J/g 310
270
Melting Completion (Liquidus), °C 1400
1480
Melting Onset (Solidus), °C 1350
1430
Specific Heat Capacity, J/kg-K 480
450
Thermal Expansion, µm/m-K 17
12

Otherwise Unclassified Properties

Base Metal Price, % relative 25
32
Density, g/cm3 7.8
8.2
Embodied Carbon, kg CO2/kg material 4.4
4.9
Embodied Energy, MJ/kg 63
65
Embodied Water, L/kg 200
140

Common Calculations

PREN (Pitting Resistance) 27
16
Resilience: Ultimate (Unit Rupture Work), MJ/m3 48
130 to 150
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 18
33 to 61
Strength to Weight: Bending, points 18
26 to 40
Thermal Shock Resistance, points 11
29 to 54

Alloy Composition

Aluminum (Al), % 0
0.050 to 0.15
Boron (B), % 0
0 to 0.0030
Calcium (Ca), % 0
0 to 0.050
Carbon (C), % 0.2 to 0.6
0 to 0.030
Chromium (Cr), % 24 to 28
0
Cobalt (Co), % 0
7.0 to 8.5
Iron (Fe), % 44.8 to 57.8
66.3 to 71.1
Manganese (Mn), % 0 to 2.0
0 to 0.1
Molybdenum (Mo), % 0 to 0.5
4.6 to 5.2
Nickel (Ni), % 18 to 22
17 to 19
Phosphorus (P), % 0 to 0.040
0 to 0.010
Silicon (Si), % 0 to 2.0
0 to 0.1
Sulfur (S), % 0 to 0.040
0 to 0.010
Titanium (Ti), % 0
0.3 to 0.5
Zirconium (Zr), % 0
0 to 0.020