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ASTM Grade HN Steel vs. AWS ERNiMo-3

ASTM grade HN steel belongs to the iron alloys classification, while AWS ERNiMo-3 belongs to the nickel alloys. They have a modest 37% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is ASTM grade HN steel and the bottom bar is AWS ERNiMo-3.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 77
83
Tensile Strength: Ultimate (UTS), MPa 500
770

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1400
1600
Melting Onset (Solidus), °C 1350
1540
Specific Heat Capacity, J/kg-K 480
400
Thermal Expansion, µm/m-K 16
11

Otherwise Unclassified Properties

Base Metal Price, % relative 26
70
Density, g/cm3 7.9
9.1
Embodied Carbon, kg CO2/kg material 4.6
15
Embodied Energy, MJ/kg 66
190
Embodied Water, L/kg 180
270

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 17
24
Strength to Weight: Bending, points 18
21
Thermal Shock Resistance, points 11
24

Alloy Composition

Carbon (C), % 0.2 to 0.5
0 to 0.12
Chromium (Cr), % 19 to 23
4.0 to 6.0
Cobalt (Co), % 0
0 to 2.5
Copper (Cu), % 0
0 to 0.5
Iron (Fe), % 44.9 to 57.8
4.0 to 7.0
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
23 to 26
Nickel (Ni), % 23 to 27
53.7 to 69
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030
Tungsten (W), % 0
0 to 1.0
Vanadium (V), % 0
0 to 0.6
Residuals, % 0
0 to 0.5