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ASTM Grade HI Steel vs. Nickel 725

ASTM grade HI steel belongs to the iron alloys classification, while nickel 725 belongs to the nickel alloys. They have 46% of their average alloy composition in common. There are 27 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 HI steel and the bottom bar is nickel 725.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 11
34
Fatigue Strength, MPa 150
260
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 79
78
Tensile Strength: Ultimate (UTS), MPa 550
860
Tensile Strength: Yield (Proof), MPa 270
350

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Maximum Temperature: Mechanical, °C 1100
980
Melting Completion (Liquidus), °C 1400
1340
Melting Onset (Solidus), °C 1350
1270
Specific Heat Capacity, J/kg-K 490
440
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
1.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
1.6

Otherwise Unclassified Properties

Base Metal Price, % relative 23
75
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 4.1
13
Embodied Energy, MJ/kg 59
190
Embodied Water, L/kg 200
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 52
240
Resilience: Unit (Modulus of Resilience), kJ/m3 180
300
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 20
28
Strength to Weight: Bending, points 19
24
Thermal Shock Resistance, points 12
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.35
Carbon (C), % 0.2 to 0.5
0 to 0.030
Chromium (Cr), % 26 to 30
19 to 22.5
Iron (Fe), % 46.9 to 59.8
2.3 to 15.3
Manganese (Mn), % 0 to 2.0
0 to 0.35
Molybdenum (Mo), % 0 to 0.5
7.0 to 9.5
Nickel (Ni), % 14 to 18
55 to 59
Niobium (Nb), % 0
2.8 to 4.0
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 2.0
0 to 0.2
Sulfur (S), % 0 to 0.040
0 to 0.010
Titanium (Ti), % 0
1.0 to 1.7