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Nickel 725 vs. ASTM Grade HI Steel

Nickel 725 belongs to the nickel alloys classification, while ASTM grade HI steel belongs to the iron 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 nickel 725 and the bottom bar is ASTM grade HI steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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