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ASTM Grade HH Steel vs. Nickel 625

ASTM grade HH steel belongs to the iron alloys classification, while nickel 625 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 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is ASTM grade HH steel and the bottom bar is nickel 625.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 11
33 to 34
Fatigue Strength, MPa 150
240 to 320
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 79
79
Tensile Strength: Ultimate (UTS), MPa 580
790 to 910
Tensile Strength: Yield (Proof), MPa 270
320 to 450

Thermal Properties

Latent Heat of Fusion, J/g 310
330
Maximum Temperature: Mechanical, °C 1100
980
Melting Completion (Liquidus), °C 1400
1350
Melting Onset (Solidus), °C 1360
1290
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 14
11
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
1.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
1.4

Otherwise Unclassified Properties

Base Metal Price, % relative 20
80
Density, g/cm3 7.7
8.6
Embodied Carbon, kg CO2/kg material 3.7
14
Embodied Energy, MJ/kg 53
190
Embodied Water, L/kg 180
290

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 53
220 to 250
Resilience: Unit (Modulus of Resilience), kJ/m3 190
260 to 490
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 21
26 to 29
Strength to Weight: Bending, points 20
22 to 24
Thermal Diffusivity, mm2/s 3.8
2.9
Thermal Shock Resistance, points 12
22 to 25

Alloy Composition

Aluminum (Al), % 0
0 to 0.4
Carbon (C), % 0.2 to 0.5
0 to 0.1
Chromium (Cr), % 24 to 28
20 to 23
Cobalt (Co), % 0
0 to 1.0
Iron (Fe), % 52.9 to 64.8
0 to 5.0
Manganese (Mn), % 0 to 2.0
0 to 0.5
Molybdenum (Mo), % 0 to 0.5
8.0 to 10
Nickel (Ni), % 11 to 14
58 to 68.9
Niobium (Nb), % 0
3.2 to 4.2
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.015
Titanium (Ti), % 0
0 to 0.4