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Nickel 685 vs. ASTM Grade HD Steel

Nickel 685 belongs to the nickel alloys classification, while ASTM grade HD steel belongs to the iron alloys. They have a modest 27% of their average alloy composition in common, which, by itself, doesn't mean much. 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 685 and the bottom bar is ASTM grade HD steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
9.1
Fatigue Strength, MPa 470
140
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 77
80
Tensile Strength: Ultimate (UTS), MPa 1250
590
Tensile Strength: Yield (Proof), MPa 850
270

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Maximum Temperature: Mechanical, °C 1000
1100
Melting Completion (Liquidus), °C 1380
1410
Melting Onset (Solidus), °C 1330
1370
Specific Heat Capacity, J/kg-K 460
490
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 75
17
Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 10
3.1
Embodied Energy, MJ/kg 140
45
Embodied Water, L/kg 340
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
44
Resilience: Unit (Modulus of Resilience), kJ/m3 1820
180
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 23
26
Strength to Weight: Axial, points 42
21
Strength to Weight: Bending, points 31
20
Thermal Diffusivity, mm2/s 3.3
4.3
Thermal Shock Resistance, points 37
19

Alloy Composition

Aluminum (Al), % 1.2 to 1.6
0
Boron (B), % 0.0030 to 0.010
0
Carbon (C), % 0.030 to 0.1
0 to 0.5
Chromium (Cr), % 18 to 21
26 to 30
Cobalt (Co), % 12 to 15
0
Copper (Cu), % 0 to 0.5
0
Iron (Fe), % 0 to 2.0
58.4 to 70
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 3.5 to 5.0
0 to 0.5
Nickel (Ni), % 49.6 to 62.5
4.0 to 7.0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.75
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040
Titanium (Ti), % 2.8 to 3.3
0
Zinc (Zn), % 0.020 to 0.12
0