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ASTM A387 Grade 21 Steel vs. Nickel 825

ASTM A387 grade 21 steel belongs to the iron alloys classification, while nickel 825 belongs to the nickel alloys. They have a modest 35% of their average alloy composition in common, which, by itself, doesn't mean much. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 21 steel and the bottom bar is nickel 825.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
34
Fatigue Strength, MPa 160 to 250
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
78
Shear Strength, MPa 310 to 370
430
Tensile Strength: Ultimate (UTS), MPa 500 to 590
650
Tensile Strength: Yield (Proof), MPa 230 to 350
260

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Maximum Temperature: Mechanical, °C 480
980
Melting Completion (Liquidus), °C 1470
1400
Melting Onset (Solidus), °C 1430
1370
Specific Heat Capacity, J/kg-K 470
460
Thermal Conductivity, W/m-K 41
11
Thermal Expansion, µm/m-K 13
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
1.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
1.7

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
41
Density, g/cm3 7.9
8.2
Embodied Carbon, kg CO2/kg material 1.8
7.2
Embodied Energy, MJ/kg 23
100
Embodied Water, L/kg 62
230

Common Calculations

PREN (Pitting Resistance) 6.4
31
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
180
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
170
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18 to 21
22
Strength to Weight: Bending, points 18 to 20
20
Thermal Diffusivity, mm2/s 11
2.9
Thermal Shock Resistance, points 14 to 17
17

Alloy Composition

Aluminum (Al), % 0
0 to 0.2
Carbon (C), % 0.050 to 0.15
0 to 0.050
Chromium (Cr), % 2.8 to 3.3
19.5 to 23.5
Copper (Cu), % 0
1.5 to 3.0
Iron (Fe), % 94.4 to 96
22 to 37.9
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
2.5 to 3.5
Nickel (Ni), % 0
38 to 46
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.5
0 to 0.050
Sulfur (S), % 0 to 0.025
0 to 0.030
Titanium (Ti), % 0
0.6 to 1.2