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C72700 Copper-nickel vs. AISI 321 Stainless Steel

C72700 copper-nickel belongs to the copper alloys classification, while AISI 321 stainless steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is C72700 copper-nickel and the bottom bar is AISI 321 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
200
Elongation at Break, % 4.0 to 36
34 to 50
Poisson's Ratio 0.34
0.28
Shear Modulus, GPa 44
77
Shear Strength, MPa 310 to 620
420 to 460
Tensile Strength: Ultimate (UTS), MPa 460 to 1070
590 to 690
Tensile Strength: Yield (Proof), MPa 580 to 1060
220 to 350

Thermal Properties

Latent Heat of Fusion, J/g 210
290
Maximum Temperature: Mechanical, °C 200
870
Melting Completion (Liquidus), °C 1100
1430
Melting Onset (Solidus), °C 930
1400
Specific Heat Capacity, J/kg-K 380
480
Thermal Conductivity, W/m-K 54
16
Thermal Expansion, µm/m-K 17
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 11
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 36
16
Density, g/cm3 8.8
7.8
Embodied Carbon, kg CO2/kg material 4.0
3.2
Embodied Energy, MJ/kg 62
45
Embodied Water, L/kg 350
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 20 to 380
190 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 1420 to 4770
130 to 310
Stiffness to Weight: Axial, points 7.4
14
Stiffness to Weight: Bending, points 19
25
Strength to Weight: Axial, points 14 to 34
21 to 25
Strength to Weight: Bending, points 15 to 26
20 to 22
Thermal Diffusivity, mm2/s 16
4.1
Thermal Shock Resistance, points 16 to 38
13 to 15

Alloy Composition

Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0
17 to 19
Copper (Cu), % 82.1 to 86
0
Iron (Fe), % 0 to 0.5
65.3 to 74
Lead (Pb), % 0 to 0.020
0
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0.050 to 0.3
0 to 2.0
Nickel (Ni), % 8.5 to 9.5
9.0 to 12
Niobium (Nb), % 0 to 0.1
0
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Tin (Sn), % 5.5 to 6.5
0
Titanium (Ti), % 0
0 to 0.7
Zinc (Zn), % 0 to 0.5
0
Residuals, % 0 to 0.3
0