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ACI-ASTM CD3MCuN Steel vs. S21640 Stainless Steel

Both ACI-ASTM CD3MCuN steel and S21640 stainless steel are iron alloys. They have 88% of their average alloy composition in common. 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 ACI-ASTM CD3MCuN steel and the bottom bar is S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 29
46
Fatigue Strength, MPa 370
320
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 80
78
Tensile Strength: Ultimate (UTS), MPa 790
740
Tensile Strength: Yield (Proof), MPa 500
350

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 450
490
Maximum Temperature: Mechanical, °C 1100
940
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1390
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 20
17
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.9
3.6
Embodied Energy, MJ/kg 54
51
Embodied Water, L/kg 180
150

Common Calculations

PREN (Pitting Resistance) 41
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
280
Resilience: Unit (Modulus of Resilience), kJ/m3 620
300
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28
27
Strength to Weight: Bending, points 24
23
Thermal Diffusivity, mm2/s 4.1
4.0
Thermal Shock Resistance, points 22
16

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.080
Chromium (Cr), % 24 to 26.7
17.5 to 19.5
Copper (Cu), % 1.4 to 1.9
0
Iron (Fe), % 58.2 to 65.9
63 to 74.3
Manganese (Mn), % 0 to 1.2
3.5 to 6.5
Molybdenum (Mo), % 2.9 to 3.8
0.5 to 2.0
Nickel (Ni), % 5.6 to 6.7
4.0 to 6.5
Niobium (Nb), % 0
0.1 to 1.0
Nitrogen (N), % 0.22 to 0.33
0.080 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.060
Silicon (Si), % 0 to 1.1
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030