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S21904 Stainless Steel vs. ACI-ASTM CD3MCuN Steel

Both S21904 stainless steel and ACI-ASTM CD3MCuN steel are iron alloys. They have 90% 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 S21904 stainless steel and the bottom bar is ACI-ASTM CD3MCuN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17 to 51
29
Fatigue Strength, MPa 380 to 550
370
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 78
80
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
790
Tensile Strength: Yield (Proof), MPa 390 to 910
500

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Maximum Temperature: Corrosion, °C 430
450
Maximum Temperature: Mechanical, °C 980
1100
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1350
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
15
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 15
20
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.0
3.9
Embodied Energy, MJ/kg 43
54
Embodied Water, L/kg 160
180

Common Calculations

PREN (Pitting Resistance) 25
41
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
200
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
620
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 36
28
Strength to Weight: Bending, points 23 to 29
24
Thermal Diffusivity, mm2/s 3.8
4.1
Thermal Shock Resistance, points 15 to 21
22

Alloy Composition

Carbon (C), % 0 to 0.040
0 to 0.030
Chromium (Cr), % 19 to 21.5
24 to 26.7
Copper (Cu), % 0
1.4 to 1.9
Iron (Fe), % 59.5 to 67.4
58.2 to 65.9
Manganese (Mn), % 8.0 to 10
0 to 1.2
Molybdenum (Mo), % 0
2.9 to 3.8
Nickel (Ni), % 5.5 to 7.5
5.6 to 6.7
Nitrogen (N), % 0.15 to 0.4
0.22 to 0.33
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 1.1
Sulfur (S), % 0 to 0.030
0 to 0.030