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S82121 Stainless Steel vs. ACI-ASTM CD4MCuN Steel

Both S82121 stainless steel and ACI-ASTM CD4MCuN steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is S82121 stainless steel and the bottom bar is ACI-ASTM CD4MCuN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 28
18
Fatigue Strength, MPa 370
340
Poisson's Ratio 0.27
0.27
Shear Modulus, GPa 78
79
Tensile Strength: Ultimate (UTS), MPa 730
770
Tensile Strength: Yield (Proof), MPa 510
550

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Maximum Temperature: Corrosion, °C 430
450
Maximum Temperature: Mechanical, °C 1020
1100
Melting Completion (Liquidus), °C 1430
1420
Melting Onset (Solidus), °C 1380
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
17
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 14
18
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.8
3.5
Embodied Energy, MJ/kg 40
49
Embodied Water, L/kg 150
180

Common Calculations

PREN (Pitting Resistance) 28
35
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
130
Resilience: Unit (Modulus of Resilience), kJ/m3 660
760
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 26
28
Strength to Weight: Bending, points 23
24
Thermal Diffusivity, mm2/s 4.0
4.5
Thermal Shock Resistance, points 20
21

Alloy Composition

Carbon (C), % 0 to 0.035
0 to 0.040
Chromium (Cr), % 21 to 23
24.5 to 26.5
Copper (Cu), % 0.2 to 1.2
2.7 to 3.3
Iron (Fe), % 66.7 to 75.4
59.5 to 66.3
Manganese (Mn), % 1.0 to 2.5
0 to 1.0
Molybdenum (Mo), % 0.3 to 1.3
1.7 to 2.3
Nickel (Ni), % 2.0 to 4.0
4.7 to 6.0
Nitrogen (N), % 0.15 to 0.25
0.1 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.040