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ACI-ASTM CD6MN Steel vs. S21904 Stainless Steel

Both ACI-ASTM CD6MN steel and S21904 stainless 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 ACI-ASTM CD6MN steel and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 28
17 to 51
Fatigue Strength, MPa 370
380 to 550
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 80
78
Tensile Strength: Ultimate (UTS), MPa 730
700 to 1000
Tensile Strength: Yield (Proof), MPa 510
390 to 910

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 450
430
Maximum Temperature: Mechanical, °C 1100
980
Melting Completion (Liquidus), °C 1440
1400
Melting Onset (Solidus), °C 1390
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
14
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 17
15
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.4
3.0
Embodied Energy, MJ/kg 48
43
Embodied Water, L/kg 170
160

Common Calculations

PREN (Pitting Resistance) 36
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
160 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 650
380 to 2070
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 26
25 to 36
Strength to Weight: Bending, points 23
23 to 29
Thermal Diffusivity, mm2/s 4.4
3.8
Thermal Shock Resistance, points 20
15 to 21

Alloy Composition

Carbon (C), % 0 to 0.060
0 to 0.040
Chromium (Cr), % 24 to 27
19 to 21.5
Iron (Fe), % 62.1 to 70.1
59.5 to 67.4
Manganese (Mn), % 0 to 1.0
8.0 to 10
Molybdenum (Mo), % 1.8 to 2.5
0
Nickel (Ni), % 4.0 to 6.0
5.5 to 7.5
Nitrogen (N), % 0.15 to 0.25
0.15 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030