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ACI-ASTM CA6NM Steel vs. S21904 Stainless Steel

Both ACI-ASTM CA6NM steel and S21904 stainless steel are iron alloys. They have 81% of their average alloy composition in common. There are 32 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 CA6NM steel and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
210 to 300
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
17 to 51
Fatigue Strength, MPa 380
380 to 550
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
78
Tensile Strength: Ultimate (UTS), MPa 850
700 to 1000
Tensile Strength: Yield (Proof), MPa 620
390 to 910

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 390
430
Maximum Temperature: Mechanical, °C 770
980
Melting Completion (Liquidus), °C 1450
1400
Melting Onset (Solidus), °C 1400
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
14
Thermal Expansion, µm/m-K 10
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 3.2
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 10
15
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.5
3.0
Embodied Energy, MJ/kg 34
43
Embodied Water, L/kg 110
160

Common Calculations

PREN (Pitting Resistance) 15
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
160 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 1000
380 to 2070
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 30
25 to 36
Strength to Weight: Bending, points 26
23 to 29
Thermal Diffusivity, mm2/s 6.7
3.8
Thermal Shock Resistance, points 31
15 to 21

Alloy Composition

Carbon (C), % 0 to 0.060
0 to 0.040
Chromium (Cr), % 11.5 to 14
19 to 21.5
Iron (Fe), % 78.4 to 84.6
59.5 to 67.4
Manganese (Mn), % 0 to 1.0
8.0 to 10
Molybdenum (Mo), % 0.4 to 1.0
0
Nickel (Ni), % 3.5 to 4.5
5.5 to 7.5
Nitrogen (N), % 0
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 0.030
0 to 0.030