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S21904 Stainless Steel vs. ACI-ASTM CF20 Steel

Both S21904 stainless steel and ACI-ASTM CF20 steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, 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 CF20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17 to 51
50
Fatigue Strength, MPa 380 to 550
240
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
530
Tensile Strength: Yield (Proof), MPa 390 to 910
250

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Maximum Temperature: Corrosion, °C 430
420
Maximum Temperature: Mechanical, °C 980
970
Melting Completion (Liquidus), °C 1400
1420
Melting Onset (Solidus), °C 1350
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
16
Thermal Expansion, µm/m-K 17
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 15
16
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.0
3.1
Embodied Energy, MJ/kg 43
44
Embodied Water, L/kg 160
150

Common Calculations

PREN (Pitting Resistance) 25
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
220
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
160
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 36
19
Strength to Weight: Bending, points 23 to 29
19
Thermal Diffusivity, mm2/s 3.8
4.3
Thermal Shock Resistance, points 15 to 21
11

Alloy Composition

Carbon (C), % 0 to 0.040
0 to 0.2
Chromium (Cr), % 19 to 21.5
18 to 21
Iron (Fe), % 59.5 to 67.4
64.2 to 74
Manganese (Mn), % 8.0 to 10
0 to 1.5
Nickel (Ni), % 5.5 to 7.5
8.0 to 11
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040