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AISI 384 Stainless Steel vs. ACI-ASTM CF20 Steel

Both AISI 384 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 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is AISI 384 stainless steel and the bottom bar is ACI-ASTM CF20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
77
Tensile Strength: Ultimate (UTS), MPa 480
530

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Maximum Temperature: Corrosion, °C 410
420
Maximum Temperature: Mechanical, °C 910
970
Melting Completion (Liquidus), °C 1420
1420
Melting Onset (Solidus), °C 1380
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
16
Thermal Expansion, µm/m-K 16
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 20
16
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 3.7
3.1
Embodied Energy, MJ/kg 52
44
Embodied Water, L/kg 150
150

Common Calculations

PREN (Pitting Resistance) 16
20
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17
19
Strength to Weight: Bending, points 17
19
Thermal Diffusivity, mm2/s 4.3
4.3
Thermal Shock Resistance, points 11
11

Alloy Composition

Carbon (C), % 0 to 0.040
0 to 0.2
Chromium (Cr), % 15 to 17
18 to 21
Iron (Fe), % 60.9 to 68
64.2 to 74
Manganese (Mn), % 0 to 2.0
0 to 1.5
Nickel (Ni), % 17 to 19
8.0 to 11
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