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ACI-ASTM CF20 Steel vs. AISI 434 Stainless Steel

Both ACI-ASTM CF20 steel and AISI 434 stainless steel are iron alloys. They have 87% of their average alloy composition in common. There are 32 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 ACI-ASTM CF20 steel and the bottom bar is AISI 434 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
170
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 50
24
Fatigue Strength, MPa 240
220
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 530
520
Tensile Strength: Yield (Proof), MPa 250
320

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 420
410
Maximum Temperature: Mechanical, °C 970
880
Melting Completion (Liquidus), °C 1420
1510
Melting Onset (Solidus), °C 1410
1430
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
25
Thermal Expansion, µm/m-K 17
10

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 16
9.5
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.1
2.4
Embodied Energy, MJ/kg 44
33
Embodied Water, L/kg 150
120

Common Calculations

PREN (Pitting Resistance) 20
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
110
Resilience: Unit (Modulus of Resilience), kJ/m3 160
260
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
19
Strength to Weight: Bending, points 19
18
Thermal Diffusivity, mm2/s 4.3
6.7
Thermal Shock Resistance, points 11
19

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.12
Chromium (Cr), % 18 to 21
16 to 18
Iron (Fe), % 64.2 to 74
78.6 to 83.3
Manganese (Mn), % 0 to 1.5
0 to 1.0
Molybdenum (Mo), % 0
0.75 to 1.3
Nickel (Ni), % 8.0 to 11
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030