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ACI-ASTM CF8C Steel vs. AISI 431 Stainless Steel

Both ACI-ASTM CF8C steel and AISI 431 stainless steel are iron alloys. They have 86% 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 CF8C steel and the bottom bar is AISI 431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
250
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
15 to 17
Fatigue Strength, MPa 220
430 to 610
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 530
890 to 1380
Tensile Strength: Yield (Proof), MPa 260
710 to 1040

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 490
400
Maximum Temperature: Mechanical, °C 980
850
Melting Completion (Liquidus), °C 1420
1510
Melting Onset (Solidus), °C 1430
1450
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
26
Thermal Expansion, µm/m-K 17
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 19
9.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.7
2.2
Embodied Energy, MJ/kg 53
31
Embodied Water, L/kg 150
120

Common Calculations

PREN (Pitting Resistance) 20
16
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
140 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 170
1270 to 2770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
32 to 50
Strength to Weight: Bending, points 19
27 to 36
Thermal Diffusivity, mm2/s 4.3
7.0
Thermal Shock Resistance, points 11
28 to 43

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.2
Chromium (Cr), % 18 to 21
15 to 17
Iron (Fe), % 61.8 to 73
78.2 to 83.8
Manganese (Mn), % 0 to 1.5
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 9.0 to 12
1.3 to 2.5
Niobium (Nb), % 0 to 1.0
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