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ACI-ASTM CF8C Steel vs. AISI 440C Stainless Steel

Both ACI-ASTM CF8C steel and AISI 440C stainless steel are iron alloys. They have 86% of their average alloy composition in common. There are 30 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 CF8C steel and the bottom bar is AISI 440C stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
2.0 to 14
Fatigue Strength, MPa 220
260 to 840
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
76
Tensile Strength: Ultimate (UTS), MPa 530
710 to 1970
Tensile Strength: Yield (Proof), MPa 260
450 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 490
390
Maximum Temperature: Mechanical, °C 980
870
Melting Completion (Liquidus), °C 1420
1480
Melting Onset (Solidus), °C 1430
1370
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
22
Thermal Expansion, µm/m-K 17
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.8

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
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
39 to 88
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
26 to 71
Strength to Weight: Bending, points 19
23 to 46
Thermal Diffusivity, mm2/s 4.3
6.0
Thermal Shock Resistance, points 11
26 to 71

Alloy Composition

Carbon (C), % 0 to 0.080
1.0 to 1.2
Chromium (Cr), % 18 to 21
16 to 18
Iron (Fe), % 61.8 to 73
78 to 83.1
Manganese (Mn), % 0 to 1.5
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
0 to 0.75
Nickel (Ni), % 9.0 to 12
0
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 0.015