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ACI-ASTM CF3 Steel vs. AISI 439 Stainless Steel

Both ACI-ASTM CF3 steel and AISI 439 stainless steel are iron alloys. They have 88% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CF3 steel and the bottom bar is AISI 439 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 60
23
Fatigue Strength, MPa 270
170
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 510
490
Tensile Strength: Yield (Proof), MPa 250
250

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 420
530
Maximum Temperature: Mechanical, °C 960
890
Melting Completion (Liquidus), °C 1420
1510
Melting Onset (Solidus), °C 1450
1430
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
25
Thermal Expansion, µm/m-K 16
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 16
9.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.2
2.3
Embodied Energy, MJ/kg 45
34
Embodied Water, L/kg 150
120

Common Calculations

PREN (Pitting Resistance) 20
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
95
Resilience: Unit (Modulus of Resilience), kJ/m3 160
160
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
18
Strength to Weight: Bending, points 18
18
Thermal Diffusivity, mm2/s 4.3
6.7
Thermal Shock Resistance, points 11
16

Alloy Composition

Aluminum (Al), % 0
0 to 0.15
Carbon (C), % 0 to 0.030
0 to 0.030
Chromium (Cr), % 17 to 21
17 to 19
Iron (Fe), % 62.9 to 75
77.1 to 82.8
Manganese (Mn), % 0 to 1.5
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 8.0 to 12
0 to 0.5
Nitrogen (N), % 0
0 to 0.030
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
Titanium (Ti), % 0
0.2 to 1.1