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AISI 309 Stainless Steel vs. ACI-ASTM CF8C Steel

Both AISI 309 stainless steel and ACI-ASTM CF8C steel are iron alloys. They have a moderately high 93% 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 AISI 309 stainless steel and the bottom bar is ACI-ASTM CF8C steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 210
150
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34 to 47
40
Fatigue Strength, MPa 250 to 280
220
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 600 to 710
530
Tensile Strength: Yield (Proof), MPa 260 to 350
260

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Maximum Temperature: Corrosion, °C 440
490
Maximum Temperature: Mechanical, °C 980
980
Melting Completion (Liquidus), °C 1450
1420
Melting Onset (Solidus), °C 1400
1430
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
16
Thermal Expansion, µm/m-K 15
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 19
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.6
3.7
Embodied Energy, MJ/kg 51
53
Embodied Water, L/kg 170
150

Common Calculations

PREN (Pitting Resistance) 23
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
180
Resilience: Unit (Modulus of Resilience), kJ/m3 170 to 310
170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21 to 25
19
Strength to Weight: Bending, points 20 to 23
19
Thermal Diffusivity, mm2/s 4.3
4.3
Thermal Shock Resistance, points 14 to 16
11

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.080
Chromium (Cr), % 22 to 24
18 to 21
Iron (Fe), % 58 to 66
61.8 to 73
Manganese (Mn), % 0 to 2.0
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 12 to 15
9.0 to 12
Niobium (Nb), % 0
0 to 1.0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040