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ACI-ASTM CF8M Steel vs. S38815 Stainless Steel

Both ACI-ASTM CF8M steel and S38815 stainless steel are iron alloys. They have 89% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CF8M steel and the bottom bar is S38815 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
190
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 50
34
Fatigue Strength, MPa 280
230
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
74
Tensile Strength: Ultimate (UTS), MPa 540
610
Tensile Strength: Yield (Proof), MPa 290
290

Thermal Properties

Latent Heat of Fusion, J/g 300
370
Maximum Temperature: Corrosion, °C 420
400
Maximum Temperature: Mechanical, °C 1000
860
Melting Completion (Liquidus), °C 1440
1360
Melting Onset (Solidus), °C 1400
1310
Specific Heat Capacity, J/kg-K 480
500
Thermal Expansion, µm/m-K 16
15

Otherwise Unclassified Properties

Base Metal Price, % relative 19
19
Density, g/cm3 7.8
7.5
Embodied Carbon, kg CO2/kg material 3.8
3.8
Embodied Energy, MJ/kg 53
54
Embodied Water, L/kg 160
140

Common Calculations

PREN (Pitting Resistance) 28
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
170
Resilience: Unit (Modulus of Resilience), kJ/m3 210
220
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
22
Strength to Weight: Bending, points 19
21
Thermal Shock Resistance, points 12
15

Alloy Composition

Aluminum (Al), % 0
0 to 0.3
Carbon (C), % 0 to 0.080
0 to 0.030
Chromium (Cr), % 18 to 21
13 to 15
Copper (Cu), % 0
0.75 to 1.5
Iron (Fe), % 60.3 to 71
56.1 to 67
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 2.0 to 3.0
0.75 to 1.5
Nickel (Ni), % 9.0 to 12
13 to 17
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
5.5 to 6.5
Sulfur (S), % 0 to 0.040
0 to 0.020