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ACI-ASTM CF8 Steel vs. S15500 Stainless Steel

Both ACI-ASTM CF8 steel and S15500 stainless steel are iron alloys. They have 89% 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 CF8 steel and the bottom bar is S15500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
290 to 430
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 55
6.8 to 16
Fatigue Strength, MPa 260
350 to 650
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
75
Tensile Strength: Ultimate (UTS), MPa 540
890 to 1490
Tensile Strength: Yield (Proof), MPa 260
590 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 420
440
Maximum Temperature: Mechanical, °C 980
820
Melting Completion (Liquidus), °C 1420
1430
Melting Onset (Solidus), °C 1430
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
17
Thermal Expansion, µm/m-K 15
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 16
13
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.1
2.7
Embodied Energy, MJ/kg 44
39
Embodied Water, L/kg 150
130

Common Calculations

PREN (Pitting Resistance) 20
15
Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
98 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 160
890 to 4460
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
32 to 53
Strength to Weight: Bending, points 19
26 to 37
Thermal Diffusivity, mm2/s 4.3
4.6
Thermal Shock Resistance, points 13
30 to 50

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.070
Chromium (Cr), % 18 to 21
14 to 15.5
Copper (Cu), % 0
2.5 to 4.5
Iron (Fe), % 63.8 to 74
71.9 to 79.9
Manganese (Mn), % 0 to 1.5
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 8.0 to 11
3.5 to 5.5
Niobium (Nb), % 0
0.15 to 0.45
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