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ACI-ASTM CF8C Steel vs. S21603 Stainless Steel

Both ACI-ASTM CF8C steel and S21603 stainless steel are iron alloys. They have 90% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CF8C steel and the bottom bar is S21603 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
200
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
45
Fatigue Strength, MPa 220
360
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 530
690
Tensile Strength: Yield (Proof), MPa 260
390

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Maximum Temperature: Corrosion, °C 490
420
Maximum Temperature: Mechanical, °C 980
990
Melting Completion (Liquidus), °C 1420
1420
Melting Onset (Solidus), °C 1430
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Expansion, µm/m-K 17
17

Otherwise Unclassified Properties

Base Metal Price, % relative 19
17
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.7
3.6
Embodied Energy, MJ/kg 53
50
Embodied Water, L/kg 150
160

Common Calculations

PREN (Pitting Resistance) 20
34
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
270
Resilience: Unit (Modulus of Resilience), kJ/m3 170
380
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
25
Strength to Weight: Bending, points 19
22
Thermal Shock Resistance, points 11
15

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.030
Chromium (Cr), % 18 to 21
17.5 to 22
Iron (Fe), % 61.8 to 73
57.6 to 67.8
Manganese (Mn), % 0 to 1.5
7.5 to 9.0
Molybdenum (Mo), % 0 to 0.5
2.0 to 3.0
Nickel (Ni), % 9.0 to 12
5.0 to 7.0
Niobium (Nb), % 0 to 1.0
0
Nitrogen (N), % 0
0.25 to 0.5
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 2.0
0 to 0.75
Sulfur (S), % 0 to 0.040
0 to 0.030