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ACI-ASTM CA40 Steel vs. S21800 Stainless Steel

Both ACI-ASTM CA40 steel and S21800 stainless steel are iron alloys. They have 77% 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 CA40 steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 310
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 10
40
Fatigue Strength, MPa 460
330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
75
Tensile Strength: Ultimate (UTS), MPa 910
740
Tensile Strength: Yield (Proof), MPa 860
390

Thermal Properties

Latent Heat of Fusion, J/g 280
340
Maximum Temperature: Corrosion, °C 390
410
Maximum Temperature: Mechanical, °C 750
900
Melting Completion (Liquidus), °C 1440
1360
Melting Onset (Solidus), °C 1500
1310
Specific Heat Capacity, J/kg-K 480
500
Thermal Expansion, µm/m-K 10
16

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
15
Density, g/cm3 7.7
7.5
Embodied Carbon, kg CO2/kg material 2.0
3.1
Embodied Energy, MJ/kg 28
45
Embodied Water, L/kg 100
150

Common Calculations

PREN (Pitting Resistance) 14
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 89
250
Resilience: Unit (Modulus of Resilience), kJ/m3 1910
390
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
26
Strength to Weight: Axial, points 33
27
Strength to Weight: Bending, points 27
24
Thermal Shock Resistance, points 33
17

Alloy Composition

Carbon (C), % 0.2 to 0.4
0 to 0.1
Chromium (Cr), % 11.5 to 14
16 to 18
Iron (Fe), % 81.5 to 88.3
59.1 to 65.4
Manganese (Mn), % 0 to 1.0
7.0 to 9.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 1.0
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.040
0 to 0.060
Silicon (Si), % 0 to 1.5
3.5 to 4.5
Sulfur (S), % 0 to 0.040
0 to 0.030