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S21800 Stainless Steel vs. ACI-ASTM CT15C Steel

Both S21800 stainless steel and ACI-ASTM CT15C steel are iron alloys. They have 72% 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 S21800 stainless steel and the bottom bar is ACI-ASTM CT15C steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
140
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 40
23
Fatigue Strength, MPa 330
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
76
Tensile Strength: Ultimate (UTS), MPa 740
500
Tensile Strength: Yield (Proof), MPa 390
190

Thermal Properties

Latent Heat of Fusion, J/g 340
310
Maximum Temperature: Corrosion, °C 410
560
Maximum Temperature: Mechanical, °C 900
1080
Melting Completion (Liquidus), °C 1360
1410
Melting Onset (Solidus), °C 1310
1360
Specific Heat Capacity, J/kg-K 500
470
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 15
36
Density, g/cm3 7.5
8.0
Embodied Carbon, kg CO2/kg material 3.1
6.1
Embodied Energy, MJ/kg 45
88
Embodied Water, L/kg 150
190

Common Calculations

PREN (Pitting Resistance) 19
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
90
Resilience: Unit (Modulus of Resilience), kJ/m3 390
93
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 27
17
Strength to Weight: Bending, points 24
17
Thermal Shock Resistance, points 17
12

Alloy Composition

Carbon (C), % 0 to 0.1
0.050 to 0.15
Chromium (Cr), % 16 to 18
19 to 21
Iron (Fe), % 59.1 to 65.4
40.3 to 49.2
Manganese (Mn), % 7.0 to 9.0
0.15 to 1.5
Nickel (Ni), % 8.0 to 9.0
31 to 34
Niobium (Nb), % 0
0.5 to 1.5
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.060
0 to 0.030
Silicon (Si), % 3.5 to 4.5
0.15 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.030