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S21904 Stainless Steel vs. ACI-ASTM CT15C Steel

Both S21904 stainless steel and ACI-ASTM CT15C steel are iron alloys. They have 73% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is S21904 stainless steel and the bottom bar is ACI-ASTM CT15C steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
140
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17 to 51
23
Fatigue Strength, MPa 380 to 550
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
76
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
500
Tensile Strength: Yield (Proof), MPa 390 to 910
190

Thermal Properties

Latent Heat of Fusion, J/g 290
310
Maximum Temperature: Corrosion, °C 430
560
Maximum Temperature: Mechanical, °C 980
1080
Melting Completion (Liquidus), °C 1400
1410
Melting Onset (Solidus), °C 1350
1360
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 14
12
Thermal Expansion, µm/m-K 17
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 15
36
Density, g/cm3 7.7
8.0
Embodied Carbon, kg CO2/kg material 3.0
6.1
Embodied Energy, MJ/kg 43
88
Embodied Water, L/kg 160
190

Common Calculations

PREN (Pitting Resistance) 25
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
90
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
93
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25 to 36
17
Strength to Weight: Bending, points 23 to 29
17
Thermal Diffusivity, mm2/s 3.8
3.2
Thermal Shock Resistance, points 15 to 21
12

Alloy Composition

Carbon (C), % 0 to 0.040
0.050 to 0.15
Chromium (Cr), % 19 to 21.5
19 to 21
Iron (Fe), % 59.5 to 67.4
40.3 to 49.2
Manganese (Mn), % 8.0 to 10
0.15 to 1.5
Nickel (Ni), % 5.5 to 7.5
31 to 34
Niobium (Nb), % 0
0.5 to 1.5
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0 to 0.030
Silicon (Si), % 0 to 1.0
0.15 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.030