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ACI-ASTM CT15C Steel vs. AISI 431 Stainless Steel

Both ACI-ASTM CT15C steel and AISI 431 stainless steel are iron alloys. They have 64% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CT15C steel and the bottom bar is AISI 431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
250
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 23
15 to 17
Fatigue Strength, MPa 130
430 to 610
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
77
Tensile Strength: Ultimate (UTS), MPa 500
890 to 1380
Tensile Strength: Yield (Proof), MPa 190
710 to 1040

Thermal Properties

Latent Heat of Fusion, J/g 310
280
Maximum Temperature: Corrosion, °C 560
400
Maximum Temperature: Mechanical, °C 1080
850
Melting Completion (Liquidus), °C 1410
1510
Melting Onset (Solidus), °C 1360
1450
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 12
26
Thermal Expansion, µm/m-K 16
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 36
9.0
Density, g/cm3 8.0
7.7
Embodied Carbon, kg CO2/kg material 6.1
2.2
Embodied Energy, MJ/kg 88
31
Embodied Water, L/kg 190
120

Common Calculations

PREN (Pitting Resistance) 20
16
Resilience: Ultimate (Unit Rupture Work), MJ/m3 90
140 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 93
1270 to 2770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17
32 to 50
Strength to Weight: Bending, points 17
27 to 36
Thermal Diffusivity, mm2/s 3.2
7.0
Thermal Shock Resistance, points 12
28 to 43

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.2
Chromium (Cr), % 19 to 21
15 to 17
Iron (Fe), % 40.3 to 49.2
78.2 to 83.8
Manganese (Mn), % 0.15 to 1.5
0 to 1.0
Nickel (Ni), % 31 to 34
1.3 to 2.5
Niobium (Nb), % 0.5 to 1.5
0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.15 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030