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ACI-ASTM CT15C Steel vs. AISI 321H Stainless Steel

Both ACI-ASTM CT15C steel and AISI 321H stainless steel are iron alloys. They have 75% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, 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 321H stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 23
40
Fatigue Strength, MPa 130
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
77
Tensile Strength: Ultimate (UTS), MPa 500
580
Tensile Strength: Yield (Proof), MPa 190
230

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Maximum Temperature: Corrosion, °C 560
480
Maximum Temperature: Mechanical, °C 1080
940
Melting Completion (Liquidus), °C 1410
1430
Melting Onset (Solidus), °C 1360
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 16
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 36
16
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 6.1
3.2
Embodied Energy, MJ/kg 88
46
Embodied Water, L/kg 190
140

Common Calculations

PREN (Pitting Resistance) 20
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 90
190
Resilience: Unit (Modulus of Resilience), kJ/m3 93
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17
21
Strength to Weight: Bending, points 17
20
Thermal Diffusivity, mm2/s 3.2
4.0
Thermal Shock Resistance, points 12
12

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.040 to 0.1
Chromium (Cr), % 19 to 21
17 to 19
Iron (Fe), % 40.3 to 49.2
65.4 to 74
Manganese (Mn), % 0.15 to 1.5
0 to 2.0
Nickel (Ni), % 31 to 34
9.0 to 12
Niobium (Nb), % 0.5 to 1.5
0
Phosphorus (P), % 0 to 0.030
0 to 0.045
Silicon (Si), % 0.15 to 1.5
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Titanium (Ti), % 0
0 to 0.7