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

Both AISI 321H stainless steel and ACI-ASTM CT15C 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 AISI 321H stainless steel and the bottom bar is ACI-ASTM CT15C steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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