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ACI-ASTM CA15M Steel vs. AISI 321 Stainless Steel

Both ACI-ASTM CA15M steel and AISI 321 stainless steel are iron alloys. They have 84% 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 CA15M steel and the bottom bar is AISI 321 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
170 to 210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 20
34 to 50
Fatigue Strength, MPa 330
220 to 270
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
77
Tensile Strength: Ultimate (UTS), MPa 690
590 to 690
Tensile Strength: Yield (Proof), MPa 510
220 to 350

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Corrosion, °C 390
480
Maximum Temperature: Mechanical, °C 760
870
Melting Completion (Liquidus), °C 1450
1430
Melting Onset (Solidus), °C 1410
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 27
16
Thermal Expansion, µm/m-K 10
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
16
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.1
3.2
Embodied Energy, MJ/kg 29
45
Embodied Water, L/kg 100
140

Common Calculations

PREN (Pitting Resistance) 15
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
190 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 670
130 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25
21 to 25
Strength to Weight: Bending, points 22
20 to 22
Thermal Diffusivity, mm2/s 7.2
4.1
Thermal Shock Resistance, points 25
13 to 15

Alloy Composition

Carbon (C), % 0 to 0.15
0 to 0.080
Chromium (Cr), % 11.5 to 14
17 to 19
Iron (Fe), % 82.1 to 88.4
65.3 to 74
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 0.15 to 1.0
0
Nickel (Ni), % 0 to 1.0
9.0 to 12
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 0.65
0 to 0.75
Sulfur (S), % 0 to 0.040
0 to 0.030
Titanium (Ti), % 0
0 to 0.7