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SAE-AISI 1015 Steel vs. S81921 Stainless Steel

Both SAE-AISI 1015 steel and S81921 stainless steel are iron alloys. They have 72% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1015 steel and the bottom bar is S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
260
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20 to 32
29
Fatigue Strength, MPa 170 to 250
370
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
79
Shear Strength, MPa 260 to 270
460
Tensile Strength: Ultimate (UTS), MPa 390 to 440
710
Tensile Strength: Yield (Proof), MPa 210 to 370
500

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 400
990
Melting Completion (Liquidus), °C 1470
1430
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 52
15
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 6.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 7.9
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
14
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 1.4
2.9
Embodied Energy, MJ/kg 18
41
Embodied Water, L/kg 45
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
180
Resilience: Unit (Modulus of Resilience), kJ/m3 120 to 360
630
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 14 to 15
25
Strength to Weight: Bending, points 15 to 16
23
Thermal Diffusivity, mm2/s 14
4.0
Thermal Shock Resistance, points 12 to 14
20

Alloy Composition

Carbon (C), % 0.13 to 0.18
0 to 0.030
Chromium (Cr), % 0
19 to 22
Iron (Fe), % 99.13 to 99.57
66.7 to 75.9
Manganese (Mn), % 0.3 to 0.6
2.0 to 4.0
Molybdenum (Mo), % 0
1.0 to 2.0
Nickel (Ni), % 0
2.0 to 4.0
Nitrogen (N), % 0
0.14 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0 to 0.050
0 to 0.030