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S42030 Stainless Steel vs. SAE-AISI 8720 Steel

Both S42030 stainless steel and SAE-AISI 8720 steel are iron alloys. Both are furnished in the annealed condition. They have 83% of their average alloy composition in common. There are 30 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 S42030 stainless steel and the bottom bar is SAE-AISI 8720 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 16
25
Fatigue Strength, MPa 250
240
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Shear Strength, MPa 410
320
Tensile Strength: Ultimate (UTS), MPa 670
500
Tensile Strength: Yield (Proof), MPa 410
330

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 780
410
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 28
39
Thermal Expansion, µm/m-K 10
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.7
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 10
2.6
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.5
1.5
Embodied Energy, MJ/kg 34
20
Embodied Water, L/kg 110
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 92
110
Resilience: Unit (Modulus of Resilience), kJ/m3 440
290
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24
18
Strength to Weight: Bending, points 22
18
Thermal Diffusivity, mm2/s 7.7
10
Thermal Shock Resistance, points 24
17

Alloy Composition

Carbon (C), % 0 to 0.3
0.18 to 0.23
Chromium (Cr), % 12 to 14
0.4 to 0.6
Copper (Cu), % 2.0 to 3.0
0
Iron (Fe), % 77.6 to 85
96.8 to 98
Manganese (Mn), % 0 to 1.0
0.7 to 0.9
Molybdenum (Mo), % 1.0 to 3.0
0.2 to 0.3
Nickel (Ni), % 0
0.4 to 0.7
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040