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S82012 Stainless Steel vs. ASTM A231 Spring Steel

Both S82012 stainless steel and ASTM A231 spring steel are iron alloys. They have 77% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is S82012 stainless steel and the bottom bar is ASTM A231 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 40
14
Fatigue Strength, MPa 480
1000
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Shear Strength, MPa 550
1080
Tensile Strength: Ultimate (UTS), MPa 800
1790
Tensile Strength: Yield (Proof), MPa 560
1570

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 950
420
Melting Completion (Liquidus), °C 1430
1460
Melting Onset (Solidus), °C 1380
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
52
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 11
2.3
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.4
2.0
Embodied Energy, MJ/kg 35
28
Embodied Water, L/kg 140
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 290
230
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 29
64
Strength to Weight: Bending, points 25
42
Thermal Diffusivity, mm2/s 3.9
14
Thermal Shock Resistance, points 23
53

Alloy Composition

Carbon (C), % 0 to 0.050
0.48 to 0.53
Chromium (Cr), % 19 to 20.5
0.8 to 1.1
Copper (Cu), % 0 to 1.0
0
Iron (Fe), % 71.3 to 77.9
96.7 to 97.7
Manganese (Mn), % 2.0 to 4.0
0.7 to 0.9
Molybdenum (Mo), % 0.1 to 0.6
0
Nickel (Ni), % 0.8 to 1.5
0
Nitrogen (N), % 0.16 to 0.26
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.8
0.15 to 0.35
Sulfur (S), % 0 to 0.0050
0 to 0.040
Vanadium (V), % 0
0.15 to 0.3