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S32550 Stainless Steel vs. ASTM A231 Spring Steel

Both S32550 stainless steel and ASTM A231 spring steel are iron alloys. They have 64% 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 S32550 stainless steel and the bottom bar is ASTM A231 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 260
540
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 21
14
Fatigue Strength, MPa 400
1000
Poisson's Ratio 0.27
0.29
Reduction in Area, % 57
46
Shear Modulus, GPa 80
73
Shear Strength, MPa 540
1080
Tensile Strength: Ultimate (UTS), MPa 860
1790
Tensile Strength: Yield (Proof), MPa 620
1570

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
420
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1390
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
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 20
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.8
2.0
Embodied Energy, MJ/kg 53
28
Embodied Water, L/kg 180
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
230
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 31
64
Strength to Weight: Bending, points 26
42
Thermal Diffusivity, mm2/s 4.4
14
Thermal Shock Resistance, points 23
53

Alloy Composition

Carbon (C), % 0 to 0.040
0.48 to 0.53
Chromium (Cr), % 24 to 27
0.8 to 1.1
Copper (Cu), % 1.5 to 2.5
0
Iron (Fe), % 57.2 to 67
96.7 to 97.7
Manganese (Mn), % 0 to 1.5
0.7 to 0.9
Molybdenum (Mo), % 2.9 to 3.9
0
Nickel (Ni), % 4.5 to 6.5
0
Nitrogen (N), % 0.1 to 0.25
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Vanadium (V), % 0
0.15 to 0.3