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ASTM A229 Spring Steel vs. S32950 Stainless Steel

Both ASTM A229 spring steel and S32950 stainless steel are iron alloys. They have 66% of their average alloy composition in common. There are 31 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 ASTM A229 spring steel and the bottom bar is S32950 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 490 to 550
260
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 14
17
Fatigue Strength, MPa 710 to 790
330
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 72
80
Shear Strength, MPa 1020 to 1140
480
Tensile Strength: Ultimate (UTS), MPa 1690 to 1890
780
Tensile Strength: Yield (Proof), MPa 1100 to 1230
550

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 400
1100
Melting Completion (Liquidus), °C 1450
1430
Melting Onset (Solidus), °C 1410
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 50
16
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
17
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.4
3.4
Embodied Energy, MJ/kg 19
47
Embodied Water, L/kg 46
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
120
Resilience: Unit (Modulus of Resilience), kJ/m3 3260 to 4080
730
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 60 to 67
28
Strength to Weight: Bending, points 40 to 43
24
Thermal Diffusivity, mm2/s 14
4.3
Thermal Shock Resistance, points 54 to 60
21

Alloy Composition

Carbon (C), % 0.55 to 0.85
0 to 0.030
Chromium (Cr), % 0
26 to 29
Iron (Fe), % 97.5 to 99
60.3 to 69.4
Manganese (Mn), % 0.3 to 1.2
0 to 2.0
Molybdenum (Mo), % 0
1.0 to 2.5
Nickel (Ni), % 0
3.5 to 5.2
Nitrogen (N), % 0
0.15 to 0.35
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0 to 0.6
Sulfur (S), % 0 to 0.050
0 to 0.010