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ASTM A229 Spring Steel vs. S32750 Stainless Steel

Both ASTM A229 spring steel and S32750 stainless steel are iron alloys. They have 63% 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 S32750 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 490 to 550
270
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 14
17
Fatigue Strength, MPa 710 to 790
360
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 72
81
Shear Strength, MPa 1020 to 1140
530
Tensile Strength: Ultimate (UTS), MPa 1690 to 1890
860
Tensile Strength: Yield (Proof), MPa 1100 to 1230
590

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 400
1100
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1410
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 50
15
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
21
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
4.1
Embodied Energy, MJ/kg 19
56
Embodied Water, L/kg 46
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
130
Resilience: Unit (Modulus of Resilience), kJ/m3 3260 to 4080
860
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 60 to 67
31
Strength to Weight: Bending, points 40 to 43
26
Thermal Diffusivity, mm2/s 14
4.0
Thermal Shock Resistance, points 54 to 60
25

Alloy Composition

Carbon (C), % 0.55 to 0.85
0 to 0.030
Chromium (Cr), % 0
24 to 26
Copper (Cu), % 0
0 to 0.5
Iron (Fe), % 97.5 to 99
58.1 to 66.8
Manganese (Mn), % 0.3 to 1.2
0 to 1.2
Molybdenum (Mo), % 0
3.0 to 5.0
Nickel (Ni), % 0
6.0 to 8.0
Nitrogen (N), % 0
0.24 to 0.32
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0 to 0.8
Sulfur (S), % 0 to 0.050
0 to 0.020