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ASTM A227 Spring Steel vs. SAE-AISI 50B60 Steel

Both ASTM A227 spring steel and SAE-AISI 50B60 steel are iron alloys. Their average alloy composition is basically identical. There are 30 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is ASTM A227 spring steel and the bottom bar is SAE-AISI 50B60 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 500 to 640
180 to 190
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12
12 to 20
Fatigue Strength, MPa 900 to 1160
240 to 330
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
72
Shear Strength, MPa 1030 to 1330
380
Tensile Strength: Ultimate (UTS), MPa 1720 to 2220
610 to 630
Tensile Strength: Yield (Proof), MPa 1430 to 1850
350 to 530

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
410
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 52
45
Thermal Expansion, µm/m-K 12
12

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
2.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.4
Embodied Energy, MJ/kg 19
19
Embodied Water, L/kg 46
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 260
71 to 100
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 61 to 79
22 to 23
Strength to Weight: Bending, points 41 to 48
20 to 21
Thermal Diffusivity, mm2/s 14
12
Thermal Shock Resistance, points 55 to 71
20

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0.45 to 0.85
0.56 to 0.64
Chromium (Cr), % 0
0.4 to 0.6
Iron (Fe), % 97.4 to 99.1
97.3 to 98.1
Manganese (Mn), % 0.3 to 1.3
0.75 to 1.0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0.15 to 0.35
Sulfur (S), % 0 to 0.050
0 to 0.040