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ASTM A227 Spring Steel vs. AWS BAg-4

ASTM A227 spring steel belongs to the iron alloys classification, while AWS BAg-4 belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is ASTM A227 spring steel and the bottom bar is AWS BAg-4.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
91
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 72
34
Tensile Strength: Ultimate (UTS), MPa 1720 to 2220
150

Thermal Properties

Latent Heat of Fusion, J/g 250
140
Melting Completion (Liquidus), °C 1450
780
Melting Onset (Solidus), °C 1410
670
Specific Heat Capacity, J/kg-K 470
330
Thermal Expansion, µm/m-K 12
21

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.9
Embodied Carbon, kg CO2/kg material 1.4
40
Embodied Energy, MJ/kg 19
630

Common Calculations

Stiffness to Weight: Axial, points 13
5.7
Stiffness to Weight: Bending, points 24
17
Strength to Weight: Axial, points 61 to 79
4.7
Strength to Weight: Bending, points 41 to 48
7.1
Thermal Shock Resistance, points 55 to 71
5.7

Alloy Composition

Carbon (C), % 0.45 to 0.85
0
Copper (Cu), % 0
29 to 31
Iron (Fe), % 97.4 to 99.1
0
Manganese (Mn), % 0.3 to 1.3
0
Nickel (Ni), % 0
1.5 to 2.5
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0.15 to 0.35
0
Silver (Ag), % 0
39 to 41
Sulfur (S), % 0 to 0.050
0
Zinc (Zn), % 0
26 to 30
Residuals, % 0
0 to 0.15