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AWS E309LMo vs. ASTM A227 Spring Steel

Both AWS E309LMo and ASTM A227 spring steel are iron alloys. They have 60% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is AWS E309LMo and the bottom bar is ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 34
12
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 79
72
Tensile Strength: Ultimate (UTS), MPa 580
1720 to 2220

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Melting Completion (Liquidus), °C 1430
1450
Melting Onset (Solidus), °C 1390
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
52
Thermal Expansion, µm/m-K 14
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 22
1.8
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 4.2
1.4
Embodied Energy, MJ/kg 59
19
Embodied Water, L/kg 180
46

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21
61 to 79
Strength to Weight: Bending, points 20
41 to 48
Thermal Diffusivity, mm2/s 3.9
14
Thermal Shock Resistance, points 15
55 to 71

Alloy Composition

Carbon (C), % 0 to 0.040
0.45 to 0.85
Chromium (Cr), % 22 to 25
0
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 53.6 to 63.5
97.4 to 99.1
Manganese (Mn), % 0.5 to 2.5
0.3 to 1.3
Molybdenum (Mo), % 2.0 to 3.0
0
Nickel (Ni), % 12 to 14
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 0.050