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ASTM A369 Grade FPA vs. ASTM A227 Spring Steel

Both ASTM A369 grade FPA and ASTM A227 spring 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 A369 grade FPA and the bottom bar is ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 110
500 to 640
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 27
12
Fatigue Strength, MPa 180
900 to 1160
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Shear Strength, MPa 240
1030 to 1330
Tensile Strength: Ultimate (UTS), MPa 380
1720 to 2220
Tensile Strength: Yield (Proof), MPa 240
1430 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
400
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 52
52
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.4
Embodied Energy, MJ/kg 18
19
Embodied Water, L/kg 46
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89
200 to 260
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 13
61 to 79
Strength to Weight: Bending, points 15
41 to 48
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 12
55 to 71

Alloy Composition

Carbon (C), % 0 to 0.25
0.45 to 0.85
Iron (Fe), % 98.3 to 99.63
97.4 to 99.1
Manganese (Mn), % 0.27 to 0.93
0.3 to 1.3
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.1 to 0.5
0.15 to 0.35
Sulfur (S), % 0 to 0.035
0 to 0.050