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ASTM A229 Spring Steel vs. ASTM A369 Grade FPB

Both ASTM A229 spring steel and ASTM A369 grade FPB are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is ASTM A229 spring steel and the bottom bar is ASTM A369 grade FPB.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 490 to 550
140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14
19
Fatigue Strength, MPa 710 to 790
180
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 1020 to 1140
290
Tensile Strength: Ultimate (UTS), MPa 1690 to 1890
470
Tensile Strength: Yield (Proof), MPa 1100 to 1230
270

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
400
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 50
52
Thermal Expansion, µm/m-K 12
12

Electrical Properties

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

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 19
18
Embodied Water, L/kg 46
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
78
Resilience: Unit (Modulus of Resilience), kJ/m3 3260 to 4080
190
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 60 to 67
17
Strength to Weight: Bending, points 40 to 43
17
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 54 to 60
15

Alloy Composition

Carbon (C), % 0.55 to 0.85
0 to 0.3
Iron (Fe), % 97.5 to 99
98.1 to 99.61
Manganese (Mn), % 0.3 to 1.2
0.29 to 1.1
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0.1 to 0.5
Sulfur (S), % 0 to 0.050
0 to 0.035