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ASTM A369 Grade FP12 vs. ASTM A231 Spring Steel

Both ASTM A369 grade FP12 and ASTM A231 spring steel are iron alloys. They have a very high 99% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ASTM A369 grade FP12 and the bottom bar is ASTM A231 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
540
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
14
Fatigue Strength, MPa 170
1000
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 300
1080
Tensile Strength: Ultimate (UTS), MPa 470
1790
Tensile Strength: Yield (Proof), MPa 250
1570

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 430
420
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 45
52
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
2.3
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6
2.0
Embodied Energy, MJ/kg 21
28
Embodied Water, L/kg 52
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 81
230
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
64
Strength to Weight: Bending, points 17
42
Thermal Diffusivity, mm2/s 12
14
Thermal Shock Resistance, points 14
53

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.48 to 0.53
Chromium (Cr), % 0.8 to 1.3
0.8 to 1.1
Iron (Fe), % 96.8 to 98.4
96.7 to 97.7
Manganese (Mn), % 0.3 to 0.61
0.7 to 0.9
Molybdenum (Mo), % 0.44 to 0.65
0
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0.15 to 0.35
Sulfur (S), % 0 to 0.025
0 to 0.040
Vanadium (V), % 0
0.15 to 0.3