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ASTM A227 Spring Steel vs. ASTM A369 Grade FP12

Both ASTM A227 spring steel and ASTM A369 grade FP12 are iron alloys. They have a very high 98% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is ASTM A227 spring steel and the bottom bar is ASTM A369 grade FP12.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 500 to 640
140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12
20
Fatigue Strength, MPa 900 to 1160
170
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 1030 to 1330
300
Tensile Strength: Ultimate (UTS), MPa 1720 to 2220
470
Tensile Strength: Yield (Proof), MPa 1430 to 1850
250

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
430
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1410
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 52
45
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
2.8
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.4
1.6
Embodied Energy, MJ/kg 19
21
Embodied Water, L/kg 46
52

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 260
81
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 61 to 79
17
Strength to Weight: Bending, points 41 to 48
17
Thermal Diffusivity, mm2/s 14
12
Thermal Shock Resistance, points 55 to 71
14

Alloy Composition

Carbon (C), % 0.45 to 0.85
0.050 to 0.15
Chromium (Cr), % 0
0.8 to 1.3
Iron (Fe), % 97.4 to 99.1
96.8 to 98.4
Manganese (Mn), % 0.3 to 1.3
0.3 to 0.61
Molybdenum (Mo), % 0
0.44 to 0.65
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0 to 0.5
Sulfur (S), % 0 to 0.050
0 to 0.025