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ASTM A231 Spring Steel vs. ACI-ASTM CF3MN Steel

Both ASTM A231 spring steel and ACI-ASTM CF3MN steel are iron alloys. They have 67% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is ASTM A231 spring steel and the bottom bar is ACI-ASTM CF3MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 540
170
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 14
39
Fatigue Strength, MPa 1000
250
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Tensile Strength: Ultimate (UTS), MPa 1790
580
Tensile Strength: Yield (Proof), MPa 1570
290

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 420
1010
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1410
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 52
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.0
3.9
Embodied Energy, MJ/kg 28
53
Embodied Water, L/kg 51
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
190
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 64
20
Strength to Weight: Bending, points 42
20
Thermal Diffusivity, mm2/s 14
4.1
Thermal Shock Resistance, points 53
13

Alloy Composition

Carbon (C), % 0.48 to 0.53
0 to 0.030
Chromium (Cr), % 0.8 to 1.1
17 to 22
Iron (Fe), % 96.7 to 97.7
58.7 to 71.9
Manganese (Mn), % 0.7 to 0.9
0 to 1.5
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0
9.0 to 13
Nitrogen (N), % 0
0.1 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.5
Sulfur (S), % 0 to 0.040
0 to 0.040
Vanadium (V), % 0.15 to 0.3
0