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ACI-ASTM CN3MN Steel vs. ASTM A229 Spring Steel

Both ACI-ASTM CN3MN steel and ASTM A229 spring steel are iron alloys. They have 47% 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 ACI-ASTM CN3MN steel and the bottom bar is ASTM A229 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
490 to 550
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 39
14
Fatigue Strength, MPa 250
710 to 790
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 80
72
Tensile Strength: Ultimate (UTS), MPa 620
1690 to 1890
Tensile Strength: Yield (Proof), MPa 300
1100 to 1230

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Maximum Temperature: Mechanical, °C 1100
400
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 460
470
Thermal Conductivity, W/m-K 13
50
Thermal Expansion, µm/m-K 16
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 33
1.8
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 6.2
1.4
Embodied Energy, MJ/kg 84
19
Embodied Water, L/kg 200
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 210
3260 to 4080
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21
60 to 67
Strength to Weight: Bending, points 20
40 to 43
Thermal Diffusivity, mm2/s 3.4
14
Thermal Shock Resistance, points 14
54 to 60

Alloy Composition

Carbon (C), % 0 to 0.030
0.55 to 0.85
Chromium (Cr), % 20 to 22
0
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 41.4 to 50.3
97.5 to 99
Manganese (Mn), % 0 to 2.0
0.3 to 1.2
Molybdenum (Mo), % 6.0 to 7.0
0
Nickel (Ni), % 23.5 to 25.5
0
Nitrogen (N), % 0.18 to 0.26
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.010
0 to 0.050