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ACI-ASTM CK35MN Steel vs. ASTM A227 Spring Steel

Both ACI-ASTM CK35MN steel and ASTM A227 spring steel are iron alloys. They have 49% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CK35MN steel and the bottom bar is ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
500 to 640
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 40
12
Fatigue Strength, MPa 270
900 to 1160
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 81
72
Tensile Strength: Ultimate (UTS), MPa 650
1720 to 2220
Tensile Strength: Yield (Proof), MPa 310
1430 to 1850

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 470
470
Thermal Conductivity, W/m-K 12
52
Thermal Expansion, µm/m-K 16
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 31
1.8
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 5.9
1.4
Embodied Energy, MJ/kg 81
19
Embodied Water, L/kg 210
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
200 to 260
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 22
61 to 79
Strength to Weight: Bending, points 21
41 to 48
Thermal Diffusivity, mm2/s 3.3
14
Thermal Shock Resistance, points 14
55 to 71

Alloy Composition

Carbon (C), % 0 to 0.035
0.45 to 0.85
Chromium (Cr), % 22 to 24
0
Copper (Cu), % 0 to 0.4
0
Iron (Fe), % 43.4 to 51.8
97.4 to 99.1
Manganese (Mn), % 0 to 2.0
0.3 to 1.3
Molybdenum (Mo), % 6.0 to 6.8
0
Nickel (Ni), % 20 to 22
0
Nitrogen (N), % 0.21 to 0.32
0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.050