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ACI-ASTM CN7MS Steel vs. ASTM A227 Spring Steel

Both ACI-ASTM CN7MS steel and ASTM A227 spring steel are iron alloys. They have 50% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CN7MS steel and the bottom bar is ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
500 to 640
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 39
12
Fatigue Strength, MPa 200
900 to 1160
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Tensile Strength: Ultimate (UTS), MPa 540
1720 to 2220
Tensile Strength: Yield (Proof), MPa 230
1430 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 340
250
Maximum Temperature: Mechanical, °C 1040
400
Melting Completion (Liquidus), °C 1400
1450
Melting Onset (Solidus), °C 1350
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 12
52
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Base Metal Price, % relative 28
1.8
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 5.1
1.4
Embodied Energy, MJ/kg 71
19
Embodied Water, L/kg 180
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
200 to 260
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
61 to 79
Strength to Weight: Bending, points 19
41 to 48
Thermal Diffusivity, mm2/s 3.2
14
Thermal Shock Resistance, points 13
55 to 71

Alloy Composition

Carbon (C), % 0 to 0.070
0.45 to 0.85
Chromium (Cr), % 18 to 20
0
Copper (Cu), % 1.5 to 2.0
0
Iron (Fe), % 45.4 to 53.5
97.4 to 99.1
Manganese (Mn), % 0 to 1.0
0.3 to 1.3
Molybdenum (Mo), % 2.5 to 3.0
0
Nickel (Ni), % 22 to 25
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 2.5 to 3.5
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.050