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ASTM A227 Spring Steel vs. ACI-ASTM CN7MS Steel

Both ASTM A227 spring steel and ACI-ASTM CN7MS 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 ASTM A227 spring steel and the bottom bar is ACI-ASTM CN7MS steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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