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ASTM A228 Music Wire vs. Grade N7M Nickel

ASTM A228 music wire belongs to the iron alloys classification, while grade N7M nickel belongs to the nickel alloys. There are 24 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is ASTM A228 music wire and the bottom bar is grade N7M nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 12
22
Fatigue Strength, MPa 1280
190
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 72
85
Tensile Strength: Ultimate (UTS), MPa 2450
590
Tensile Strength: Yield (Proof), MPa 2050
310

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Maximum Temperature: Mechanical, °C 400
900
Melting Completion (Liquidus), °C 1450
1650
Melting Onset (Solidus), °C 1410
1590
Specific Heat Capacity, J/kg-K 470
390
Thermal Expansion, µm/m-K 12
9.9

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
75
Density, g/cm3 7.8
9.3
Embodied Carbon, kg CO2/kg material 1.4
16
Embodied Energy, MJ/kg 19
200
Embodied Water, L/kg 45
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 280
110
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 87
18
Strength to Weight: Bending, points 52
17
Thermal Shock Resistance, points 79
19

Alloy Composition

Carbon (C), % 0.7 to 1.0
0 to 0.070
Chromium (Cr), % 0
0 to 1.0
Iron (Fe), % 98 to 99
0 to 3.0
Manganese (Mn), % 0.2 to 0.6
0 to 1.0
Molybdenum (Mo), % 0
30 to 33
Nickel (Ni), % 0
60.9 to 70
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0.1 to 0.3
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030