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ASTM A387 Grade 91 Class 2 vs. Type 1 Magnetic Alloy

Both ASTM A387 grade 91 class 2 and Type 1 magnetic alloy are iron alloys. They have 55% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 91 class 2 and the bottom bar is Type 1 magnetic alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
4.0 to 38
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 75
72
Tensile Strength: Ultimate (UTS), MPa 670
500 to 830
Tensile Strength: Yield (Proof), MPa 470
220 to 790

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 470
460
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
3.1
Electrical Conductivity: Equal Weight (Specific), % IACS 10
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
31
Density, g/cm3 7.8
8.3
Embodied Carbon, kg CO2/kg material 2.6
5.6
Embodied Energy, MJ/kg 37
77
Embodied Water, L/kg 88
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
33 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 580
130 to 1690
Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 24
17 to 28
Strength to Weight: Bending, points 22
17 to 24
Thermal Shock Resistance, points 19
16 to 26

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
0 to 0.050
Chromium (Cr), % 8.0 to 9.5
0 to 0.3
Cobalt (Co), % 0
0 to 0.5
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 87.3 to 90.3
50.7 to 56.5
Manganese (Mn), % 0.3 to 0.6
0 to 0.8
Molybdenum (Mo), % 0.85 to 1.1
0 to 0.3
Nickel (Ni), % 0 to 0.4
43.5 to 46.5
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0
Phosphorus (P), % 0 to 0.020
0 to 0.010
Silicon (Si), % 0.2 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0
Zirconium (Zr), % 0 to 0.010
0