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SAE-AISI P20 Steel vs. ASTM A387 Grade 91 Class 2

Both SAE-AISI P20 steel and ASTM A387 grade 91 class 2 are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 24 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 SAE-AISI P20 steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Tensile Strength: Ultimate (UTS), MPa 540 to 1050
670

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 45
26
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
10

Otherwise Unclassified Properties

Base Metal Price, % relative 2.8
7.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.6
2.6
Embodied Energy, MJ/kg 21
37
Embodied Water, L/kg 52
88

Common Calculations

PREN (Pitting Resistance) 2.6
13
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19 to 37
24
Strength to Weight: Bending, points 19 to 29
22
Thermal Diffusivity, mm2/s 12
6.9
Thermal Shock Resistance, points 18 to 35
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0.28 to 0.4
0.080 to 0.12
Chromium (Cr), % 0.4 to 2.0
8.0 to 9.5
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 95.2 to 98.5
87.3 to 90.3
Manganese (Mn), % 0.35 to 0.71
0.3 to 0.6
Molybdenum (Mo), % 0.3 to 0.55
0.85 to 1.1
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.030
0 to 0.020
Silicon (Si), % 0.2 to 0.8
0.2 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010