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ASTM A387 Grade 91 Class 2 vs. S66286 Stainless Steel

Both ASTM A387 grade 91 class 2 and S66286 stainless steel are iron alloys. They have 65% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, 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 S66286 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
17 to 40
Fatigue Strength, MPa 330
240 to 410
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
75
Shear Strength, MPa 420
420 to 630
Tensile Strength: Ultimate (UTS), MPa 670
620 to 1020
Tensile Strength: Yield (Proof), MPa 470
280 to 670

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Maximum Temperature: Mechanical, °C 600
920
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 26
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 10
2.2

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
26
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.6
6.0
Embodied Energy, MJ/kg 37
87
Embodied Water, L/kg 88
170

Common Calculations

PREN (Pitting Resistance) 13
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
150 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 580
190 to 1150
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24
22 to 36
Strength to Weight: Bending, points 22
20 to 28
Thermal Diffusivity, mm2/s 6.9
4.0
Thermal Shock Resistance, points 19
13 to 22

Alloy Composition

Aluminum (Al), % 0 to 0.020
0 to 0.35
Boron (B), % 0
0.0010 to 0.010
Carbon (C), % 0.080 to 0.12
0 to 0.080
Chromium (Cr), % 8.0 to 9.5
13.5 to 16
Iron (Fe), % 87.3 to 90.3
49.1 to 59.5
Manganese (Mn), % 0.3 to 0.6
0 to 2.0
Molybdenum (Mo), % 0.85 to 1.1
1.0 to 1.5
Nickel (Ni), % 0 to 0.4
24 to 27
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0.2 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 0 to 0.010
1.9 to 2.4
Vanadium (V), % 0.18 to 0.25
0.1 to 0.5
Zirconium (Zr), % 0 to 0.010
0