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S31277 Stainless Steel vs. ASTM A387 Grade 91 Class 2

Both S31277 stainless steel and ASTM A387 grade 91 class 2 are iron alloys. They have 52% 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 S31277 stainless steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 45
20
Fatigue Strength, MPa 380
330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 80
75
Shear Strength, MPa 600
420
Tensile Strength: Ultimate (UTS), MPa 860
670
Tensile Strength: Yield (Proof), MPa 410
470

Thermal Properties

Latent Heat of Fusion, J/g 310
270
Maximum Temperature: Mechanical, °C 1100
600
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 460
470
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 36
7.0
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 6.7
2.6
Embodied Energy, MJ/kg 90
37
Embodied Water, L/kg 220
88

Common Calculations

PREN (Pitting Resistance) 51
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 320
120
Resilience: Unit (Modulus of Resilience), kJ/m3 410
580
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29
24
Strength to Weight: Bending, points 25
22
Thermal Shock Resistance, points 19
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.020
0.080 to 0.12
Chromium (Cr), % 20.5 to 23
8.0 to 9.5
Copper (Cu), % 0.5 to 1.5
0
Iron (Fe), % 35.5 to 46.2
87.3 to 90.3
Manganese (Mn), % 0 to 3.0
0.3 to 0.6
Molybdenum (Mo), % 6.5 to 8.0
0.85 to 1.1
Nickel (Ni), % 26 to 28
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0.3 to 0.4
0.030 to 0.070
Phosphorus (P), % 0 to 0.030
0 to 0.020
Silicon (Si), % 0 to 0.5
0.2 to 0.5
Sulfur (S), % 0 to 0.010
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