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ASTM A387 Grade 91 Class 2 vs. S32750 Stainless Steel

Both ASTM A387 grade 91 class 2 and S32750 stainless steel are iron alloys. They have 73% of their average alloy composition in common. There are 32 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 S32750 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
270
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 20
17
Fatigue Strength, MPa 330
360
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 75
81
Shear Strength, MPa 420
530
Tensile Strength: Ultimate (UTS), MPa 670
860
Tensile Strength: Yield (Proof), MPa 470
590

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Maximum Temperature: Mechanical, °C 600
1100
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 26
15
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 10
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
21
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.6
4.1
Embodied Energy, MJ/kg 37
56
Embodied Water, L/kg 88
180

Common Calculations

PREN (Pitting Resistance) 13
43
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
130
Resilience: Unit (Modulus of Resilience), kJ/m3 580
860
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
31
Strength to Weight: Bending, points 22
26
Thermal Diffusivity, mm2/s 6.9
4.0
Thermal Shock Resistance, points 19
25

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
0 to 0.030
Chromium (Cr), % 8.0 to 9.5
24 to 26
Copper (Cu), % 0
0 to 0.5
Iron (Fe), % 87.3 to 90.3
58.1 to 66.8
Manganese (Mn), % 0.3 to 0.6
0 to 1.2
Molybdenum (Mo), % 0.85 to 1.1
3.0 to 5.0
Nickel (Ni), % 0 to 0.4
6.0 to 8.0
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0.24 to 0.32
Phosphorus (P), % 0 to 0.020
0 to 0.035
Silicon (Si), % 0.2 to 0.5
0 to 0.8
Sulfur (S), % 0 to 0.010
0 to 0.020
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0
Zirconium (Zr), % 0 to 0.010
0