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ASTM A387 Grade 91 Class 2 vs. S30815 Stainless Steel

Both ASTM A387 grade 91 class 2 and S30815 stainless steel are iron alloys. They have 75% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, 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 S30815 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20
45
Fatigue Strength, MPa 330
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
77
Shear Strength, MPa 420
480
Tensile Strength: Ultimate (UTS), MPa 670
680
Tensile Strength: Yield (Proof), MPa 470
350

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Maximum Temperature: Mechanical, °C 600
1020
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1420
1360
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 26
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 10
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
17
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.6
3.3
Embodied Energy, MJ/kg 37
47
Embodied Water, L/kg 88
160

Common Calculations

PREN (Pitting Resistance) 13
24
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
260
Resilience: Unit (Modulus of Resilience), kJ/m3 580
310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
25
Strength to Weight: Bending, points 22
22
Thermal Diffusivity, mm2/s 6.9
4.0
Thermal Shock Resistance, points 19
15

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
0.050 to 0.1
Cerium (Ce), % 0
0.030 to 0.080
Chromium (Cr), % 8.0 to 9.5
20 to 22
Iron (Fe), % 87.3 to 90.3
62.8 to 68.4
Manganese (Mn), % 0.3 to 0.6
0 to 0.8
Molybdenum (Mo), % 0.85 to 1.1
0
Nickel (Ni), % 0 to 0.4
10 to 12
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0.14 to 0.2
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0.2 to 0.5
1.4 to 2.0
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