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S20910 Stainless Steel vs. ASTM A387 Grade 91 Class 2

Both S20910 stainless steel and ASTM A387 grade 91 class 2 are iron alloys. They have 68% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is S20910 stainless steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230 to 290
200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 14 to 39
20
Fatigue Strength, MPa 310 to 460
330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 79
75
Shear Strength, MPa 500 to 570
420
Tensile Strength: Ultimate (UTS), MPa 780 to 940
670
Tensile Strength: Yield (Proof), MPa 430 to 810
470

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Mechanical, °C 1080
600
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 13
26
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 22
7.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.8
2.6
Embodied Energy, MJ/kg 68
37
Embodied Water, L/kg 180
88

Common Calculations

PREN (Pitting Resistance) 34
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 260
120
Resilience: Unit (Modulus of Resilience), kJ/m3 460 to 1640
580
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28 to 33
24
Strength to Weight: Bending, points 24 to 27
22
Thermal Diffusivity, mm2/s 3.6
6.9
Thermal Shock Resistance, points 17 to 21
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.060
0.080 to 0.12
Chromium (Cr), % 20.5 to 23.5
8.0 to 9.5
Iron (Fe), % 52.1 to 62.1
87.3 to 90.3
Manganese (Mn), % 4.0 to 6.0
0.3 to 0.6
Molybdenum (Mo), % 1.5 to 3.0
0.85 to 1.1
Nickel (Ni), % 11.5 to 13.5
0 to 0.4
Niobium (Nb), % 0.1 to 0.3
0.060 to 0.1
Nitrogen (N), % 0.2 to 0.4
0.030 to 0.070
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 0.75
0.2 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0.1 to 0.3
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010