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S21800 Stainless Steel vs. ASTM A387 Grade 91 Class 2

Both S21800 stainless steel and ASTM A387 grade 91 class 2 are iron alloys. They have 72% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 40
20
Fatigue Strength, MPa 330
330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
75
Shear Strength, MPa 510
420
Tensile Strength: Ultimate (UTS), MPa 740
670
Tensile Strength: Yield (Proof), MPa 390
470

Thermal Properties

Latent Heat of Fusion, J/g 340
270
Maximum Temperature: Mechanical, °C 900
600
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1310
1420
Specific Heat Capacity, J/kg-K 500
470
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 15
7.0
Density, g/cm3 7.5
7.8
Embodied Carbon, kg CO2/kg material 3.1
2.6
Embodied Energy, MJ/kg 45
37
Embodied Water, L/kg 150
88

Common Calculations

PREN (Pitting Resistance) 19
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
120
Resilience: Unit (Modulus of Resilience), kJ/m3 390
580
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
24
Strength to Weight: Bending, points 24
22
Thermal Shock Resistance, points 17
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.1
0.080 to 0.12
Chromium (Cr), % 16 to 18
8.0 to 9.5
Iron (Fe), % 59.1 to 65.4
87.3 to 90.3
Manganese (Mn), % 7.0 to 9.0
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 8.0 to 9.0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0.080 to 0.18
0.030 to 0.070
Phosphorus (P), % 0 to 0.060
0 to 0.020
Silicon (Si), % 3.5 to 4.5
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
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010