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S21603 Stainless Steel vs. ASTM A387 Grade 91 Class 2

Both S21603 stainless steel and ASTM A387 grade 91 class 2 are iron alloys. They have 74% 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 S21603 stainless steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 45
20
Fatigue Strength, MPa 360
330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 79
75
Shear Strength, MPa 490
420
Tensile Strength: Ultimate (UTS), MPa 690
670
Tensile Strength: Yield (Proof), MPa 390
470

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Maximum Temperature: Mechanical, °C 990
600
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 17
13

Otherwise Unclassified Properties

Base Metal Price, % relative 17
7.0
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.6
2.6
Embodied Energy, MJ/kg 50
37
Embodied Water, L/kg 160
88

Common Calculations

PREN (Pitting Resistance) 34
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 270
120
Resilience: Unit (Modulus of Resilience), kJ/m3 380
580
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25
24
Strength to Weight: Bending, points 22
22
Thermal Shock Resistance, points 15
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.030
0.080 to 0.12
Chromium (Cr), % 17.5 to 22
8.0 to 9.5
Iron (Fe), % 57.6 to 67.8
87.3 to 90.3
Manganese (Mn), % 7.5 to 9.0
0.3 to 0.6
Molybdenum (Mo), % 2.0 to 3.0
0.85 to 1.1
Nickel (Ni), % 5.0 to 7.0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0.25 to 0.5
0.030 to 0.070
Phosphorus (P), % 0 to 0.045
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
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010