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AISI 201L Stainless Steel vs. ASTM A387 Grade 91 Class 2

Both AISI 201L stainless steel and ASTM A387 grade 91 class 2 are iron alloys. They have 81% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is AISI 201L stainless steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 320
200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 22 to 46
20
Fatigue Strength, MPa 270 to 530
330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
75
Shear Strength, MPa 520 to 660
420
Tensile Strength: Ultimate (UTS), MPa 740 to 1040
670
Tensile Strength: Yield (Proof), MPa 290 to 790
470

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Maximum Temperature: Mechanical, °C 880
600
Melting Completion (Liquidus), °C 1410
1460
Melting Onset (Solidus), °C 1370
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
26
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
10

Otherwise Unclassified Properties

Base Metal Price, % relative 12
7.0
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.6
2.6
Embodied Energy, MJ/kg 38
37
Embodied Water, L/kg 140
88

Common Calculations

PREN (Pitting Resistance) 19
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210 to 300
120
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 1570
580
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 27 to 37
24
Strength to Weight: Bending, points 24 to 30
22
Thermal Diffusivity, mm2/s 4.0
6.9
Thermal Shock Resistance, points 16 to 23
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.030
0.080 to 0.12
Chromium (Cr), % 16 to 18
8.0 to 9.5
Iron (Fe), % 67.9 to 75
87.3 to 90.3
Manganese (Mn), % 5.5 to 7.5
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 3.5 to 5.5
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0 to 0.25
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