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AISI 201L Stainless Steel vs. ASTM A387 Grade 21 Steel

Both AISI 201L stainless steel and ASTM A387 grade 21 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 (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 21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 320
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 22 to 46
21
Fatigue Strength, MPa 270 to 530
160 to 250
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
74
Shear Strength, MPa 520 to 660
310 to 370
Tensile Strength: Ultimate (UTS), MPa 740 to 1040
500 to 590
Tensile Strength: Yield (Proof), MPa 290 to 790
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Maximum Temperature: Mechanical, °C 880
480
Melting Completion (Liquidus), °C 1410
1470
Melting Onset (Solidus), °C 1370
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
41
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 12
4.1
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 2.6
1.8
Embodied Energy, MJ/kg 38
23
Embodied Water, L/kg 140
62

Common Calculations

PREN (Pitting Resistance) 19
6.4
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210 to 300
84 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 220 to 1570
140 to 320
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 27 to 37
18 to 21
Strength to Weight: Bending, points 24 to 30
18 to 20
Thermal Diffusivity, mm2/s 4.0
11
Thermal Shock Resistance, points 16 to 23
14 to 17

Alloy Composition

Carbon (C), % 0 to 0.030
0.050 to 0.15
Chromium (Cr), % 16 to 18
2.8 to 3.3
Iron (Fe), % 67.9 to 75
94.4 to 96
Manganese (Mn), % 5.5 to 7.5
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 3.5 to 5.5
0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.045
0 to 0.025
Silicon (Si), % 0 to 0.75
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025

Comparable Variants