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ASTM A387 Grade 21L Class 1 vs. AISI 201 Stainless Steel

Both ASTM A387 grade 21L class 1 and AISI 201 stainless 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 ASTM A387 grade 21L class 1 and the bottom bar is AISI 201 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
200 to 440
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
4.6 to 51
Fatigue Strength, MPa 160
280 to 600
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
77
Shear Strength, MPa 310
450 to 840
Tensile Strength: Ultimate (UTS), MPa 500
650 to 1450
Tensile Strength: Yield (Proof), MPa 230
300 to 1080

Thermal Properties

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

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
2.9

Otherwise Unclassified Properties

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

Common Calculations

PREN (Pitting Resistance) 6.4
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84
61 to 340
Resilience: Unit (Modulus of Resilience), kJ/m3 140
230 to 2970
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
23 to 52
Strength to Weight: Bending, points 18
22 to 37
Thermal Diffusivity, mm2/s 11
4.0
Thermal Shock Resistance, points 14
14 to 32

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.15
Chromium (Cr), % 2.8 to 3.3
16 to 18
Iron (Fe), % 94.4 to 96.1
67.5 to 75
Manganese (Mn), % 0.3 to 0.6
5.5 to 7.5
Molybdenum (Mo), % 0.9 to 1.1
0
Nickel (Ni), % 0
3.5 to 5.5
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.025
0 to 0.060
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.030