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ASTM A387 Grade 21L Class 1 vs. S21900 Stainless Steel

Both ASTM A387 grade 21L class 1 and S21900 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 67% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, 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 S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
220
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
50
Fatigue Strength, MPa 160
380
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
78
Shear Strength, MPa 310
510
Tensile Strength: Ultimate (UTS), MPa 500
710
Tensile Strength: Yield (Proof), MPa 230
390

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Maximum Temperature: Mechanical, °C 480
980
Melting Completion (Liquidus), °C 1470
1400
Melting Onset (Solidus), °C 1430
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
14
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
15
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 1.8
3.0
Embodied Energy, MJ/kg 23
43
Embodied Water, L/kg 62
160

Common Calculations

PREN (Pitting Resistance) 6.4
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84
300
Resilience: Unit (Modulus of Resilience), kJ/m3 140
380
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
26
Strength to Weight: Bending, points 18
23
Thermal Diffusivity, mm2/s 11
3.8
Thermal Shock Resistance, points 14
15

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.080
Chromium (Cr), % 2.8 to 3.3
19 to 21.5
Iron (Fe), % 94.4 to 96.1
59.4 to 67.4
Manganese (Mn), % 0.3 to 0.6
8.0 to 10
Molybdenum (Mo), % 0.9 to 1.1
0
Nickel (Ni), % 0
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0 to 0.025
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.030