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ASTM A387 Grade 21L Class 1 vs. EN 1.4021 Stainless Steel

Both ASTM A387 grade 21L class 1 and EN 1.4021 stainless steel are iron alloys. They have 89% of their average alloy composition in common. There are 31 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 EN 1.4021 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
11 to 17
Fatigue Strength, MPa 160
240 to 380
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
76
Shear Strength, MPa 310
390 to 530
Tensile Strength: Ultimate (UTS), MPa 500
630 to 880
Tensile Strength: Yield (Proof), MPa 230
390 to 670

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Maximum Temperature: Mechanical, °C 480
760
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1430
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
30
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
7.0
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 1.8
1.9
Embodied Energy, MJ/kg 23
27
Embodied Water, L/kg 62
100

Common Calculations

PREN (Pitting Resistance) 6.4
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84
88 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 140
400 to 1160
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
23 to 31
Strength to Weight: Bending, points 18
21 to 26
Thermal Diffusivity, mm2/s 11
8.1
Thermal Shock Resistance, points 14
22 to 31

Alloy Composition

Carbon (C), % 0 to 0.1
0.16 to 0.25
Chromium (Cr), % 2.8 to 3.3
12 to 14
Iron (Fe), % 94.4 to 96.1
83.2 to 87.8
Manganese (Mn), % 0.3 to 0.6
0 to 1.5
Molybdenum (Mo), % 0.9 to 1.1
0
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.015