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ASTM A387 Grade 21 Steel vs. EN 1.4938 Stainless Steel

Both ASTM A387 grade 21 steel and EN 1.4938 stainless steel are iron alloys. They have 88% 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 21 steel and the bottom bar is EN 1.4938 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
16 to 17
Fatigue Strength, MPa 160 to 250
390 to 520
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
76
Shear Strength, MPa 310 to 370
540 to 630
Tensile Strength: Ultimate (UTS), MPa 500 to 590
870 to 1030
Tensile Strength: Yield (Proof), MPa 230 to 350
640 to 870

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Maximum Temperature: Mechanical, °C 480
750
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 470
470
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
10
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
3.3
Embodied Energy, MJ/kg 23
47
Embodied Water, L/kg 62
110

Common Calculations

PREN (Pitting Resistance) 6.4
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
140 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
1050 to 1920
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18 to 21
31 to 37
Strength to Weight: Bending, points 18 to 20
26 to 29
Thermal Diffusivity, mm2/s 11
8.1
Thermal Shock Resistance, points 14 to 17
30 to 35

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.080 to 0.15
Chromium (Cr), % 2.8 to 3.3
11 to 12.5
Iron (Fe), % 94.4 to 96
80.5 to 84.8
Manganese (Mn), % 0.3 to 0.6
0.4 to 0.9
Molybdenum (Mo), % 0.9 to 1.1
1.5 to 2.0
Nickel (Ni), % 0
2.0 to 3.0
Nitrogen (N), % 0
0.020 to 0.040
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.025
0 to 0.015
Vanadium (V), % 0
0.25 to 0.4

Comparable Variants