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ASTM A387 Grade 21 Steel vs. EN 1.4903 Stainless Steel

Both ASTM A387 grade 21 steel and EN 1.4903 stainless steel are iron alloys. They have a moderately high 94% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, 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 1.4903 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21
20 to 21
Fatigue Strength, MPa 160 to 250
320 to 330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
75
Shear Strength, MPa 310 to 370
420
Tensile Strength: Ultimate (UTS), MPa 500 to 590
670 to 680
Tensile Strength: Yield (Proof), MPa 230 to 350
500

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Maximum Temperature: Mechanical, °C 480
650
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
26
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
3.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
4.0

Otherwise Unclassified Properties

Base Metal Price, % relative 4.1
7.0
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.8
2.6
Embodied Energy, MJ/kg 23
36
Embodied Water, L/kg 62
88

Common Calculations

PREN (Pitting Resistance) 6.4
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
120 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
650
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18 to 21
24
Strength to Weight: Bending, points 18 to 20
22
Thermal Diffusivity, mm2/s 11
7.0
Thermal Shock Resistance, points 14 to 17
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.040
Carbon (C), % 0.050 to 0.15
0.080 to 0.12
Chromium (Cr), % 2.8 to 3.3
8.0 to 9.5
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 94.4 to 96
87.1 to 90.5
Manganese (Mn), % 0.3 to 0.6
0.3 to 0.6
Molybdenum (Mo), % 0.9 to 1.1
0.85 to 1.1
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
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
0.18 to 0.25

Comparable Variants