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EN 1.4938 Stainless Steel vs. EN 1.7221 Steel

Both EN 1.4938 stainless steel and EN 1.7221 steel are iron alloys. They have 85% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is EN 1.4938 stainless steel and the bottom bar is EN 1.7221 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 16 to 17
11 to 17
Fatigue Strength, MPa 390 to 520
290 to 390
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Tensile Strength: Ultimate (UTS), MPa 870 to 1030
650 to 780
Tensile Strength: Yield (Proof), MPa 640 to 870
430 to 630

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 750
420
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 30
44
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 10
2.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.3
1.5
Embodied Energy, MJ/kg 47
20
Embodied Water, L/kg 110
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 160
83 to 98
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1920
490 to 1050
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 31 to 37
23 to 27
Strength to Weight: Bending, points 26 to 29
21 to 24
Thermal Diffusivity, mm2/s 8.1
12
Thermal Shock Resistance, points 30 to 35
19 to 23

Alloy Composition

Carbon (C), % 0.080 to 0.15
0.22 to 0.29
Chromium (Cr), % 11 to 12.5
0.8 to 1.2
Iron (Fe), % 80.5 to 84.8
96.8 to 98.3
Manganese (Mn), % 0.4 to 0.9
0.5 to 0.8
Molybdenum (Mo), % 1.5 to 2.0
0.15 to 0.3
Nickel (Ni), % 2.0 to 3.0
0
Nitrogen (N), % 0.020 to 0.040
0
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.6
Sulfur (S), % 0 to 0.015
0 to 0.030
Vanadium (V), % 0.25 to 0.4
0