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EN 1.4903 Stainless Steel vs. EN 1.7221 Steel

Both EN 1.4903 stainless steel and EN 1.7221 steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is EN 1.4903 stainless steel and the bottom bar is EN 1.7221 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20 to 21
11 to 17
Fatigue Strength, MPa 320 to 330
290 to 390
Impact Strength: V-Notched Charpy, J 42 to 46
20 to 38
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Tensile Strength: Ultimate (UTS), MPa 670 to 680
650 to 780
Tensile Strength: Yield (Proof), MPa 500
430 to 630

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 650
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 26
44
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.4
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 4.0
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
2.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.6
1.5
Embodied Energy, MJ/kg 36
20
Embodied Water, L/kg 88
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 130
83 to 98
Resilience: Unit (Modulus of Resilience), kJ/m3 650
490 to 1050
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24
23 to 27
Strength to Weight: Bending, points 22
21 to 24
Thermal Diffusivity, mm2/s 7.0
12
Thermal Shock Resistance, points 23
19 to 23

Alloy Composition

Aluminum (Al), % 0 to 0.040
0
Carbon (C), % 0.080 to 0.12
0.22 to 0.29
Chromium (Cr), % 8.0 to 9.5
0.8 to 1.2
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 87.1 to 90.5
96.8 to 98.3
Manganese (Mn), % 0.3 to 0.6
0.5 to 0.8
Molybdenum (Mo), % 0.85 to 1.1
0.15 to 0.3
Nickel (Ni), % 0 to 0.4
0
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
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), % 0.18 to 0.25
0