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S44725 Stainless Steel vs. EN 1.7221 Steel

Both S44725 stainless steel and EN 1.7221 steel are iron alloys. They have 72% of their average alloy composition in common. There are 30 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 S44725 stainless steel and the bottom bar is EN 1.7221 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
200 to 230
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 22
11 to 17
Fatigue Strength, MPa 210
290 to 390
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 81
73
Tensile Strength: Ultimate (UTS), MPa 500
650 to 780
Tensile Strength: Yield (Proof), MPa 310
430 to 630

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 1100
420
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 17
44
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 15
2.4
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.1
1.5
Embodied Energy, MJ/kg 44
20
Embodied Water, L/kg 170
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 99
83 to 98
Resilience: Unit (Modulus of Resilience), kJ/m3 240
490 to 1050
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18
23 to 27
Strength to Weight: Bending, points 18
21 to 24
Thermal Diffusivity, mm2/s 4.6
12
Thermal Shock Resistance, points 16
19 to 23

Alloy Composition

Carbon (C), % 0 to 0.015
0.22 to 0.29
Chromium (Cr), % 25 to 28.5
0.8 to 1.2
Iron (Fe), % 67.6 to 73.5
96.8 to 98.3
Manganese (Mn), % 0 to 0.4
0.5 to 0.8
Molybdenum (Mo), % 1.5 to 2.5
0.15 to 0.3
Nickel (Ni), % 0 to 0.3
0
Niobium (Nb), % 0 to 0.26
0
Nitrogen (N), % 0 to 0.018
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 0.040
0 to 0.6
Sulfur (S), % 0 to 0.020
0 to 0.030
Titanium (Ti), % 0 to 0.26
0