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EN 1.4306 Stainless Steel vs. EN 1.7221 Steel

Both EN 1.4306 stainless steel and EN 1.7221 steel are iron alloys. They have 70% 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 1.4306 stainless steel and the bottom bar is EN 1.7221 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 270
200 to 230
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 14 to 45
11 to 17
Fatigue Strength, MPa 190 to 330
290 to 390
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 580 to 900
650 to 780
Tensile Strength: Yield (Proof), MPa 210 to 570
430 to 630

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 960
420
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
44
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 16
2.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.2
1.5
Embodied Energy, MJ/kg 45
20
Embodied Water, L/kg 150
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 200
83 to 98
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 820
490 to 1050
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21 to 32
23 to 27
Strength to Weight: Bending, points 20 to 27
21 to 24
Thermal Diffusivity, mm2/s 4.0
12
Thermal Shock Resistance, points 13 to 20
19 to 23

Alloy Composition

Carbon (C), % 0 to 0.030
0.22 to 0.29
Chromium (Cr), % 18 to 20
0.8 to 1.2
Iron (Fe), % 64.8 to 72
96.8 to 98.3
Manganese (Mn), % 0 to 2.0
0.5 to 0.8
Molybdenum (Mo), % 0
0.15 to 0.3
Nickel (Ni), % 10 to 12
0
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.6
Sulfur (S), % 0 to 0.015
0 to 0.030

Comparable Variants