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EN 1.7221 Steel vs. AISI 304 Stainless Steel

Both EN 1.7221 steel and AISI 304 stainless 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 EN 1.7221 steel and the bottom bar is AISI 304 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 230
170 to 360
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 17
8.0 to 43
Fatigue Strength, MPa 290 to 390
210 to 440
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 650 to 780
580 to 1180
Tensile Strength: Yield (Proof), MPa 430 to 630
230 to 860

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 420
710
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
16
Thermal Expansion, µm/m-K 13
17

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
15
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
3.0
Embodied Energy, MJ/kg 20
43
Embodied Water, L/kg 51
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 98
86 to 250
Resilience: Unit (Modulus of Resilience), kJ/m3 490 to 1050
140 to 1870
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23 to 27
21 to 42
Strength to Weight: Bending, points 21 to 24
20 to 32
Thermal Diffusivity, mm2/s 12
4.2
Thermal Shock Resistance, points 19 to 23
12 to 25

Alloy Composition

Carbon (C), % 0.22 to 0.29
0 to 0.080
Chromium (Cr), % 0.8 to 1.2
18 to 20
Iron (Fe), % 96.8 to 98.3
66.5 to 74
Manganese (Mn), % 0.5 to 0.8
0 to 2.0
Molybdenum (Mo), % 0.15 to 0.3
0
Nickel (Ni), % 0
8.0 to 10.5
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.025
0 to 0.045
Silicon (Si), % 0 to 0.6
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030

Comparable Variants