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EN 1.7221 Steel vs. S17700 Stainless Steel

Both EN 1.7221 steel and S17700 stainless steel are iron alloys. They have 76% 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 S17700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 230
180 to 430
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 17
1.0 to 23
Fatigue Strength, MPa 290 to 390
290 to 560
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 650 to 780
1180 to 1650
Tensile Strength: Yield (Proof), MPa 430 to 630
430 to 1210

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 420
890
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
15
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
13
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.5
2.8
Embodied Energy, MJ/kg 20
40
Embodied Water, L/kg 51
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 98
15 to 210
Resilience: Unit (Modulus of Resilience), kJ/m3 490 to 1050
460 to 3750
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23 to 27
42 to 59
Strength to Weight: Bending, points 21 to 24
32 to 40
Thermal Diffusivity, mm2/s 12
4.1
Thermal Shock Resistance, points 19 to 23
39 to 54

Alloy Composition

Aluminum (Al), % 0
0.75 to 1.5
Carbon (C), % 0.22 to 0.29
0 to 0.090
Chromium (Cr), % 0.8 to 1.2
16 to 18
Iron (Fe), % 96.8 to 98.3
70.5 to 76.8
Manganese (Mn), % 0.5 to 0.8
0 to 1.0
Molybdenum (Mo), % 0.15 to 0.3
0
Nickel (Ni), % 0
6.5 to 7.8
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.6
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030

Comparable Variants