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EN 1.8550 Steel vs. S21800 Stainless Steel

Both EN 1.8550 steel and S21800 stainless steel are iron alloys. They have 66% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is EN 1.8550 steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 300
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
40
Fatigue Strength, MPa 470
330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Shear Strength, MPa 600
510
Tensile Strength: Ultimate (UTS), MPa 1000
740
Tensile Strength: Yield (Proof), MPa 760
390

Thermal Properties

Latent Heat of Fusion, J/g 250
340
Maximum Temperature: Mechanical, °C 440
900
Melting Completion (Liquidus), °C 1450
1360
Melting Onset (Solidus), °C 1410
1310
Specific Heat Capacity, J/kg-K 480
500
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
15
Density, g/cm3 7.8
7.5
Embodied Carbon, kg CO2/kg material 1.7
3.1
Embodied Energy, MJ/kg 23
45
Embodied Water, L/kg 67
150

Common Calculations

PREN (Pitting Resistance) 2.3
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
250
Resilience: Unit (Modulus of Resilience), kJ/m3 1550
390
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
26
Strength to Weight: Axial, points 36
27
Strength to Weight: Bending, points 29
24
Thermal Shock Resistance, points 29
17

Alloy Composition

Aluminum (Al), % 0.8 to 1.2
0
Carbon (C), % 0.3 to 0.37
0 to 0.1
Chromium (Cr), % 1.5 to 1.8
16 to 18
Iron (Fe), % 94.4 to 96.3
59.1 to 65.4
Manganese (Mn), % 0.4 to 0.7
7.0 to 9.0
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.85 to 1.2
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.025
0 to 0.060
Silicon (Si), % 0 to 0.4
3.5 to 4.5
Sulfur (S), % 0 to 0.035
0 to 0.030