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S21800 Stainless Steel vs. EN 1.6781 Steel

Both S21800 stainless steel and EN 1.6781 steel are iron alloys. They have 68% of their average alloy composition in common. There are 27 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 S21800 stainless steel and the bottom bar is EN 1.6781 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
250
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 40
17
Fatigue Strength, MPa 330
450
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Tensile Strength: Ultimate (UTS), MPa 740
830
Tensile Strength: Yield (Proof), MPa 390
680

Thermal Properties

Latent Heat of Fusion, J/g 340
260
Maximum Temperature: Mechanical, °C 900
450
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1310
1420
Specific Heat Capacity, J/kg-K 500
470
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 15
5.0
Density, g/cm3 7.5
7.9
Embodied Carbon, kg CO2/kg material 3.1
1.9
Embodied Energy, MJ/kg 45
25
Embodied Water, L/kg 150
60

Common Calculations

PREN (Pitting Resistance) 19
3.3
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
130
Resilience: Unit (Modulus of Resilience), kJ/m3 390
1220
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 27
29
Strength to Weight: Bending, points 24
25
Thermal Shock Resistance, points 17
24

Alloy Composition

Carbon (C), % 0 to 0.1
0.15 to 0.19
Chromium (Cr), % 16 to 18
1.3 to 1.8
Iron (Fe), % 59.1 to 65.4
92.6 to 94.6
Manganese (Mn), % 7.0 to 9.0
0.55 to 0.8
Molybdenum (Mo), % 0
0.45 to 0.6
Nickel (Ni), % 8.0 to 9.0
3.0 to 3.5
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.060
0 to 0.015
Silicon (Si), % 3.5 to 4.5
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.015