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EN 1.3551 Steel vs. S81921 Stainless Steel

Both EN 1.3551 steel and S81921 stainless steel are iron alloys. They have 77% of their average alloy composition in common. There are 26 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 1.3551 steel and the bottom bar is S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
260
Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 75
79
Tensile Strength: Ultimate (UTS), MPa 720
710

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Maximum Temperature: Mechanical, °C 530
990
Melting Completion (Liquidus), °C 1490
1430
Melting Onset (Solidus), °C 1450
1390
Specific Heat Capacity, J/kg-K 460
480
Thermal Conductivity, W/m-K 36
15
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.6
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.9
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
14
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 4.9
2.9
Embodied Energy, MJ/kg 71
41
Embodied Water, L/kg 82
150

Common Calculations

PREN (Pitting Resistance) 18
28
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26
25
Strength to Weight: Bending, points 23
23
Thermal Diffusivity, mm2/s 9.8
4.0
Thermal Shock Resistance, points 21
20

Alloy Composition

Carbon (C), % 0.77 to 0.85
0 to 0.030
Chromium (Cr), % 3.9 to 4.3
19 to 22
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 88.8 to 91.1
66.7 to 75.9
Manganese (Mn), % 0.15 to 0.35
2.0 to 4.0
Molybdenum (Mo), % 4.0 to 4.5
1.0 to 2.0
Nickel (Ni), % 0
2.0 to 4.0
Nitrogen (N), % 0
0.14 to 0.2
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Tungsten (W), % 0 to 0.25
0
Vanadium (V), % 0.9 to 1.1
0