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EN 1.4031 Stainless Steel vs. EN 1.8550 Steel

Both EN 1.4031 stainless steel and EN 1.8550 steel are iron alloys. They have 88% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is EN 1.4031 stainless steel and the bottom bar is EN 1.8550 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 13
11
Fatigue Strength, MPa 220 to 400
470
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Shear Strength, MPa 400 to 540
600
Tensile Strength: Ultimate (UTS), MPa 670 to 900
1000
Tensile Strength: Yield (Proof), MPa 390 to 730
760

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 770
440
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1400
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 30
40
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.1
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 3.7
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
3.4
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 1.9
1.7
Embodied Energy, MJ/kg 27
23
Embodied Water, L/kg 100
67

Common Calculations

PREN (Pitting Resistance) 14
2.3
Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 94
100
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 1360
1550
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24 to 32
36
Strength to Weight: Bending, points 22 to 27
29
Thermal Diffusivity, mm2/s 8.1
11
Thermal Shock Resistance, points 23 to 32
29

Alloy Composition

Aluminum (Al), % 0
0.8 to 1.2
Carbon (C), % 0.36 to 0.42
0.3 to 0.37
Chromium (Cr), % 12.5 to 14.5
1.5 to 1.8
Iron (Fe), % 83 to 87.1
94.4 to 96.3
Manganese (Mn), % 0 to 1.0
0.4 to 0.7
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 0
0.85 to 1.2
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.015
0 to 0.035