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EN 1.8550 Steel vs. EN 1.4317 Stainless Steel

Both EN 1.8550 steel and EN 1.4317 stainless steel are iron alloys. Both are furnished in the quenched and tempered condition. They have 85% 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 1.8550 steel and the bottom bar is EN 1.4317 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11
17
Fatigue Strength, MPa 470
380
Impact Strength: V-Notched Charpy, J 34
56
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 1000
860
Tensile Strength: Yield (Proof), MPa 760
630

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 440
770
Melting Completion (Liquidus), °C 1450
1440
Melting Onset (Solidus), °C 1410
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 40
26
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
3.2

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
10
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
2.4
Embodied Energy, MJ/kg 23
33
Embodied Water, L/kg 67
110

Common Calculations

PREN (Pitting Resistance) 2.3
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
130
Resilience: Unit (Modulus of Resilience), kJ/m3 1550
1010
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 36
31
Strength to Weight: Bending, points 29
26
Thermal Diffusivity, mm2/s 11
7.0
Thermal Shock Resistance, points 29
30

Alloy Composition

Aluminum (Al), % 0.8 to 1.2
0
Carbon (C), % 0.3 to 0.37
0 to 0.060
Chromium (Cr), % 1.5 to 1.8
12 to 13.5
Iron (Fe), % 94.4 to 96.3
78.7 to 84.5
Manganese (Mn), % 0.4 to 0.7
0 to 1.0
Molybdenum (Mo), % 0.15 to 0.25
0 to 0.7
Nickel (Ni), % 0.85 to 1.2
3.5 to 5.0
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.035
0 to 0.025