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EN 1.4971 Stainless Steel vs. EN 1.8550 Steel

Both EN 1.4971 stainless steel and EN 1.8550 steel are iron alloys. They have a modest 34% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is EN 1.4971 stainless steel and the bottom bar is EN 1.8550 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
300
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
11
Fatigue Strength, MPa 270
470
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
73
Shear Strength, MPa 530
600
Tensile Strength: Ultimate (UTS), MPa 800
1000
Tensile Strength: Yield (Proof), MPa 340
760

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
440
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
40
Thermal Expansion, µm/m-K 15
13

Otherwise Unclassified Properties

Base Metal Price, % relative 70
3.4
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 7.6
1.7
Embodied Energy, MJ/kg 110
23
Embodied Water, L/kg 300
67

Common Calculations

PREN (Pitting Resistance) 38
2.3
Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
100
Resilience: Unit (Modulus of Resilience), kJ/m3 280
1550
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26
36
Strength to Weight: Bending, points 23
29
Thermal Diffusivity, mm2/s 3.4
11
Thermal Shock Resistance, points 19
29

Alloy Composition

Aluminum (Al), % 0
0.8 to 1.2
Carbon (C), % 0.080 to 0.16
0.3 to 0.37
Chromium (Cr), % 20 to 22.5
1.5 to 1.8
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 37.1
94.4 to 96.3
Manganese (Mn), % 0 to 2.0
0.4 to 0.7
Molybdenum (Mo), % 2.5 to 3.5
0.15 to 0.25
Nickel (Ni), % 19 to 21
0.85 to 1.2
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0.1 to 0.2
0
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.015
0 to 0.035
Tungsten (W), % 2.0 to 3.0
0