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EN 1.4911 Stainless Steel vs. EN 1.6781 Steel

Both EN 1.4911 stainless steel and EN 1.6781 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have 84% of their average alloy composition in common. There are 30 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 1.4911 stainless steel and the bottom bar is EN 1.6781 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 11
17
Fatigue Strength, MPa 530
450
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Tensile Strength: Ultimate (UTS), MPa 1070
830
Tensile Strength: Yield (Proof), MPa 970
680

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Maximum Temperature: Mechanical, °C 700
450
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 20
44
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.7
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 20
5.0
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 3.4
1.9
Embodied Energy, MJ/kg 49
25
Embodied Water, L/kg 130
60

Common Calculations

PREN (Pitting Resistance) 14
3.3
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
130
Resilience: Unit (Modulus of Resilience), kJ/m3 2410
1220
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 38
29
Strength to Weight: Bending, points 30
25
Thermal Diffusivity, mm2/s 5.4
12
Thermal Shock Resistance, points 37
24

Alloy Composition

Boron (B), % 0.0050 to 0.015
0
Carbon (C), % 0.050 to 0.12
0.15 to 0.19
Chromium (Cr), % 9.8 to 11.2
1.3 to 1.8
Cobalt (Co), % 5.0 to 7.0
0
Iron (Fe), % 75.7 to 83.8
92.6 to 94.6
Manganese (Mn), % 0.3 to 1.3
0.55 to 0.8
Molybdenum (Mo), % 0.5 to 1.0
0.45 to 0.6
Nickel (Ni), % 0.2 to 1.2
3.0 to 3.5
Niobium (Nb), % 0.2 to 0.5
0
Nitrogen (N), % 0 to 0.035
0
Phosphorus (P), % 0 to 0.025
0 to 0.015
Silicon (Si), % 0.1 to 0.8
0 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.015
Tungsten (W), % 0 to 0.7
0
Vanadium (V), % 0.1 to 0.4
0