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EN 1.4938 Stainless Steel vs. EN 1.6781 Steel

Both EN 1.4938 stainless steel and EN 1.6781 steel are iron alloys. They have 88% 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 1.4938 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, % 16 to 17
17
Fatigue Strength, MPa 390 to 520
450
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Tensile Strength: Ultimate (UTS), MPa 870 to 1030
830
Tensile Strength: Yield (Proof), MPa 640 to 870
680

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Maximum Temperature: Mechanical, °C 750
450
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 30
44
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 10
5.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.3
1.9
Embodied Energy, MJ/kg 47
25
Embodied Water, L/kg 110
60

Common Calculations

PREN (Pitting Resistance) 18
3.3
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 160
130
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1920
1220
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 31 to 37
29
Strength to Weight: Bending, points 26 to 29
25
Thermal Diffusivity, mm2/s 8.1
12
Thermal Shock Resistance, points 30 to 35
24

Alloy Composition

Carbon (C), % 0.080 to 0.15
0.15 to 0.19
Chromium (Cr), % 11 to 12.5
1.3 to 1.8
Iron (Fe), % 80.5 to 84.8
92.6 to 94.6
Manganese (Mn), % 0.4 to 0.9
0.55 to 0.8
Molybdenum (Mo), % 1.5 to 2.0
0.45 to 0.6
Nickel (Ni), % 2.0 to 3.0
3.0 to 3.5
Nitrogen (N), % 0.020 to 0.040
0
Phosphorus (P), % 0 to 0.025
0 to 0.015
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.015
Vanadium (V), % 0.25 to 0.4
0