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EN 1.6781 Steel vs. AISI 309S Stainless Steel

Both EN 1.6781 steel and AISI 309S stainless steel are iron alloys. They have 68% of their average alloy composition in common. There are 31 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 1.6781 steel and the bottom bar is AISI 309S stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 17
42
Fatigue Strength, MPa 450
210
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
78
Tensile Strength: Ultimate (UTS), MPa 830
580
Tensile Strength: Yield (Proof), MPa 680
230

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Maximum Temperature: Mechanical, °C 450
1080
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
19
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.9
3.6
Embodied Energy, MJ/kg 25
51
Embodied Water, L/kg 60
170

Common Calculations

PREN (Pitting Resistance) 3.3
23
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
190
Resilience: Unit (Modulus of Resilience), kJ/m3 1220
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29
21
Strength to Weight: Bending, points 25
20
Thermal Diffusivity, mm2/s 12
4.0
Thermal Shock Resistance, points 24
13

Alloy Composition

Carbon (C), % 0.15 to 0.19
0 to 0.080
Chromium (Cr), % 1.3 to 1.8
22 to 24
Iron (Fe), % 92.6 to 94.6
58.1 to 66
Manganese (Mn), % 0.55 to 0.8
0 to 2.0
Molybdenum (Mo), % 0.45 to 0.6
0
Nickel (Ni), % 3.0 to 3.5
12 to 15
Phosphorus (P), % 0 to 0.015
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 0.75
Sulfur (S), % 0 to 0.015
0 to 0.030