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EN 1.6781 Steel vs. AISI 439 Stainless Steel

Both EN 1.6781 steel and AISI 439 stainless steel are iron alloys. They have 83% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (5, 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 439 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
160
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 17
23
Fatigue Strength, MPa 450
170
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Tensile Strength: Ultimate (UTS), MPa 830
490
Tensile Strength: Yield (Proof), MPa 680
250

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Maximum Temperature: Mechanical, °C 450
890
Melting Completion (Liquidus), °C 1460
1510
Melting Onset (Solidus), °C 1420
1430
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
25
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
9.0
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 1.9
2.3
Embodied Energy, MJ/kg 25
34
Embodied Water, L/kg 60
120

Common Calculations

PREN (Pitting Resistance) 3.3
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
95
Resilience: Unit (Modulus of Resilience), kJ/m3 1220
160
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29
18
Strength to Weight: Bending, points 25
18
Thermal Diffusivity, mm2/s 12
6.7
Thermal Shock Resistance, points 24
16

Alloy Composition

Aluminum (Al), % 0
0 to 0.15
Carbon (C), % 0.15 to 0.19
0 to 0.030
Chromium (Cr), % 1.3 to 1.8
17 to 19
Iron (Fe), % 92.6 to 94.6
77.1 to 82.8
Manganese (Mn), % 0.55 to 0.8
0 to 1.0
Molybdenum (Mo), % 0.45 to 0.6
0
Nickel (Ni), % 3.0 to 3.5
0 to 0.5
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Titanium (Ti), % 0
0.2 to 1.1