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EN 1.4411 Stainless Steel vs. EN 1.7779 Steel

Both EN 1.4411 stainless steel and EN 1.7779 steel are iron alloys. Both are furnished in the quenched and tempered condition. They have 81% of their average alloy composition in common. There are 31 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 1.4411 stainless steel and the bottom bar is EN 1.7779 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
16
Fatigue Strength, MPa 370
430
Impact Strength: V-Notched Charpy, J 68
38
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Tensile Strength: Ultimate (UTS), MPa 870
810
Tensile Strength: Yield (Proof), MPa 600
660

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Maximum Temperature: Mechanical, °C 880
470
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 17
39
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 13
4.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.0
2.8
Embodied Energy, MJ/kg 41
41
Embodied Water, L/kg 130
64

Common Calculations

PREN (Pitting Resistance) 22
5.0
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
120
Resilience: Unit (Modulus of Resilience), kJ/m3 920
1150
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 31
29
Strength to Weight: Bending, points 26
25
Thermal Diffusivity, mm2/s 4.6
11
Thermal Shock Resistance, points 28
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.040
Carbon (C), % 0 to 0.060
0.17 to 0.23
Chromium (Cr), % 15 to 17
3.0 to 3.3
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 73.1 to 79.5
93.8 to 95.4
Manganese (Mn), % 0 to 1.0
0.3 to 0.5
Molybdenum (Mo), % 1.5 to 2.0
0.5 to 0.6
Nickel (Ni), % 4.0 to 6.0
0 to 0.3
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0 to 0.8
0.15 to 0.35
Sulfur (S), % 0 to 0.025
0 to 0.010
Vanadium (V), % 0
0.45 to 0.55