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EN 1.7779 Steel vs. S31254 Stainless Steel

Both EN 1.7779 steel and S31254 stainless steel are iron alloys. They have 59% of their average alloy composition in common. There are 32 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 1.7779 steel and the bottom bar is S31254 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 16
40
Fatigue Strength, MPa 430
290
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
80
Shear Strength, MPa 500
490
Tensile Strength: Ultimate (UTS), MPa 810
720
Tensile Strength: Yield (Proof), MPa 660
330

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Maximum Temperature: Mechanical, °C 470
1090
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
460
Thermal Conductivity, W/m-K 39
14
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.7
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
28
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 2.8
5.5
Embodied Energy, MJ/kg 41
74
Embodied Water, L/kg 64
190

Common Calculations

PREN (Pitting Resistance) 5.0
44
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
240
Resilience: Unit (Modulus of Resilience), kJ/m3 1150
270
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
25
Strength to Weight: Bending, points 25
22
Thermal Diffusivity, mm2/s 11
3.8
Thermal Shock Resistance, points 23
15

Alloy Composition

Aluminum (Al), % 0 to 0.040
0
Carbon (C), % 0.17 to 0.23
0 to 0.020
Chromium (Cr), % 3.0 to 3.3
19.5 to 20.5
Copper (Cu), % 0 to 0.3
0.5 to 1.0
Iron (Fe), % 93.8 to 95.4
51.4 to 56.3
Manganese (Mn), % 0.3 to 0.5
0 to 1.0
Molybdenum (Mo), % 0.5 to 0.6
6.0 to 6.5
Nickel (Ni), % 0 to 0.3
17.5 to 18.5
Nitrogen (N), % 0
0.18 to 0.22
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0.15 to 0.35
0 to 0.8
Sulfur (S), % 0 to 0.010
0 to 0.010
Vanadium (V), % 0.45 to 0.55
0