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EN 1.7779 Steel vs. EN 1.4008 Stainless Steel

Both EN 1.7779 steel and EN 1.4008 stainless steel are iron alloys. Both are furnished in the quenched and tempered condition. They have 89% 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 1.7779 steel and the bottom bar is EN 1.4008 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 16
17
Fatigue Strength, MPa 430
300
Impact Strength: V-Notched Charpy, J 38
31
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 810
670
Tensile Strength: Yield (Proof), MPa 660
500

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Maximum Temperature: Mechanical, °C 470
760
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
25
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.7
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
8.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.8
2.1
Embodied Energy, MJ/kg 41
30
Embodied Water, L/kg 64
100

Common Calculations

PREN (Pitting Resistance) 5.0
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
100
Resilience: Unit (Modulus of Resilience), kJ/m3 1150
630
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29
24
Strength to Weight: Bending, points 25
22
Thermal Diffusivity, mm2/s 11
6.7
Thermal Shock Resistance, points 23
23

Alloy Composition

Aluminum (Al), % 0 to 0.040
0
Carbon (C), % 0.17 to 0.23
0 to 0.1
Chromium (Cr), % 3.0 to 3.3
12 to 13.5
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 93.8 to 95.4
81.8 to 86.8
Manganese (Mn), % 0.3 to 0.5
0 to 1.0
Molybdenum (Mo), % 0.5 to 0.6
0.2 to 0.5
Nickel (Ni), % 0 to 0.3
1.0 to 2.0
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.025
Vanadium (V), % 0.45 to 0.55
0