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EN 1.7779 Steel vs. AISI 422 Stainless Steel

Both EN 1.7779 steel and AISI 422 stainless steel are iron alloys. They have 89% 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 AISI 422 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
260 to 330
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 16
15 to 17
Fatigue Strength, MPa 430
410 to 500
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Shear Strength, MPa 500
560 to 660
Tensile Strength: Ultimate (UTS), MPa 810
910 to 1080
Tensile Strength: Yield (Proof), MPa 660
670 to 870

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Maximum Temperature: Mechanical, °C 470
650
Melting Completion (Liquidus), °C 1460
1480
Melting Onset (Solidus), °C 1420
1470
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
24
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.7
4.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
5.3

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
11
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.8
3.1
Embodied Energy, MJ/kg 41
44
Embodied Water, L/kg 64
100

Common Calculations

PREN (Pitting Resistance) 5.0
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
140 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 1150
1140 to 1910
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29
32 to 38
Strength to Weight: Bending, points 25
26 to 30
Thermal Diffusivity, mm2/s 11
6.4
Thermal Shock Resistance, points 23
33 to 39

Alloy Composition

Aluminum (Al), % 0 to 0.040
0
Carbon (C), % 0.17 to 0.23
0.2 to 0.25
Chromium (Cr), % 3.0 to 3.3
11 to 12.5
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 93.8 to 95.4
81.9 to 85.8
Manganese (Mn), % 0.3 to 0.5
0.5 to 1.0
Molybdenum (Mo), % 0.5 to 0.6
0.9 to 1.3
Nickel (Ni), % 0 to 0.3
0.5 to 1.0
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0 to 0.5
Sulfur (S), % 0 to 0.010
0 to 0.025
Tungsten (W), % 0
0.9 to 1.3
Vanadium (V), % 0.45 to 0.55
0.2 to 0.3