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EN 1.7779 Steel vs. AISI 309Cb Stainless Steel

Both EN 1.7779 steel and AISI 309Cb stainless steel are iron alloys. They have 65% 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 309Cb stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 240
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 16
39
Fatigue Strength, MPa 430
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
78
Shear Strength, MPa 500
390
Tensile Strength: Ultimate (UTS), MPa 810
580
Tensile Strength: Yield (Proof), MPa 660
230

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Maximum Temperature: Mechanical, °C 470
1090
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
23
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.8
4.1
Embodied Energy, MJ/kg 41
59
Embodied Water, L/kg 64
170

Common Calculations

PREN (Pitting Resistance) 5.0
23
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
180
Resilience: Unit (Modulus of Resilience), kJ/m3 1150
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 29
20
Strength to Weight: Bending, points 25
20
Thermal Diffusivity, mm2/s 11
4.0
Thermal Shock Resistance, points 23
13

Alloy Composition

Aluminum (Al), % 0 to 0.040
0
Carbon (C), % 0.17 to 0.23
0 to 0.080
Chromium (Cr), % 3.0 to 3.3
22 to 24
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 93.8 to 95.4
56 to 66
Manganese (Mn), % 0.3 to 0.5
0 to 2.0
Molybdenum (Mo), % 0.5 to 0.6
0
Nickel (Ni), % 0 to 0.3
12 to 16
Niobium (Nb), % 0
0 to 1.1
Phosphorus (P), % 0 to 0.025
0 to 0.045
Silicon (Si), % 0.15 to 0.35
0 to 0.75
Sulfur (S), % 0 to 0.010
0 to 0.030
Vanadium (V), % 0.45 to 0.55
0