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EN 1.4317 Stainless Steel vs. SAE-AISI 4320 Steel

Both EN 1.4317 stainless steel and SAE-AISI 4320 steel are iron alloys. They have 85% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is EN 1.4317 stainless steel and the bottom bar is SAE-AISI 4320 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 17
21 to 29
Fatigue Strength, MPa 380
320
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Tensile Strength: Ultimate (UTS), MPa 860
570 to 790
Tensile Strength: Yield (Proof), MPa 630
430 to 460

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 770
420
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 26
46
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.7
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.2
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 10
3.4
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.4
1.7
Embodied Energy, MJ/kg 33
22
Embodied Water, L/kg 110
52

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
140 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 1010
480 to 560
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 31
20 to 28
Strength to Weight: Bending, points 26
19 to 24
Thermal Diffusivity, mm2/s 7.0
13
Thermal Shock Resistance, points 30
19 to 27

Alloy Composition

Carbon (C), % 0 to 0.060
0.17 to 0.22
Chromium (Cr), % 12 to 13.5
0.4 to 0.6
Iron (Fe), % 78.7 to 84.5
95.8 to 97
Manganese (Mn), % 0 to 1.0
0.45 to 0.65
Molybdenum (Mo), % 0 to 0.7
0.2 to 0.3
Nickel (Ni), % 3.5 to 5.0
1.7 to 2.0
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.025
0 to 0.040