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SAE-AISI 8645 Steel vs. EN 1.4423 Stainless Steel

Both SAE-AISI 8645 steel and EN 1.4423 stainless steel are iron alloys. They have 80% of their average alloy composition in common. There are 30 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 SAE-AISI 8645 steel and the bottom bar is EN 1.4423 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 23
17
Fatigue Strength, MPa 280 to 350
380
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 380 to 400
520
Tensile Strength: Ultimate (UTS), MPa 600 to 670
850
Tensile Strength: Yield (Proof), MPa 390 to 560
630

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 410
780
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 39
16
Thermal Expansion, µm/m-K 13
9.9

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
14
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.5
3.2
Embodied Energy, MJ/kg 20
43
Embodied Water, L/kg 50
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
130
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
1000
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21 to 24
30
Strength to Weight: Bending, points 20 to 22
25
Thermal Diffusivity, mm2/s 10
4.3
Thermal Shock Resistance, points 18 to 20
31

Alloy Composition

Carbon (C), % 0.43 to 0.48
0 to 0.020
Chromium (Cr), % 0.4 to 0.6
11 to 13
Copper (Cu), % 0
0.2 to 0.8
Iron (Fe), % 96.5 to 97.7
73.8 to 80.5
Manganese (Mn), % 0.75 to 1.0
0 to 2.0
Molybdenum (Mo), % 0.15 to 0.25
2.3 to 2.8
Nickel (Ni), % 0.4 to 0.7
6.0 to 7.0
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.0030