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EN 1.4901 Stainless Steel vs. SAE-AISI 8645 Steel

Both EN 1.4901 stainless steel and SAE-AISI 8645 steel are iron alloys. They have 89% 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 EN 1.4901 stainless steel and the bottom bar is SAE-AISI 8645 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 19
12 to 23
Fatigue Strength, MPa 310
280 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Shear Strength, MPa 460
380 to 400
Tensile Strength: Ultimate (UTS), MPa 740
600 to 670
Tensile Strength: Yield (Proof), MPa 490
390 to 560

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Maximum Temperature: Mechanical, °C 650
410
Melting Completion (Liquidus), °C 1490
1460
Melting Onset (Solidus), °C 1450
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 26
39
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.2
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 9.3
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 11
2.6
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.8
1.5
Embodied Energy, MJ/kg 40
20
Embodied Water, L/kg 89
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
77 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 620
420 to 840
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26
21 to 24
Strength to Weight: Bending, points 23
20 to 22
Thermal Diffusivity, mm2/s 6.9
10
Thermal Shock Resistance, points 23
18 to 20

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Boron (B), % 0.0010 to 0.0060
0
Carbon (C), % 0.070 to 0.13
0.43 to 0.48
Chromium (Cr), % 8.5 to 9.5
0.4 to 0.6
Iron (Fe), % 85.8 to 89.1
96.5 to 97.7
Manganese (Mn), % 0.3 to 0.6
0.75 to 1.0
Molybdenum (Mo), % 0.3 to 0.6
0.15 to 0.25
Nickel (Ni), % 0 to 0.4
0.4 to 0.7
Niobium (Nb), % 0.040 to 0.090
0
Nitrogen (N), % 0.030 to 0.070
0
Phosphorus (P), % 0 to 0.020
0 to 0.035
Silicon (Si), % 0 to 0.5
0.15 to 0.35
Sulfur (S), % 0 to 0.010
0 to 0.040
Titanium (Ti), % 0 to 0.010
0
Tungsten (W), % 1.5 to 2.0
0
Vanadium (V), % 0.15 to 0.25
0
Zirconium (Zr), % 0 to 0.010
0