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EN 1.4640 Stainless Steel vs. SAE-AISI 8640 Steel

Both EN 1.4640 stainless steel and SAE-AISI 8640 steel are iron alloys. They have 73% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is EN 1.4640 stainless steel and the bottom bar is SAE-AISI 8640 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 200
170
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 51
23
Fatigue Strength, MPa 230 to 250
270
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 440 to 460
360
Tensile Strength: Ultimate (UTS), MPa 620 to 650
570
Tensile Strength: Yield (Proof), MPa 240 to 260
380

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 930
410
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
39
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 14
2.6
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.8
1.5
Embodied Energy, MJ/kg 40
20
Embodied Water, L/kg 150
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 250 to 260
120
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 170
380
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 22 to 23
20
Strength to Weight: Bending, points 21
20
Thermal Diffusivity, mm2/s 4.0
10
Thermal Shock Resistance, points 14 to 15
17

Alloy Composition

Carbon (C), % 0.030 to 0.080
0.38 to 0.43
Chromium (Cr), % 18 to 19
0.4 to 0.6
Copper (Cu), % 1.3 to 2.0
0
Iron (Fe), % 67.4 to 73.6
96.6 to 97.8
Manganese (Mn), % 1.5 to 4.0
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 5.5 to 6.9
0.4 to 0.7
Nitrogen (N), % 0.030 to 0.11
0
Phosphorus (P), % 0 to 0.045
0 to 0.035
Silicon (Si), % 0 to 0.5
0.15 to 0.35
Sulfur (S), % 0 to 0.015
0 to 0.040