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EN 1.4594 Stainless Steel vs. SAE-AISI 8645 Steel

Both EN 1.4594 stainless steel and SAE-AISI 8645 steel are iron alloys. They have 78% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is EN 1.4594 stainless steel and the bottom bar is SAE-AISI 8645 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 11 to 17
12 to 23
Fatigue Strength, MPa 490 to 620
280 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Shear Strength, MPa 620 to 700
380 to 400
Tensile Strength: Ultimate (UTS), MPa 1020 to 1170
600 to 670
Tensile Strength: Yield (Proof), MPa 810 to 1140
390 to 560

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 820
410
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 16
39
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 15
2.6
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 3.2
1.5
Embodied Energy, MJ/kg 45
20
Embodied Water, L/kg 130
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 190
77 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 1660 to 3320
420 to 840
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 36 to 41
21 to 24
Strength to Weight: Bending, points 29 to 31
20 to 22
Thermal Diffusivity, mm2/s 4.4
10
Thermal Shock Resistance, points 34 to 39
18 to 20

Alloy Composition

Carbon (C), % 0 to 0.070
0.43 to 0.48
Chromium (Cr), % 13 to 15
0.4 to 0.6
Copper (Cu), % 1.2 to 2.0
0
Iron (Fe), % 72.6 to 79.5
96.5 to 97.7
Manganese (Mn), % 0 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 1.2 to 2.0
0.15 to 0.25
Nickel (Ni), % 5.0 to 6.0
0.4 to 0.7
Niobium (Nb), % 0.15 to 0.6
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 0.7
0.15 to 0.35
Sulfur (S), % 0 to 0.015
0 to 0.040