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SAE-AISI 8625 Steel vs. EN 1.4634 Stainless Steel

Both SAE-AISI 8625 steel and EN 1.4634 stainless steel are iron alloys. Both are furnished in the annealed condition. 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 (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8625 steel and the bottom bar is EN 1.4634 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 25
21
Fatigue Strength, MPa 240
180
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 330
340
Tensile Strength: Ultimate (UTS), MPa 510
540
Tensile Strength: Yield (Proof), MPa 330
280

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 410
900
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 39
21
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
13
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.5
2.9
Embodied Energy, MJ/kg 20
42
Embodied Water, L/kg 50
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
93
Resilience: Unit (Modulus of Resilience), kJ/m3 300
200
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
20
Strength to Weight: Bending, points 18
19
Thermal Diffusivity, mm2/s 10
5.8
Thermal Shock Resistance, points 17
19

Alloy Composition

Aluminum (Al), % 0
0.2 to 1.5
Carbon (C), % 0.23 to 0.28
0 to 0.030
Chromium (Cr), % 0.4 to 0.6
17.5 to 18.5
Copper (Cu), % 0
0 to 0.5
Iron (Fe), % 96.8 to 98
74.9 to 81.8
Manganese (Mn), % 0.7 to 0.9
0 to 1.0
Molybdenum (Mo), % 0.15 to 0.25
0 to 0.5
Nickel (Ni), % 0.4 to 0.7
0 to 0.5
Niobium (Nb), % 0
0.3 to 1.0
Phosphorus (P), % 0 to 0.035
0 to 0.050
Silicon (Si), % 0.15 to 0.35
0.2 to 1.5
Sulfur (S), % 0 to 0.040
0 to 0.050