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S17400 Stainless Steel vs. SAE-AISI 4718 Steel

Both S17400 stainless steel and SAE-AISI 4718 steel are iron alloys. They have 77% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is S17400 stainless steel and the bottom bar is SAE-AISI 4718 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280 to 440
150
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 21
24
Fatigue Strength, MPa 380 to 670
270
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
73
Shear Strength, MPa 570 to 830
330
Tensile Strength: Ultimate (UTS), MPa 910 to 1390
510
Tensile Strength: Yield (Proof), MPa 580 to 1250
370

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 850
420
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 17
39
Thermal Expansion, µm/m-K 11
11

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 14
3.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.7
1.6
Embodied Energy, MJ/kg 39
21
Embodied Water, L/kg 130
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 160
110
Resilience: Unit (Modulus of Resilience), kJ/m3 880 to 4060
360
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 32 to 49
18
Strength to Weight: Bending, points 27 to 35
18
Thermal Diffusivity, mm2/s 4.5
10
Thermal Shock Resistance, points 30 to 46
17

Alloy Composition

Carbon (C), % 0 to 0.070
0.16 to 0.21
Chromium (Cr), % 15 to 17
0.35 to 0.55
Copper (Cu), % 3.0 to 5.0
0
Iron (Fe), % 70.4 to 78.9
96.3 to 97.4
Manganese (Mn), % 0 to 1.0
0.7 to 0.9
Molybdenum (Mo), % 0
0.3 to 0.4
Nickel (Ni), % 3.0 to 5.0
0.9 to 1.2
Niobium (Nb), % 0.15 to 0.45
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040