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EN 1.4021 Stainless Steel vs. SAE-AISI 4718 Steel

Both EN 1.4021 stainless steel and SAE-AISI 4718 steel are iron alloys. They have 87% 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 1.4021 stainless steel and the bottom bar is SAE-AISI 4718 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 17
24
Fatigue Strength, MPa 240 to 380
270
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Shear Strength, MPa 390 to 530
330
Tensile Strength: Ultimate (UTS), MPa 630 to 880
510
Tensile Strength: Yield (Proof), MPa 390 to 670
370

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 760
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 30
39
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
3.0
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 1.9
1.6
Embodied Energy, MJ/kg 27
21
Embodied Water, L/kg 100
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 88 to 110
110
Resilience: Unit (Modulus of Resilience), kJ/m3 400 to 1160
360
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 23 to 31
18
Strength to Weight: Bending, points 21 to 26
18
Thermal Diffusivity, mm2/s 8.1
10
Thermal Shock Resistance, points 22 to 31
17

Alloy Composition

Carbon (C), % 0.16 to 0.25
0.16 to 0.21
Chromium (Cr), % 12 to 14
0.35 to 0.55
Iron (Fe), % 83.2 to 87.8
96.3 to 97.4
Manganese (Mn), % 0 to 1.5
0.7 to 0.9
Molybdenum (Mo), % 0
0.3 to 0.4
Nickel (Ni), % 0
0.9 to 1.2
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 0.015
0 to 0.040