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EN 1.4958 Stainless Steel vs. SAE-AISI 4340 Steel

Both EN 1.4958 stainless steel and SAE-AISI 4340 steel are iron alloys. They have 50% 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 1.4958 stainless steel and the bottom bar is SAE-AISI 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 40
12 to 22
Fatigue Strength, MPa 170
330 to 740
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 430
430 to 770
Tensile Strength: Ultimate (UTS), MPa 630
690 to 1280
Tensile Strength: Yield (Proof), MPa 190
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1090
430
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1350
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 12
44
Thermal Expansion, µm/m-K 15
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 30
3.5
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 5.3
1.7
Embodied Energy, MJ/kg 75
22
Embodied Water, L/kg 200
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 95
590 to 3490
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 22
24 to 45
Strength to Weight: Bending, points 20
22 to 33
Thermal Diffusivity, mm2/s 3.2
12
Thermal Shock Resistance, points 15
20 to 38

Alloy Composition

Aluminum (Al), % 0.2 to 0.5
0
Carbon (C), % 0.030 to 0.080
0.38 to 0.43
Chromium (Cr), % 19 to 22
0.7 to 0.9
Cobalt (Co), % 0 to 0.5
0
Copper (Cu), % 0 to 0.5
0
Iron (Fe), % 41.1 to 50.6
95.1 to 96.3
Manganese (Mn), % 0 to 1.5
0.6 to 0.8
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 30 to 32.5
1.7 to 2.0
Niobium (Nb), % 0 to 0.1
0
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.015
0 to 0.035
Silicon (Si), % 0 to 0.7
0.15 to 0.35
Sulfur (S), % 0 to 0.010
0 to 0.040
Titanium (Ti), % 0.2 to 0.5
0