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EN 1.4658 Stainless Steel vs. SAE-AISI 4340 Steel

Both EN 1.4658 stainless steel and SAE-AISI 4340 steel are iron alloys. They have 61% of their average alloy composition in common. There are 29 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 EN 1.4658 stainless steel and the bottom bar is SAE-AISI 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 260
210 to 360
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 28
12 to 22
Fatigue Strength, MPa 530
330 to 740
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 81
73
Shear Strength, MPa 580
430 to 770
Tensile Strength: Ultimate (UTS), MPa 900
690 to 1280
Tensile Strength: Yield (Proof), MPa 730
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
430
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 16
44
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Base Metal Price, % relative 25
3.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.5
1.7
Embodied Energy, MJ/kg 61
22
Embodied Water, L/kg 200
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 1280
590 to 3490
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 32
24 to 45
Strength to Weight: Bending, points 26
22 to 33
Thermal Diffusivity, mm2/s 4.3
12
Thermal Shock Resistance, points 24
20 to 38

Alloy Composition

Carbon (C), % 0 to 0.030
0.38 to 0.43
Chromium (Cr), % 26 to 29
0.7 to 0.9
Cobalt (Co), % 0.5 to 2.0
0
Copper (Cu), % 0 to 1.0
0
Iron (Fe), % 50.9 to 63.7
95.1 to 96.3
Manganese (Mn), % 0 to 1.5
0.6 to 0.8
Molybdenum (Mo), % 4.0 to 5.0
0.2 to 0.3
Nickel (Ni), % 5.5 to 9.5
1.7 to 2.0
Nitrogen (N), % 0.3 to 0.5
0
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0 to 0.5
0.15 to 0.35
Sulfur (S), % 0 to 0.010
0 to 0.040