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SAE-AISI 4340 Steel vs. EN 1.4658 Stainless Steel

Both SAE-AISI 4340 steel and EN 1.4658 stainless 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 SAE-AISI 4340 steel and the bottom bar is EN 1.4658 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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