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EN 1.4558 Stainless Steel vs. SAE-AISI 4340M Steel

Both EN 1.4558 stainless steel and SAE-AISI 4340M steel are iron alloys. They have 47% 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 EN 1.4558 stainless steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 39
6.0
Fatigue Strength, MPa 170
690
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Shear Strength, MPa 350
1360
Tensile Strength: Ultimate (UTS), MPa 510
2340
Tensile Strength: Yield (Proof), MPa 200
1240

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Mechanical, °C 1100
430
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1350
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 12
38
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 31
3.9
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 5.5
1.9
Embodied Energy, MJ/kg 77
26
Embodied Water, L/kg 200
55

Common Calculations

PREN (Pitting Resistance) 22
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
120
Resilience: Unit (Modulus of Resilience), kJ/m3 100
4120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
84
Strength to Weight: Bending, points 18
51
Thermal Diffusivity, mm2/s 3.1
10
Thermal Shock Resistance, points 12
70

Alloy Composition

Aluminum (Al), % 0.15 to 0.45
0
Carbon (C), % 0 to 0.030
0.38 to 0.43
Chromium (Cr), % 20 to 23
0.7 to 1.0
Iron (Fe), % 39.2 to 47.9
93.3 to 94.8
Manganese (Mn), % 0 to 1.0
0.65 to 0.9
Molybdenum (Mo), % 0
0.35 to 0.45
Nickel (Ni), % 32 to 35
1.7 to 2.0
Phosphorus (P), % 0 to 0.020
0 to 0.012
Silicon (Si), % 0 to 0.7
1.5 to 1.8
Sulfur (S), % 0 to 0.015
0 to 0.012
Titanium (Ti), % 0 to 0.6
0
Vanadium (V), % 0
0.050 to 0.1