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SAE-AISI 4340M Steel vs. EN 1.4150 Stainless Steel

Both SAE-AISI 4340M steel and EN 1.4150 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 85% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is EN 1.4150 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
220
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
20
Fatigue Strength, MPa 690
270
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
76
Shear Strength, MPa 1360
460
Tensile Strength: Ultimate (UTS), MPa 2340
730
Tensile Strength: Yield (Proof), MPa 1240
430

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Mechanical, °C 430
840
Melting Completion (Liquidus), °C 1440
1420
Melting Onset (Solidus), °C 1400
1380
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 38
23
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
8.5
Density, g/cm3 7.8
7.6
Embodied Carbon, kg CO2/kg material 1.9
2.8
Embodied Energy, MJ/kg 26
42
Embodied Water, L/kg 55
120

Common Calculations

PREN (Pitting Resistance) 2.2
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
120
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
470
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
27
Strength to Weight: Bending, points 51
24
Thermal Diffusivity, mm2/s 10
6.2
Thermal Shock Resistance, points 70
27

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.45 to 0.6
Chromium (Cr), % 0.7 to 1.0
15 to 16.5
Iron (Fe), % 93.3 to 94.8
79 to 82.8
Manganese (Mn), % 0.65 to 0.9
0 to 0.8
Molybdenum (Mo), % 0.35 to 0.45
0.2 to 0.4
Nickel (Ni), % 1.7 to 2.0
0 to 0.4
Nitrogen (N), % 0
0.050 to 0.2
Phosphorus (P), % 0 to 0.012
0 to 0.030
Silicon (Si), % 1.5 to 1.8
1.3 to 1.7
Sulfur (S), % 0 to 0.012
0 to 0.010
Vanadium (V), % 0.050 to 0.1
0.2 to 0.4