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SAE-AISI 4340M Steel vs. EN 1.4911 Stainless Steel

Both SAE-AISI 4340M steel and EN 1.4911 stainless steel are iron alloys. They have 83% 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 SAE-AISI 4340M steel and the bottom bar is EN 1.4911 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
11
Fatigue Strength, MPa 690
530
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
76
Shear Strength, MPa 1360
640
Tensile Strength: Ultimate (UTS), MPa 2340
1070
Tensile Strength: Yield (Proof), MPa 1240
970

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Maximum Temperature: Mechanical, °C 430
700
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1400
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
20
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
20
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
3.4
Embodied Energy, MJ/kg 26
49
Embodied Water, L/kg 55
130

Common Calculations

PREN (Pitting Resistance) 2.2
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
120
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
2410
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
38
Strength to Weight: Bending, points 51
30
Thermal Diffusivity, mm2/s 10
5.4
Thermal Shock Resistance, points 70
37

Alloy Composition

Boron (B), % 0
0.0050 to 0.015
Carbon (C), % 0.38 to 0.43
0.050 to 0.12
Chromium (Cr), % 0.7 to 1.0
9.8 to 11.2
Cobalt (Co), % 0
5.0 to 7.0
Iron (Fe), % 93.3 to 94.8
75.7 to 83.8
Manganese (Mn), % 0.65 to 0.9
0.3 to 1.3
Molybdenum (Mo), % 0.35 to 0.45
0.5 to 1.0
Nickel (Ni), % 1.7 to 2.0
0.2 to 1.2
Niobium (Nb), % 0
0.2 to 0.5
Nitrogen (N), % 0
0 to 0.035
Phosphorus (P), % 0 to 0.012
0 to 0.025
Silicon (Si), % 1.5 to 1.8
0.1 to 0.8
Sulfur (S), % 0 to 0.012
0 to 0.015
Tungsten (W), % 0
0 to 0.7
Vanadium (V), % 0.050 to 0.1
0.1 to 0.4