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SAE-AISI 4340M Steel vs. EN 1.4436 Stainless Steel

Both SAE-AISI 4340M steel and EN 1.4436 stainless steel are iron alloys. They have 71% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (3, 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 1.4436 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
42
Fatigue Strength, MPa 690
220
Impact Strength: V-Notched Charpy, J 18
90
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
78
Shear Strength, MPa 1360
430
Tensile Strength: Ultimate (UTS), MPa 2340
620
Tensile Strength: Yield (Proof), MPa 1240
240

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Mechanical, °C 430
960
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
19
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
3.9
Embodied Energy, MJ/kg 26
54
Embodied Water, L/kg 55
150

Common Calculations

PREN (Pitting Resistance) 2.2
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
210
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
150
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
22
Strength to Weight: Bending, points 51
20
Thermal Diffusivity, mm2/s 10
4.0
Thermal Shock Resistance, points 70
14

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.050
Chromium (Cr), % 0.7 to 1.0
16.5 to 18.5
Iron (Fe), % 93.3 to 94.8
62.3 to 70.5
Manganese (Mn), % 0.65 to 0.9
0 to 2.0
Molybdenum (Mo), % 0.35 to 0.45
2.5 to 3.0
Nickel (Ni), % 1.7 to 2.0
10.5 to 13
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.012
0 to 0.045
Silicon (Si), % 1.5 to 1.8
0 to 1.0
Sulfur (S), % 0 to 0.012
0 to 0.015
Vanadium (V), % 0.050 to 0.1
0