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EN 1.3956 Stainless Steel vs. SAE-AISI 4340 Steel

Both EN 1.3956 stainless steel and SAE-AISI 4340 steel are iron alloys. They have 61% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is EN 1.3956 stainless steel and the bottom bar is SAE-AISI 4340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 27
12 to 22
Fatigue Strength, MPa 240
330 to 740
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 79
73
Tensile Strength: Ultimate (UTS), MPa 650
690 to 1280
Tensile Strength: Yield (Proof), MPa 330
470 to 1150

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1080
430
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Base Metal Price, % relative 22
3.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.8
1.7
Embodied Energy, MJ/kg 68
22
Embodied Water, L/kg 180
53

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
79 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 270
590 to 3490
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 23
24 to 45
Strength to Weight: Bending, points 21
22 to 33
Thermal Shock Resistance, points 18
20 to 38

Alloy Composition

Carbon (C), % 0 to 0.060
0.38 to 0.43
Chromium (Cr), % 20.5 to 23.5
0.7 to 0.9
Iron (Fe), % 51.9 to 62.1
95.1 to 96.3
Manganese (Mn), % 4.0 to 6.0
0.6 to 0.8
Molybdenum (Mo), % 1.5 to 3.0
0.2 to 0.3
Nickel (Ni), % 11.5 to 13.5
1.7 to 2.0
Niobium (Nb), % 0.1 to 0.3
0
Nitrogen (N), % 0.2 to 0.4
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Vanadium (V), % 0.1 to 0.3
0