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SAE-AISI 4340 Steel vs. EN 1.4451 Stainless Steel

Both SAE-AISI 4340 steel and EN 1.4451 stainless steel are iron alloys. They have 64% of their average alloy composition in common. There are 30 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 4340 steel and the bottom bar is EN 1.4451 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 360
220
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 22
25
Fatigue Strength, MPa 330 to 740
370
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
80
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
750
Tensile Strength: Yield (Proof), MPa 470 to 1150
540

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 430
1100
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
17
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
20
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
3.8
Embodied Energy, MJ/kg 22
53
Embodied Water, L/kg 53
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
170
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
710
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 45
27
Strength to Weight: Bending, points 22 to 33
23
Thermal Diffusivity, mm2/s 12
4.5
Thermal Shock Resistance, points 20 to 38
16

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.030
Chromium (Cr), % 0.7 to 0.9
25 to 27
Copper (Cu), % 0
2.8 to 3.5
Iron (Fe), % 95.1 to 96.3
56.2 to 64.6
Manganese (Mn), % 0.6 to 0.8
0 to 1.5
Molybdenum (Mo), % 0.2 to 0.3
2.5 to 3.5
Nickel (Ni), % 1.7 to 2.0
5.0 to 7.0
Nitrogen (N), % 0
0.12 to 0.22
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.025