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SAE-AISI 4340 Steel vs. SAE-AISI 1146 Steel

Both SAE-AISI 4340 steel and SAE-AISI 1146 steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340 steel and the bottom bar is SAE-AISI 1146 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 360
190 to 200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 22
13 to 17
Fatigue Strength, MPa 330 to 740
240 to 400
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Shear Strength, MPa 430 to 770
410 to 440
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
670 to 730
Tensile Strength: Yield (Proof), MPa 470 to 1150
360 to 630

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 430
400
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 44
51
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
8.1

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
1.4
Embodied Energy, MJ/kg 22
18
Embodied Water, L/kg 53
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
93 to 97
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
340 to 1050
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 45
24 to 26
Strength to Weight: Bending, points 22 to 33
22 to 23
Thermal Diffusivity, mm2/s 12
14
Thermal Shock Resistance, points 20 to 38
20 to 22

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.42 to 0.49
Chromium (Cr), % 0.7 to 0.9
0
Iron (Fe), % 95.1 to 96.3
98.3 to 98.8
Manganese (Mn), % 0.6 to 0.8
0.7 to 1.0
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 1.7 to 2.0
0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.040
0.080 to 0.13

Comparable Variants