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SAE-AISI 4340 Steel vs. ASTM A182 Grade F122

Both SAE-AISI 4340 steel and ASTM A182 grade F122 are iron alloys. They have 87% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340 steel and the bottom bar is ASTM A182 grade F122.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 360
220
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 22
23
Fatigue Strength, MPa 330 to 740
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Shear Strength, MPa 430 to 770
450
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
710
Tensile Strength: Yield (Proof), MPa 470 to 1150
450

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 430
600
Melting Completion (Liquidus), °C 1460
1490
Melting Onset (Solidus), °C 1420
1440
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 44
24
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
10
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
12

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
12
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 1.7
3.0
Embodied Energy, MJ/kg 22
44
Embodied Water, L/kg 53
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
140
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
520
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 45
25
Strength to Weight: Bending, points 22 to 33
22
Thermal Diffusivity, mm2/s 12
6.4
Thermal Shock Resistance, points 20 to 38
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Boron (B), % 0
0 to 0.0050
Carbon (C), % 0.38 to 0.43
0.070 to 0.14
Chromium (Cr), % 0.7 to 0.9
10 to 11.5
Copper (Cu), % 0
0.3 to 1.7
Iron (Fe), % 95.1 to 96.3
81.3 to 87.7
Manganese (Mn), % 0.6 to 0.8
0 to 0.7
Molybdenum (Mo), % 0.2 to 0.3
0.25 to 0.6
Nickel (Ni), % 1.7 to 2.0
0 to 0.5
Niobium (Nb), % 0
0.040 to 0.1
Nitrogen (N), % 0
0.040 to 0.1
Phosphorus (P), % 0 to 0.035
0 to 0.020
Silicon (Si), % 0.15 to 0.35
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 0
1.5 to 2.5
Vanadium (V), % 0
0.15 to 0.3
Zirconium (Zr), % 0
0 to 0.010