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SAE-AISI 4340M Steel vs. ASTM A182 Grade F122

Both SAE-AISI 4340M steel and ASTM A182 grade F122 are iron alloys. They have 87% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
220
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
23
Fatigue Strength, MPa 690
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
76
Shear Strength, MPa 1360
450
Tensile Strength: Ultimate (UTS), MPa 2340
710
Tensile Strength: Yield (Proof), MPa 1240
450

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Maximum Temperature: Mechanical, °C 430
600
Melting Completion (Liquidus), °C 1440
1490
Melting Onset (Solidus), °C 1400
1440
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
24
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
10
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
12

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
12
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 1.9
3.0
Embodied Energy, MJ/kg 26
44
Embodied Water, L/kg 55
100

Common Calculations

PREN (Pitting Resistance) 2.2
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
140
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
520
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 84
25
Strength to Weight: Bending, points 51
22
Thermal Diffusivity, mm2/s 10
6.4
Thermal Shock Resistance, points 70
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 1.0
10 to 11.5
Copper (Cu), % 0
0.3 to 1.7
Iron (Fe), % 93.3 to 94.8
81.3 to 87.7
Manganese (Mn), % 0.65 to 0.9
0 to 0.7
Molybdenum (Mo), % 0.35 to 0.45
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 0.012
0 to 0.020
Silicon (Si), % 1.5 to 1.8
0 to 0.5
Sulfur (S), % 0 to 0.012
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 0
1.5 to 2.5
Vanadium (V), % 0.050 to 0.1
0.15 to 0.3
Zirconium (Zr), % 0
0 to 0.010