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ASTM A182 Grade F6b vs. SAE-AISI 4720 Steel

Both ASTM A182 grade F6b and SAE-AISI 4720 steel are iron alloys. Both are furnished in the annealed condition. 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 (3, in this case) are not shown.

For each property being compared, the top bar is ASTM A182 grade F6b and the bottom bar is SAE-AISI 4720 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 260
150
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 18
25
Fatigue Strength, MPa 440
260
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
73
Shear Strength, MPa 530
310
Tensile Strength: Ultimate (UTS), MPa 850
490
Tensile Strength: Yield (Proof), MPa 710
350

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 750
410
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 25
39
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 3.2
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 8.0
2.9
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.2
1.6
Embodied Energy, MJ/kg 30
21
Embodied Water, L/kg 100
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1280
330
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 30
17
Strength to Weight: Bending, points 26
18
Thermal Diffusivity, mm2/s 6.7
10
Thermal Shock Resistance, points 31
14

Alloy Composition

Carbon (C), % 0 to 0.15
0.17 to 0.22
Chromium (Cr), % 11.5 to 13.5
0.35 to 0.55
Copper (Cu), % 0 to 0.5
0
Iron (Fe), % 81.2 to 87.1
96.7 to 97.8
Manganese (Mn), % 0 to 1.0
0.5 to 0.7
Molybdenum (Mo), % 0.4 to 0.6
0.15 to 0.25
Nickel (Ni), % 1.0 to 2.0
0.9 to 1.2
Phosphorus (P), % 0 to 0.020
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.040