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SAE-AISI D4 Steel vs. SAE-AISI 8740 Steel

Both SAE-AISI D4 steel and SAE-AISI 8740 steel are iron alloys. They have 85% of their average alloy composition in common. There are 28 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 D4 steel and the bottom bar is SAE-AISI 8740 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 8.4 to 15
11 to 23
Fatigue Strength, MPa 310 to 920
270 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 74
73
Shear Strength, MPa 460 to 1210
370 to 400
Tensile Strength: Ultimate (UTS), MPa 760 to 2060
580 to 670
Tensile Strength: Yield (Proof), MPa 470 to 1540
380 to 570

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Melting Completion (Liquidus), °C 1430
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 31
39
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 4.2
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 5.0
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 8.0
2.6
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.3
1.5
Embodied Energy, MJ/kg 49
20
Embodied Water, L/kg 100
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 100 to 160
71 to 120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 27 to 75
20 to 24
Strength to Weight: Bending, points 24 to 47
20 to 22
Thermal Diffusivity, mm2/s 8.3
10
Thermal Shock Resistance, points 23 to 63
17 to 20

Alloy Composition

Carbon (C), % 2.1 to 2.4
0.38 to 0.43
Chromium (Cr), % 11 to 13
0.4 to 0.6
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 80.6 to 86.3
96.5 to 97.7
Manganese (Mn), % 0 to 0.6
0.75 to 1.0
Molybdenum (Mo), % 0.7 to 1.2
0.2 to 0.3
Nickel (Ni), % 0 to 0.3
0.4 to 0.7
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0 to 0.6
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Vanadium (V), % 0 to 1.0
0

Comparable Variants