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SAE-AISI 4340M Steel vs. SAE-AISI 1008 Steel

Both SAE-AISI 4340M steel and SAE-AISI 1008 steel are iron alloys. They have a moderately high 95% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is SAE-AISI 1008 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
93 to 100
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
22 to 33
Fatigue Strength, MPa 690
150 to 220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Shear Strength, MPa 1360
220 to 230
Tensile Strength: Ultimate (UTS), MPa 2340
330 to 370
Tensile Strength: Yield (Proof), MPa 1240
190 to 310

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 430
400
Melting Completion (Liquidus), °C 1440
1470
Melting Onset (Solidus), °C 1400
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
62
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
6.9
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
7.9

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
1.8
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.9
1.4
Embodied Energy, MJ/kg 26
18
Embodied Water, L/kg 55
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
78 to 91
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
92 to 260
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 84
12 to 13
Strength to Weight: Bending, points 51
13 to 15
Thermal Diffusivity, mm2/s 10
17
Thermal Shock Resistance, points 70
10 to 12

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.1
Chromium (Cr), % 0.7 to 1.0
0
Iron (Fe), % 93.3 to 94.8
99.31 to 99.7
Manganese (Mn), % 0.65 to 0.9
0.3 to 0.5
Molybdenum (Mo), % 0.35 to 0.45
0
Nickel (Ni), % 1.7 to 2.0
0
Phosphorus (P), % 0 to 0.012
0 to 0.040
Silicon (Si), % 1.5 to 1.8
0
Sulfur (S), % 0 to 0.012
0 to 0.050
Vanadium (V), % 0.050 to 0.1
0