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SAE-AISI 4340 Steel vs. AISI 329 Stainless Steel

Both SAE-AISI 4340 steel and AISI 329 stainless steel are iron alloys. They have 72% 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 SAE-AISI 4340 steel and the bottom bar is AISI 329 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 360
240
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 22
17
Fatigue Strength, MPa 330 to 740
330
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 73
80
Shear Strength, MPa 430 to 770
440
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
710
Tensile Strength: Yield (Proof), MPa 470 to 1150
540

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 430
1100
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
16
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
16
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.7
3.1
Embodied Energy, MJ/kg 22
44
Embodied Water, L/kg 53
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
110
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
730
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 45
25
Strength to Weight: Bending, points 22 to 33
23
Thermal Diffusivity, mm2/s 12
4.3
Thermal Shock Resistance, points 20 to 38
19

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.080
Chromium (Cr), % 0.7 to 0.9
23 to 28
Iron (Fe), % 95.1 to 96.3
63.1 to 74
Manganese (Mn), % 0.6 to 0.8
0 to 1.0
Molybdenum (Mo), % 0.2 to 0.3
1.0 to 2.0
Nickel (Ni), % 1.7 to 2.0
2.0 to 5.0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 0.75
Sulfur (S), % 0 to 0.040
0 to 0.030