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SAE-AISI 4340 Steel vs. S46500 Stainless Steel

Both SAE-AISI 4340 steel and S46500 stainless steel are iron alloys. They have 78% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340 steel and the bottom bar is S46500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 22
2.3 to 14
Fatigue Strength, MPa 330 to 740
550 to 890
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
75
Shear Strength, MPa 430 to 770
730 to 1120
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
1260 to 1930
Tensile Strength: Yield (Proof), MPa 470 to 1150
1120 to 1810

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 430
780
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
15
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.7
3.6
Embodied Energy, MJ/kg 22
51
Embodied Water, L/kg 53
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
43 to 210
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 45
44 to 68
Strength to Weight: Bending, points 22 to 33
33 to 44
Thermal Shock Resistance, points 20 to 38
44 to 67

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.020
Chromium (Cr), % 0.7 to 0.9
11 to 12.5
Iron (Fe), % 95.1 to 96.3
72.6 to 76.1
Manganese (Mn), % 0.6 to 0.8
0 to 0.25
Molybdenum (Mo), % 0.2 to 0.3
0.75 to 1.3
Nickel (Ni), % 1.7 to 2.0
10.7 to 11.3
Nitrogen (N), % 0
0 to 0.010
Phosphorus (P), % 0 to 0.035
0 to 0.015
Silicon (Si), % 0.15 to 0.35
0 to 0.25
Sulfur (S), % 0 to 0.040
0 to 0.010
Titanium (Ti), % 0
1.5 to 1.8

Comparable Variants