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SAE-AISI 4340M Steel vs. S15500 Stainless Steel

Both SAE-AISI 4340M steel and S15500 stainless steel are iron alloys. They have 80% of their average alloy composition in common. There are 34 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 4340M steel and the bottom bar is S15500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
290 to 430
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
6.8 to 16
Fatigue Strength, MPa 690
350 to 650
Impact Strength: V-Notched Charpy, J 18
7.8 to 53
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 55
27 to 46
Shear Modulus, GPa 72
75
Shear Strength, MPa 1360
540 to 870
Tensile Strength: Ultimate (UTS), MPa 2340
890 to 1490
Tensile Strength: Yield (Proof), MPa 1240
590 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Mechanical, °C 430
820
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1400
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 38
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
13
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
2.7
Embodied Energy, MJ/kg 26
39
Embodied Water, L/kg 55
130

Common Calculations

PREN (Pitting Resistance) 2.2
15
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
98 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
890 to 4460
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
32 to 53
Strength to Weight: Bending, points 51
26 to 37
Thermal Diffusivity, mm2/s 10
4.6
Thermal Shock Resistance, points 70
30 to 50

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.070
Chromium (Cr), % 0.7 to 1.0
14 to 15.5
Copper (Cu), % 0
2.5 to 4.5
Iron (Fe), % 93.3 to 94.8
71.9 to 79.9
Manganese (Mn), % 0.65 to 0.9
0 to 1.0
Molybdenum (Mo), % 0.35 to 0.45
0
Nickel (Ni), % 1.7 to 2.0
3.5 to 5.5
Niobium (Nb), % 0
0.15 to 0.45
Phosphorus (P), % 0 to 0.012
0 to 0.040
Silicon (Si), % 1.5 to 1.8
0 to 1.0
Sulfur (S), % 0 to 0.012
0 to 0.030
Vanadium (V), % 0.050 to 0.1
0