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S64512 Stainless Steel vs. SAE-AISI 4340M Steel

Both S64512 stainless steel and SAE-AISI 4340M steel are iron alloys. They have 87% of their average alloy composition in common. There are 33 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 S64512 stainless steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
710
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
6.0
Fatigue Strength, MPa 540
690
Impact Strength: V-Notched Charpy, J 47
18
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
72
Shear Strength, MPa 700
1360
Tensile Strength: Ultimate (UTS), MPa 1140
2340
Tensile Strength: Yield (Proof), MPa 890
1240

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Mechanical, °C 750
430
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 28
38
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 4.1
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 10
3.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.3
1.9
Embodied Energy, MJ/kg 47
26
Embodied Water, L/kg 110
55

Common Calculations

PREN (Pitting Resistance) 18
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
120
Resilience: Unit (Modulus of Resilience), kJ/m3 2020
4120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 40
84
Strength to Weight: Bending, points 31
51
Thermal Diffusivity, mm2/s 7.5
10
Thermal Shock Resistance, points 42
70

Alloy Composition

Carbon (C), % 0.080 to 0.15
0.38 to 0.43
Chromium (Cr), % 11 to 12.5
0.7 to 1.0
Iron (Fe), % 80.6 to 84.7
93.3 to 94.8
Manganese (Mn), % 0.5 to 0.9
0.65 to 0.9
Molybdenum (Mo), % 1.5 to 2.0
0.35 to 0.45
Nickel (Ni), % 2.0 to 3.0
1.7 to 2.0
Nitrogen (N), % 0.010 to 0.050
0
Phosphorus (P), % 0 to 0.025
0 to 0.012
Silicon (Si), % 0 to 0.35
1.5 to 1.8
Sulfur (S), % 0 to 0.025
0 to 0.012
Vanadium (V), % 0.25 to 0.4
0.050 to 0.1