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SAE-AISI 4340M Steel vs. S17400 Stainless Steel

Both SAE-AISI 4340M steel and S17400 stainless steel are iron alloys. They have 78% 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 S17400 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
280 to 440
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
11 to 21
Fatigue Strength, MPa 690
380 to 670
Impact Strength: V-Notched Charpy, J 18
7.6 to 86
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 55
27 to 43
Shear Modulus, GPa 72
75
Shear Strength, MPa 1360
570 to 830
Tensile Strength: Ultimate (UTS), MPa 2340
910 to 1390
Tensile Strength: Yield (Proof), MPa 1240
580 to 1250

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Mechanical, °C 430
850
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1400
1400
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
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
14
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
16
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
140 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
880 to 4060
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
32 to 49
Strength to Weight: Bending, points 51
27 to 35
Thermal Diffusivity, mm2/s 10
4.5
Thermal Shock Resistance, points 70
30 to 46

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.070
Chromium (Cr), % 0.7 to 1.0
15 to 17
Copper (Cu), % 0
3.0 to 5.0
Iron (Fe), % 93.3 to 94.8
70.4 to 78.9
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
3.0 to 5.0
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