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S39274 Stainless Steel vs. SAE-AISI 4340M Steel

Both S39274 stainless steel and SAE-AISI 4340M steel are iron alloys. Both are furnished in the annealed condition. They have 65% 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 S39274 stainless steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270
710
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 17
6.0
Fatigue Strength, MPa 380
690
Poisson's Ratio 0.27
0.29
Rockwell C Hardness 28
55
Shear Modulus, GPa 81
72
Shear Strength, MPa 560
1360
Tensile Strength: Ultimate (UTS), MPa 900
2340
Tensile Strength: Yield (Proof), MPa 620
1240

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Mechanical, °C 1100
430
Melting Completion (Liquidus), °C 1480
1440
Melting Onset (Solidus), °C 1430
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 16
38
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 24
3.9
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 4.3
1.9
Embodied Energy, MJ/kg 60
26
Embodied Water, L/kg 180
55

Common Calculations

PREN (Pitting Resistance) 43
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
120
Resilience: Unit (Modulus of Resilience), kJ/m3 940
4120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 32
84
Strength to Weight: Bending, points 26
51
Thermal Diffusivity, mm2/s 4.2
10
Thermal Shock Resistance, points 25
70

Alloy Composition

Carbon (C), % 0 to 0.030
0.38 to 0.43
Chromium (Cr), % 24 to 26
0.7 to 1.0
Copper (Cu), % 0.2 to 0.8
0
Iron (Fe), % 57 to 65.6
93.3 to 94.8
Manganese (Mn), % 0 to 1.0
0.65 to 0.9
Molybdenum (Mo), % 2.5 to 3.5
0.35 to 0.45
Nickel (Ni), % 6.0 to 8.0
1.7 to 2.0
Nitrogen (N), % 0.24 to 0.32
0
Phosphorus (P), % 0 to 0.030
0 to 0.012
Silicon (Si), % 0 to 0.8
1.5 to 1.8
Sulfur (S), % 0 to 0.020
0 to 0.012
Tungsten (W), % 1.5 to 2.5
0
Vanadium (V), % 0
0.050 to 0.1