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S30815 Stainless Steel vs. SAE-AISI 4340M Steel

Both S30815 stainless steel and SAE-AISI 4340M steel are iron alloys. Both are furnished in the annealed condition. They have 70% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is S30815 stainless steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
710
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 45
6.0
Fatigue Strength, MPa 320
690
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Shear Strength, MPa 480
1360
Tensile Strength: Ultimate (UTS), MPa 680
2340
Tensile Strength: Yield (Proof), MPa 350
1240

Thermal Properties

Latent Heat of Fusion, J/g 310
280
Maximum Temperature: Mechanical, °C 1020
430
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1360
1400
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 15
38
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 17
3.9
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.3
1.9
Embodied Energy, MJ/kg 47
26
Embodied Water, L/kg 160
55

Common Calculations

PREN (Pitting Resistance) 24
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 260
120
Resilience: Unit (Modulus of Resilience), kJ/m3 310
4120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25
84
Strength to Weight: Bending, points 22
51
Thermal Diffusivity, mm2/s 4.0
10
Thermal Shock Resistance, points 15
70

Alloy Composition

Carbon (C), % 0.050 to 0.1
0.38 to 0.43
Cerium (Ce), % 0.030 to 0.080
0
Chromium (Cr), % 20 to 22
0.7 to 1.0
Iron (Fe), % 62.8 to 68.4
93.3 to 94.8
Manganese (Mn), % 0 to 0.8
0.65 to 0.9
Molybdenum (Mo), % 0
0.35 to 0.45
Nickel (Ni), % 10 to 12
1.7 to 2.0
Nitrogen (N), % 0.14 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.012
Silicon (Si), % 1.4 to 2.0
1.5 to 1.8
Sulfur (S), % 0 to 0.030
0 to 0.012
Vanadium (V), % 0
0.050 to 0.1