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SAE-AISI 4340M Steel vs. S30441 Stainless Steel

Both SAE-AISI 4340M steel and S30441 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 72% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is S30441 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
170
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
45
Fatigue Strength, MPa 690
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
76
Shear Strength, MPa 1360
400
Tensile Strength: Ultimate (UTS), MPa 2340
580
Tensile Strength: Yield (Proof), MPa 1240
230

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Mechanical, °C 430
940
Melting Completion (Liquidus), °C 1440
1420
Melting Onset (Solidus), °C 1400
1370
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 38
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
18
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
3.4
Embodied Energy, MJ/kg 26
50
Embodied Water, L/kg 55
150

Common Calculations

PREN (Pitting Resistance) 2.2
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
210
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
21
Strength to Weight: Bending, points 51
20
Thermal Diffusivity, mm2/s 10
4.0
Thermal Shock Resistance, points 70
13

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.080
Chromium (Cr), % 0.7 to 1.0
17.5 to 19.5
Copper (Cu), % 0
1.5 to 2.5
Iron (Fe), % 93.3 to 94.8
62 to 71.7
Manganese (Mn), % 0.65 to 0.9
0 to 2.0
Molybdenum (Mo), % 0.35 to 0.45
0
Nickel (Ni), % 1.7 to 2.0
8.0 to 10.5
Niobium (Nb), % 0
0.1 to 0.5
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.012
0 to 0.045
Silicon (Si), % 1.5 to 1.8
1.0 to 2.0
Sulfur (S), % 0 to 0.012
0 to 0.030
Tungsten (W), % 0
0.2 to 0.8
Vanadium (V), % 0.050 to 0.1
0