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SAE-AISI 4340M Steel vs. EN 1.4807 Stainless Steel

Both SAE-AISI 4340M steel and EN 1.4807 stainless steel are iron alloys. They have 47% of their average alloy composition in common. There are 31 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 EN 1.4807 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
4.5
Fatigue Strength, MPa 690
120
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
75
Tensile Strength: Ultimate (UTS), MPa 2340
480
Tensile Strength: Yield (Proof), MPa 1240
250

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Maximum Temperature: Mechanical, °C 430
1000
Melting Completion (Liquidus), °C 1440
1390
Melting Onset (Solidus), °C 1400
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 38
12
Thermal Expansion, µm/m-K 13
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
39
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 1.9
6.8
Embodied Energy, MJ/kg 26
97
Embodied Water, L/kg 55
190

Common Calculations

PREN (Pitting Resistance) 2.2
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
18
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
160
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 84
17
Strength to Weight: Bending, points 51
17
Thermal Diffusivity, mm2/s 10
3.2
Thermal Shock Resistance, points 70
12

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.3 to 0.5
Chromium (Cr), % 0.7 to 1.0
17 to 20
Iron (Fe), % 93.3 to 94.8
36.6 to 46.7
Manganese (Mn), % 0.65 to 0.9
0 to 2.0
Molybdenum (Mo), % 0.35 to 0.45
0 to 0.5
Nickel (Ni), % 1.7 to 2.0
34 to 36
Niobium (Nb), % 0
1.0 to 1.8
Phosphorus (P), % 0 to 0.012
0 to 0.040
Silicon (Si), % 1.5 to 1.8
1.0 to 2.5
Sulfur (S), % 0 to 0.012
0 to 0.030
Vanadium (V), % 0.050 to 0.1
0