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SAE-AISI 4340M Steel vs. EN 1.7221 Steel

Both SAE-AISI 4340M steel and EN 1.7221 steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 31 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 SAE-AISI 4340M steel and the bottom bar is EN 1.7221 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 710
200 to 230
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
11 to 17
Fatigue Strength, MPa 690
290 to 390
Impact Strength: V-Notched Charpy, J 18
20 to 38
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
73
Tensile Strength: Ultimate (UTS), MPa 2340
650 to 780
Tensile Strength: Yield (Proof), MPa 1240
430 to 630

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 430
420
Melting Completion (Liquidus), °C 1440
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 38
44
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
2.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
1.5
Embodied Energy, MJ/kg 26
20
Embodied Water, L/kg 55
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
83 to 98
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
490 to 1050
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 84
23 to 27
Strength to Weight: Bending, points 51
21 to 24
Thermal Diffusivity, mm2/s 10
12
Thermal Shock Resistance, points 70
19 to 23

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.22 to 0.29
Chromium (Cr), % 0.7 to 1.0
0.8 to 1.2
Iron (Fe), % 93.3 to 94.8
96.8 to 98.3
Manganese (Mn), % 0.65 to 0.9
0.5 to 0.8
Molybdenum (Mo), % 0.35 to 0.45
0.15 to 0.3
Nickel (Ni), % 1.7 to 2.0
0
Phosphorus (P), % 0 to 0.012
0 to 0.025
Silicon (Si), % 1.5 to 1.8
0 to 0.6
Sulfur (S), % 0 to 0.012
0 to 0.030
Vanadium (V), % 0.050 to 0.1
0