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EN 1.4421 Stainless Steel vs. SAE-AISI 4340M Steel

Both EN 1.4421 stainless steel and SAE-AISI 4340M steel are iron alloys. They have 81% 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 EN 1.4421 stainless steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 11 to 17
6.0
Fatigue Strength, MPa 380 to 520
690
Impact Strength: V-Notched Charpy, J 30 to 67
18
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Tensile Strength: Ultimate (UTS), MPa 880 to 1100
2340
Tensile Strength: Yield (Proof), MPa 620 to 950
1240

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Mechanical, °C 870
430
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
38
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 12
3.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.6
1.9
Embodied Energy, MJ/kg 36
26
Embodied Water, L/kg 130
55

Common Calculations

PREN (Pitting Resistance) 18
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 140
120
Resilience: Unit (Modulus of Resilience), kJ/m3 960 to 2270
4120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 31 to 39
84
Strength to Weight: Bending, points 26 to 30
51
Thermal Diffusivity, mm2/s 4.4
10
Thermal Shock Resistance, points 31 to 39
70

Alloy Composition

Carbon (C), % 0 to 0.060
0.38 to 0.43
Chromium (Cr), % 15.5 to 17.5
0.7 to 1.0
Iron (Fe), % 74.4 to 80.5
93.3 to 94.8
Manganese (Mn), % 0 to 1.0
0.65 to 0.9
Molybdenum (Mo), % 0 to 0.7
0.35 to 0.45
Nickel (Ni), % 4.0 to 5.5
1.7 to 2.0
Phosphorus (P), % 0 to 0.035
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
Vanadium (V), % 0
0.050 to 0.1