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EN 1.4404 Stainless Steel vs. SAE-AISI 4340M Steel

Both EN 1.4404 stainless steel and SAE-AISI 4340M steel are iron alloys. They have 72% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is EN 1.4404 stainless steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 270
710
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 14 to 43
6.0
Fatigue Strength, MPa 220 to 320
690
Impact Strength: V-Notched Charpy, J 91 to 93
18
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
72
Shear Strength, MPa 420 to 550
1360
Tensile Strength: Ultimate (UTS), MPa 600 to 900
2340
Tensile Strength: Yield (Proof), MPa 240 to 570
1240

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Maximum Temperature: Mechanical, °C 950
430
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 15
38
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 19
3.9
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 3.8
1.9
Embodied Energy, MJ/kg 52
26
Embodied Water, L/kg 150
55

Common Calculations

PREN (Pitting Resistance) 26
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 210
120
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 800
4120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21 to 32
84
Strength to Weight: Bending, points 20 to 26
51
Thermal Diffusivity, mm2/s 4.0
10
Thermal Shock Resistance, points 13 to 20
70

Alloy Composition

Carbon (C), % 0 to 0.030
0.38 to 0.43
Chromium (Cr), % 16.5 to 18.5
0.7 to 1.0
Iron (Fe), % 62.8 to 71.5
93.3 to 94.8
Manganese (Mn), % 0 to 2.0
0.65 to 0.9
Molybdenum (Mo), % 2.0 to 2.5
0.35 to 0.45
Nickel (Ni), % 10 to 13
1.7 to 2.0
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0 to 0.012
Silicon (Si), % 0 to 1.0
1.5 to 1.8
Sulfur (S), % 0 to 0.015
0 to 0.012
Vanadium (V), % 0
0.050 to 0.1