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EN 1.4020 Stainless Steel vs. SAE-AISI 4340M Steel

Both EN 1.4020 stainless steel and SAE-AISI 4340M steel are iron alloys. They have 71% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is EN 1.4020 stainless steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190 to 340
710
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 13 to 34
6.0
Fatigue Strength, MPa 340 to 540
690
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
72
Shear Strength, MPa 510 to 680
1360
Tensile Strength: Ultimate (UTS), MPa 770 to 1130
2340
Tensile Strength: Yield (Proof), MPa 430 to 950
1240

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Mechanical, °C 890
430
Melting Completion (Liquidus), °C 1390
1440
Melting Onset (Solidus), °C 1350
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Expansion, µm/m-K 17
13

Otherwise Unclassified Properties

Base Metal Price, % relative 11
3.9
Density, g/cm3 7.6
7.8
Embodied Carbon, kg CO2/kg material 2.5
1.9
Embodied Energy, MJ/kg 37
26
Embodied Water, L/kg 150
55

Common Calculations

PREN (Pitting Resistance) 23
2.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 220
120
Resilience: Unit (Modulus of Resilience), kJ/m3 460 to 2290
4120
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28 to 41
84
Strength to Weight: Bending, points 25 to 32
51
Thermal Shock Resistance, points 16 to 23
70

Alloy Composition

Carbon (C), % 0 to 0.15
0.38 to 0.43
Chromium (Cr), % 16.5 to 19
0.7 to 1.0
Iron (Fe), % 62.8 to 71.8
93.3 to 94.8
Manganese (Mn), % 11 to 14
0.65 to 0.9
Molybdenum (Mo), % 0
0.35 to 0.45
Nickel (Ni), % 0.5 to 2.5
1.7 to 2.0
Nitrogen (N), % 0.2 to 0.45
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 0.030
0 to 0.012
Vanadium (V), % 0
0.050 to 0.1