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SAE-AISI 4340M Steel vs. EN 1.4525 Stainless Steel

Both SAE-AISI 4340M steel and EN 1.4525 stainless steel are iron alloys. They have 79% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (6, 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 1.4525 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 6.0
5.6 to 13
Fatigue Strength, MPa 690
480 to 540
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
76
Tensile Strength: Ultimate (UTS), MPa 2340
1030 to 1250
Tensile Strength: Yield (Proof), MPa 1240
840 to 1120

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Mechanical, °C 430
860
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1400
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 38
18
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
13
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.9
2.8
Embodied Energy, MJ/kg 26
39
Embodied Water, L/kg 55
130

Common Calculations

PREN (Pitting Resistance) 2.2
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
68 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 4120
1820 to 3230
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 84
36 to 45
Strength to Weight: Bending, points 51
29 to 33
Thermal Diffusivity, mm2/s 10
4.7
Thermal Shock Resistance, points 70
34 to 41

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.070
Chromium (Cr), % 0.7 to 1.0
15 to 17
Copper (Cu), % 0
2.5 to 4.0
Iron (Fe), % 93.3 to 94.8
70.4 to 79
Manganese (Mn), % 0.65 to 0.9
0 to 1.0
Molybdenum (Mo), % 0.35 to 0.45
0 to 0.8
Nickel (Ni), % 1.7 to 2.0
3.5 to 5.5
Niobium (Nb), % 0
0 to 0.35
Nitrogen (N), % 0
0 to 0.050
Phosphorus (P), % 0 to 0.012
0 to 0.035
Silicon (Si), % 1.5 to 1.8
0 to 0.8
Sulfur (S), % 0 to 0.012
0 to 0.025
Vanadium (V), % 0.050 to 0.1
0