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EN 1.4408 Stainless Steel vs. EN 1.4451 Stainless Steel

Both EN 1.4408 stainless steel and EN 1.4451 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have 89% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is EN 1.4408 stainless steel and the bottom bar is EN 1.4451 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
220
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
25
Fatigue Strength, MPa 170
370
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 78
80
Tensile Strength: Ultimate (UTS), MPa 510
750
Tensile Strength: Yield (Proof), MPa 210
540

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 420
450
Maximum Temperature: Mechanical, °C 990
1100
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1390
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
17
Thermal Expansion, µm/m-K 16
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 18
20
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.7
3.8
Embodied Energy, MJ/kg 52
53
Embodied Water, L/kg 150
190

Common Calculations

PREN (Pitting Resistance) 26
39
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
170
Resilience: Unit (Modulus of Resilience), kJ/m3 110
710
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
27
Strength to Weight: Bending, points 18
23
Thermal Diffusivity, mm2/s 3.9
4.5
Thermal Shock Resistance, points 11
16

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.030
Chromium (Cr), % 18 to 20
25 to 27
Copper (Cu), % 0
2.8 to 3.5
Iron (Fe), % 62.4 to 71
56.2 to 64.6
Manganese (Mn), % 0 to 1.5
0 to 1.5
Molybdenum (Mo), % 2.0 to 2.5
2.5 to 3.5
Nickel (Ni), % 9.0 to 12
5.0 to 7.0
Nitrogen (N), % 0
0.12 to 0.22
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.025