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EN 1.4422 Stainless Steel vs. EN 1.4008 Stainless Steel

Both EN 1.4422 stainless steel and EN 1.4008 stainless steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a moderately high 95% 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 1.4422 stainless steel and the bottom bar is EN 1.4008 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
17
Fatigue Strength, MPa 380
300
Impact Strength: V-Notched Charpy, J 110
31
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
76
Tensile Strength: Ultimate (UTS), MPa 850
670
Tensile Strength: Yield (Proof), MPa 630
500

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Corrosion, °C 390
390
Maximum Temperature: Mechanical, °C 760
760
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1410
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 16
25
Thermal Expansion, µm/m-K 10
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 11
8.0
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 2.7
2.1
Embodied Energy, MJ/kg 37
30
Embodied Water, L/kg 110
100

Common Calculations

PREN (Pitting Resistance) 17
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
100
Resilience: Unit (Modulus of Resilience), kJ/m3 1000
630
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 30
24
Strength to Weight: Bending, points 25
22
Thermal Diffusivity, mm2/s 4.3
6.7
Thermal Shock Resistance, points 31
23

Alloy Composition

Carbon (C), % 0 to 0.020
0 to 0.1
Chromium (Cr), % 11 to 13
12 to 13.5
Copper (Cu), % 0.2 to 0.8
0
Iron (Fe), % 76.8 to 83.5
81.8 to 86.8
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 1.3 to 1.8
0.2 to 0.5
Nickel (Ni), % 4.0 to 5.0
1.0 to 2.0
Nitrogen (N), % 0 to 0.020
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.0030
0 to 0.025