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EN 1.4311 Stainless Steel vs. EN 1.4374 Stainless Steel

Both EN 1.4311 stainless steel and EN 1.4374 stainless steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have a moderately high 91% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4311 stainless steel and the bottom bar is EN 1.4374 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
230
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 43
40
Fatigue Strength, MPa 270
340
Impact Strength: V-Notched Charpy, J 93
90
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Shear Strength, MPa 450
550
Tensile Strength: Ultimate (UTS), MPa 650
800
Tensile Strength: Yield (Proof), MPa 310
400

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 420
410
Maximum Temperature: Mechanical, °C 950
920
Melting Completion (Liquidus), °C 1420
1400
Melting Onset (Solidus), °C 1380
1360
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 16
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 16
14
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.1
2.9
Embodied Energy, MJ/kg 43
42
Embodied Water, L/kg 140
150

Common Calculations

PREN (Pitting Resistance) 21
23
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
270
Resilience: Unit (Modulus of Resilience), kJ/m3 240
400
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 23
29
Strength to Weight: Bending, points 21
25
Thermal Diffusivity, mm2/s 4.0
4.0
Thermal Shock Resistance, points 15
17

Alloy Composition

Carbon (C), % 0 to 0.030
0.050 to 0.1
Chromium (Cr), % 17.5 to 19.5
17.5 to 18.5
Copper (Cu), % 0
0 to 0.4
Iron (Fe), % 65.7 to 73.9
63.5 to 67.9
Manganese (Mn), % 0 to 2.0
9.0 to 10
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 8.5 to 11.5
5.0 to 6.0
Nitrogen (N), % 0.12 to 0.22
0.25 to 0.32
Phosphorus (P), % 0 to 0.045
0 to 0.035
Silicon (Si), % 0 to 1.0
0.3 to 0.6
Sulfur (S), % 0 to 0.015
0 to 0.030