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EN 1.4315 Stainless Steel vs. EN 1.4438 Stainless Steel

Both EN 1.4315 stainless steel and EN 1.4438 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 1.4315 stainless steel and the bottom bar is EN 1.4438 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
180
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 45
41
Fatigue Strength, MPa 290
220
Impact Strength: V-Notched Charpy, J 90
90
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
79
Shear Strength, MPa 440
420
Tensile Strength: Ultimate (UTS), MPa 630
620
Tensile Strength: Yield (Proof), MPa 310
250

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 420
420
Maximum Temperature: Mechanical, °C 960
1000
Melting Completion (Liquidus), °C 1420
1450
Melting Onset (Solidus), °C 1380
1400
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
14
Thermal Expansion, µm/m-K 16
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 15
22
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.0
4.4
Embodied Energy, MJ/kg 43
60
Embodied Water, L/kg 150
160

Common Calculations

PREN (Pitting Resistance) 22
31
Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
200
Resilience: Unit (Modulus of Resilience), kJ/m3 240
150
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22
22
Strength to Weight: Bending, points 21
20
Thermal Diffusivity, mm2/s 4.0
3.7
Thermal Shock Resistance, points 14
14

Alloy Composition

Carbon (C), % 0 to 0.060
0 to 0.030
Chromium (Cr), % 18 to 20
17.5 to 19.5
Iron (Fe), % 65.7 to 73.9
57.3 to 66.5
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 0
3.0 to 4.0
Nickel (Ni), % 8.0 to 11
13 to 16
Nitrogen (N), % 0.12 to 0.22
0 to 0.1
Phosphorus (P), % 0 to 0.045
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015