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EN 1.4938 Stainless Steel vs. AISI 440B Stainless Steel

Both EN 1.4938 stainless steel and AISI 440B stainless steel are iron alloys. They have a moderately high 94% of their average alloy composition in common. There are 31 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 1.4938 stainless steel and the bottom bar is AISI 440B stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 16 to 17
3.0 to 18
Fatigue Strength, MPa 390 to 520
260 to 850
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
77
Shear Strength, MPa 540 to 630
460 to 1110
Tensile Strength: Ultimate (UTS), MPa 870 to 1030
740 to 1930
Tensile Strength: Yield (Proof), MPa 640 to 870
430 to 1860

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Corrosion, °C 390
390
Maximum Temperature: Mechanical, °C 750
870
Melting Completion (Liquidus), °C 1460
1480
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 30
23
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 10
9.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.3
2.2
Embodied Energy, MJ/kg 47
31
Embodied Water, L/kg 110
120

Common Calculations

PREN (Pitting Resistance) 18
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 160
57 to 110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 31 to 37
27 to 70
Strength to Weight: Bending, points 26 to 29
24 to 45
Thermal Diffusivity, mm2/s 8.1
6.1
Thermal Shock Resistance, points 30 to 35
27 to 70

Alloy Composition

Carbon (C), % 0.080 to 0.15
0.75 to 1.0
Chromium (Cr), % 11 to 12.5
16 to 18
Iron (Fe), % 80.5 to 84.8
78.2 to 83.3
Manganese (Mn), % 0.4 to 0.9
0 to 1.0
Molybdenum (Mo), % 1.5 to 2.0
0 to 0.75
Nickel (Ni), % 2.0 to 3.0
0
Nitrogen (N), % 0.020 to 0.040
0
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015
Vanadium (V), % 0.25 to 0.4
0

Comparable Variants