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EN 1.4938 Stainless Steel vs. AISI 431 Stainless Steel

Both EN 1.4938 stainless steel and AISI 431 stainless steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, 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 431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 16 to 17
15 to 17
Fatigue Strength, MPa 390 to 520
430 to 610
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
77
Shear Strength, MPa 540 to 630
550 to 840
Tensile Strength: Ultimate (UTS), MPa 870 to 1030
890 to 1380
Tensile Strength: Yield (Proof), MPa 640 to 870
710 to 1040

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Corrosion, °C 390
400
Maximum Temperature: Mechanical, °C 750
850
Melting Completion (Liquidus), °C 1460
1510
Melting Onset (Solidus), °C 1420
1450
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 30
26
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
3.0

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
16
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 160
140 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1920
1270 to 2770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 31 to 37
32 to 50
Strength to Weight: Bending, points 26 to 29
27 to 36
Thermal Diffusivity, mm2/s 8.1
7.0
Thermal Shock Resistance, points 30 to 35
28 to 43

Alloy Composition

Carbon (C), % 0.080 to 0.15
0 to 0.2
Chromium (Cr), % 11 to 12.5
15 to 17
Iron (Fe), % 80.5 to 84.8
78.2 to 83.8
Manganese (Mn), % 0.4 to 0.9
0 to 1.0
Molybdenum (Mo), % 1.5 to 2.0
0
Nickel (Ni), % 2.0 to 3.0
1.3 to 2.5
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 0.030
Vanadium (V), % 0.25 to 0.4
0