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EN 1.4938 Stainless Steel vs. EN 1.4031 Stainless Steel

Both EN 1.4938 stainless steel and EN 1.4031 stainless steel are iron alloys. They have a very high 95% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.4938 stainless steel and the bottom bar is EN 1.4031 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 16 to 17
11 to 13
Fatigue Strength, MPa 390 to 520
220 to 400
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
76
Shear Strength, MPa 540 to 630
400 to 540
Tensile Strength: Ultimate (UTS), MPa 870 to 1030
670 to 900
Tensile Strength: Yield (Proof), MPa 640 to 870
390 to 730

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Corrosion, °C 390
390
Maximum Temperature: Mechanical, °C 750
770
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 30
30
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
3.1
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
3.7

Otherwise Unclassified Properties

Base Metal Price, % relative 10
7.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 3.3
1.9
Embodied Energy, MJ/kg 47
27
Embodied Water, L/kg 110
100

Common Calculations

PREN (Pitting Resistance) 18
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 160
77 to 94
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1920
380 to 1360
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 31 to 37
24 to 32
Strength to Weight: Bending, points 26 to 29
22 to 27
Thermal Diffusivity, mm2/s 8.1
8.1
Thermal Shock Resistance, points 30 to 35
23 to 32

Alloy Composition

Carbon (C), % 0.080 to 0.15
0.36 to 0.42
Chromium (Cr), % 11 to 12.5
12.5 to 14.5
Iron (Fe), % 80.5 to 84.8
83 to 87.1
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
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