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EN 1.4938 Stainless Steel vs. EN 1.4911 Stainless Steel

Both EN 1.4938 stainless steel and EN 1.4911 stainless steel are iron alloys. They have a moderately high 93% 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 1.4911 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 16 to 17
11
Fatigue Strength, MPa 390 to 520
530
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
76
Shear Strength, MPa 540 to 630
640
Tensile Strength: Ultimate (UTS), MPa 870 to 1030
1070
Tensile Strength: Yield (Proof), MPa 640 to 870
970

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Maximum Temperature: Corrosion, °C 390
430
Maximum Temperature: Mechanical, °C 750
700
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 30
20
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 10
20
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.3
3.4
Embodied Energy, MJ/kg 47
49
Embodied Water, L/kg 110
130

Common Calculations

PREN (Pitting Resistance) 18
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 160
120
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1920
2410
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 31 to 37
38
Strength to Weight: Bending, points 26 to 29
30
Thermal Diffusivity, mm2/s 8.1
5.4
Thermal Shock Resistance, points 30 to 35
37

Alloy Composition

Boron (B), % 0
0.0050 to 0.015
Carbon (C), % 0.080 to 0.15
0.050 to 0.12
Chromium (Cr), % 11 to 12.5
9.8 to 11.2
Cobalt (Co), % 0
5.0 to 7.0
Iron (Fe), % 80.5 to 84.8
75.7 to 83.8
Manganese (Mn), % 0.4 to 0.9
0.3 to 1.3
Molybdenum (Mo), % 1.5 to 2.0
0.5 to 1.0
Nickel (Ni), % 2.0 to 3.0
0.2 to 1.2
Niobium (Nb), % 0
0.2 to 0.5
Nitrogen (N), % 0.020 to 0.040
0 to 0.035
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.5
0.1 to 0.8
Sulfur (S), % 0 to 0.015
0 to 0.015
Tungsten (W), % 0
0 to 0.7
Vanadium (V), % 0.25 to 0.4
0.1 to 0.4