Independent Specialists in Stainless Steels and Nickel Alloys since 1998.
316LN / 1.4429
316LN is a nitrogen-enhanced version of 316L stainless steel with improved strength and corrosion resistance.
904L
316LN (also known as UNS S31653 or 1.4429) is a variant of the 316L stainless steel alloy that contains an additional element, nitrogen. The nitrogen content in 316LN is typically between 0.1-0.2%, which increases the strength of the steel without significantly affecting its corrosion resistance properties.
Compared to standard 316L, 316LN has a slightly higher yield strength, tensile strength, and hardness. The increased strength of 316LN allows it to be used in high-stress applications such as pressure vessels, heat exchangers, and boilers. The steel also has good resistance to corrosion in high-temperature environments, due to the presence of nitrogen in its chemical composition.
The improved corrosion resistance of 316LN makes it a popular choice for use in the oil and gas industry, as well as in marine and chemical processing applications where high-temperature resistance and corrosion resistance are required.
It should be noted that while the addition of nitrogen improves the strength and corrosion resistance of 316LN, it also reduces its ductility. This means that 316LN may be more prone to cracking and brittle failure than other grades of stainless steel.
Chemical Composition of 316LN / 1.4429
The typical chemical composition of 316LN (also known as UNS S31653 or 1.4429) is as follows:
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Iron (Fe): balance
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Chromium (Cr): 16-18%
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Nickel (Ni): 11-14%
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Molybdenum (Mo): 2-3%
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Nitrogen (N): 0.1-0.2%
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Carbon (C): 0.03% max
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Manganese (Mn): 2% max
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Silicon (Si): 1% max
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Phosphorus (P): 0.045% max
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Sulfur (S): 0.03% max
The addition of nitrogen to the chemical composition of 316LN is what gives the steel its improved strength and corrosion resistance properties. The nitrogen content typically ranges between 0.1-0.2%. The carbon content is kept low (0.03% max) to help prevent carbide precipitation, which can lead to intergranular corrosion in certain environments.
It is important to note that the chemical composition of 316LN can vary depending on the manufacturing process and the specific supplier. Therefore, it's always a good idea to check with the supplier or consult the material certificate for the exact chemical composition of the 316LN being used in a specific application.
The physical and mechanical properties of 316LN (also known as UNS S31653 or 1.4429) are as follows:
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Density: 7.98 g/cm3
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Melting point: 1399-1454 °C (2550-2650 °F)
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Specific heat: 0.5 J/g·K
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Thermal conductivity: 16.3 W/m·K
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Thermal expansion: 15.9 x 10^-6/K
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Modulus of elasticity: 193 GPa
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Tensile strength: 550-700 MPa
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Yield strength: 240 MPa min
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Elongation: 40% min
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Hardness: Rockwell B90
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Impact toughness: 27 J (20 ft-lb)
Due to the addition of nitrogen, 316LN has a higher yield strength, tensile strength, and hardness than standard 316L. This means that it is able to withstand higher stress levels before deforming or breaking. However, it should be noted that the increased strength also reduces the ductility of the steel, making it more brittle and prone to cracking in certain situations.
316LN also has good resistance to corrosion in high-temperature environments. It is often used in the oil and gas industry, marine and chemical processing applications where high-temperature resistance and corrosion resistance are required.
It's important to note that the physical and mechanical properties of 316LN can vary depending on the manufacturing process and the specific supplier. Therefore, it's always a good idea to check with the supplier or consult the material certificate for the exact properties of the 316LN being used in a specific application.
Physical & Mechanical Properties of 316LN / 1.4429
Variants of 316
There are several variants of 316 stainless steel, which are designed for specific applications or to improve certain properties of the material. Some of the most common variants include:
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316Ti: This variant of 316 is alloyed with titanium to improve its resistance to corrosion, particularly in environments with high temperatures and high concentrations of chlorides.
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316L: This variant of 316 is low carbon, for improved resistance to intergranular corrosion and improved welding characteristics
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316H: This variant of 316 is a high carbon version, which improves its strength and hardness. It is often used in high-stress applications such as valves and pumps.
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316LN: This variant of 316 is nitrogen-alloyed to improve its strength and toughness. It is often used in high-stress applications such as aerospace and nuclear power plants.
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316F: This variant of 316 is free-machining, with added sulfur, it is often used in the manufacture of gears, bearings, and other precision components.
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316L Mod: This variant of 316 is modified to improve its machinability. It is often used in the manufacture of gears, bearings, and other precision components.
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316L-Si: This variant of 316 is alloyed with silicon to improve its resistance to corrosion and oxidation. It is often used in high-temperature applications such as furnace components and heat exchangers.
Please note that the above variants are just a general representation, and other variants exist to meet specific requirements, such as 316L-Mo for improved resistance to pitting and crevice corrosion, 316L-Cu for improved resistance to stress corrosion cracking.
AVAILABLE FORMS
Intamet offers 316LN in a wide range of forms, including the below:
