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Duplex Stainless Steel
Description of material
V2101MN (LDX2101®) is a low alloyed duplex stainless steel, with a low Nickel and high Nitrogen content, a correct Austenite/Ferrite balance and, generally, does not have a comparable corrosion resistance to other duplex grades, such as V225MN, due to its lower alloying content. This provides a cost saving compared to typical duplex grades. In any case, V2101MN (LDX2101®) has an excellent chloride stress corrosion cracking resistance and is less prone to form intermetallic phases than other duplex and super-duplex grades.
V2101MN (LDX2101®) has a widespread use, replacing most of the austenitic grades in buildings, bridges, structural work, reinforcing bars, architectural applications, tank and water treatments.
Argon Oxygen Decarburization
Due to its chemical balance, V2101MN (LDX2101®) offers a high resistance to stress corrosion cracking, replacing type 304L in some environments, but it has a critical pitting and crevice corrosion temperature lower than other duplex grades such as V225MN. It should also be noted that for this grade, as for every kind of stainless steel, surfaces should be free of contaminants and scale, and passivated for optimum resistance corrosion.
V2101MN (LDX2101®) has a cold working hardening capacity that is higher than V225MN and does not have cold formability as good as the austenitic grades. To restore mechanical properties and resistance corrosion, an annealing with a rapid cooling should be carried out.
V2101MN (LDX2101®) has very good machinability characteristics, and indeed is better than V225MN. However it is not as good as MV274MDE.
V2101MN can be welded with the same techniques as with austenitic stainless steels, but a special care and suitable choices must be used. No preheating is required. Although this grade has a high Nitrogen content and is less prone to form intermetallic phases, autogenous welding, without post-welding annealing, could reduce the corrosion resistance of welded parts. Over alloyed fillers and improved shielding gas should be used avoiding post welding annealing.
Large shapes and ingots require a suitable preheating. Avoid overheating or reaching the upper limit of forging temperature. Both small pieces, rolled rings or bars could be either air or rapid quenched after forging. However, an annealing with fast cooling after every kind of hot working is mandatory for best mechanical properties and corrosion resistance. Even though V2101MN forms less intermetallic phases, it is recommended to avoid a slow or improper cooling rate.