N6 vs N200 vs Ni201 Outlet Selection Guide: UNS Number + Class 5 Standard + Class 5 Working Conditions + 5 Steps to Avoid Pit

Published by Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd on 2026-08-07

Corresponding relationship between one or three nickel grades and UNS number
The corresponding UNS number of national standard N6 and American standard Ni200 is N02200, Carbon content is controlled within 0.10%The corresponding UNS number of national standard N4 and American standard Ni201 is N02201, Carbon content does not exceed 0.02%.Many export customers wonder if N6 and Ni200 are the same material., The chemical composition is identical., Distinguishing only from naming systems in different countries, Foreign trade documents, Material certificates must be marked with international UNS numbers, Overseas customers and customs can identify and approve.
II. Five international implementation standard systems
GB series standards are generally adopted for domestic projects, GB/T 2882‑2013 for seamless nickel tubes, GB/T 2054‑2013 for nickel plates, and GB/T 4435‑2010 for nickel rods.ASTM/ASME codes are widely used for North American and general export projects, ASME SB161‑2019 for seamless nickel tubes, ASME SB162‑2019 for nickel plates, and ASME SB160‑2019 for nickel rods.EU products comply with EN standards, JIS material specification for Japanese projects, DIN industrial standard can be selected for German projects, Orders from different regions must match locally approved material specifications.
Third, Ni200 and Ni201 material performance differences
The nickel content of the two nickel materials is not less than 99.0%, iron, copper, manganese, Sulfur and other impurities control indicators are basically the same, The core difference is carbon content.Ni201 strictly controls the low carbon index, the production process is more difficult, and the purchase price is 20%‑30% higher than Ni200.When the operating temperature reaches above 300℃, High carbon Ni200 is easy to precipitate carbon element at grain boundary, graphitization embrittlement of materials, Stress corrosion cracking occurs during long-term operation, Under high temperature conditions, only low carbon Ni201 material can be selected.Complete nickel plate grade comparison information can be found at: Four, five overseas conditions and medium selection recommendations
Ni200 is selected for North American caustic soda project with temperature lower than 300℃, and ASME American standard is matched;The high temperature concentrated alkali device with temperature exceeding 300℃ must be made of Ni201 material.EU chloralkali project Ni200 products adapted to EN European standards, JIS Standard Nickel Materials for Japanese Chemical Equipment, ASME American Standard Ni200 with stronger universality can be used for caustic soda projects in Southeast Asia, High temperature resistant Ni201 is preferred for Middle East high temperature petrochemical projects.
In terms of dielectric matching, Sodium hydroxide system with concentration above 30%, Ni200 is selected for low temperature section, Ni201 must be used in molten alkali environment at high temperature above 300℃Ni201 is recommended for high temperature organic acid conditions;Ni200 is used as chloride brine medium at normal temperature;Ni200 is carefully selected to control the use temperature under low temperature hydrofluoric acid conditions.
5. Real overseas project application cases
50% sodium hydroxide medium used for caustic soda evaporation project in North America, Operating temperature 320℃, ASME SB163 Ni201 Seamless Nickel Pipe, Equipment stable operation for five years without corrosion failureEN standard Ni200 is selected for the chlor-alkali saturated brine transmission pipeline of EU, and no pitting corrosion occurs after continuous operation for six years;Japan high temperature acetic acid condensation equipment using Ni201 pipe, long-term use of stable performance;ASME American Standard Ni200 is adopted for caustic soda plant at room temperature in Southeast Asia to meet corrosion protection requirements;Ni200 material has been selected incorrectly for export molten caustic soda project, embrittlement cracking of materials after half a year operation, Enterprises bear high compensation and logistics losses, After replacing Ni201, the equipment has operated safely for many years.
VI. Exit selection five-step pit avoidance guide
First, it is strictly prohibited to select Ni200 at temperatures ≥300℃ to prevent high temperature embrittlement cracking;second, Material documentation must be marked with the full UNS number, Only fill in national standard N6, N4 cannot pass overseas auditThird, the supply standard strictly matches the order requirements to avoid size deviation and cannot be installed on site;Fourth, check the single carbon content index of the material, and prevent Ni200 from being supplied as Ni201;Fifth, prepare SGS and CTI third-party inspection reports in advance for export orders to meet foreign inspection requirements.If you need details of plate selection, please refer to: VII. Advantages of Shaanxi Qianyi Tuoda Export Supporting Services
Relying on Baoji Titanium Industry Cluster Advantages, Shaanxi Qianyi Tuoda provides three free foreign trade technical services, One-to-one export nickel material selection support, According to export country, Medium temperature determination UNS designation and material standardsDN15‑DN300 specification Ni200, Ni201 seamless nickel pipe stock, covering American standard, European standard, Japanese standard products;Third party inspection report can be matched to meet the requirements of customs and customer audit.
epilogue
The key control point of nickel export is to accurately fill in the UNS material number, Low carbon Ni201 is selected for high temperature working condition, The supply standard matches the specifications of the country where the project is located.Standardized selection can avoid overseas customs clearance risks, avoid high claims losses in the later period, and ensure the smooth delivery of foreign trade projects.
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