- Our Vision: To be an excellent supplier of global industrial piping system solutions.
- Our Mission: To help global industrial pipeline construction with the products made in China.
- Our Vision: To be an excellent supplier of global industrial piping system solutions.
- Our Mission: To help global industrial pipeline construction with the products made in China.
Shanghai Toko Technology Co.,ltd is famous Nickel Alloy Seamless Pipe/Tube Manufacturers and Nickel Alloy Seamless Pipe/Tube Suppliers. We are committed to manufacturing and exporting stainless steel seamless pipe, stainless steel welded pipes, stainless steel fittings and flanges, nickel alloy products, Titanium seamless and welded tubes, etc. Our factories are all ISO&PED certificated, and the products can be produced in standard ASTM, JIS, DIN, EN, GOST, etc. Our products are widely used in the Oil and Gas, Petrochemical, Sugar Refining, Water Process, Desalination, Geothermal industry etc. We exported to dozens of countries and regions such as USA, Canada, Japan, Germany, France, Korea, Turkey ect.
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As high-end pipe products, nickel alloy seamless pipes have shown excellent corrosion resistance, high temperature resistance and high metallurgical stability in many fields such as oil and gas, petrochemicals, desalination and nuclear industries, and are indispensable key materials in these industries. As a nickel alloy seamless pipe manufacturer with ISO and PED certification, we are well aware of the importance of pickling, polishing and passivation to improve product performance, extend service life and meet customers' stringent requirements.
Pickling is a key step to remove oxides, stains and rust on the surface of nickel alloy seamless pipes, laying a good foundation for subsequent polishing and passivation. We use professional pickling solutions, which are carefully formulated according to the specific composition of nickel alloys and the surface cleanliness to be achieved, ensuring that contaminants can be effectively removed without causing excessive corrosion to the substrate.
Pretreatment: Thoroughly clean the nickel alloy seamless pipe to remove attachments such as grease, dust, etc., and use solvent cleaning or alkaline cleaning agents to ensure that the surface is clean and free of impurities.
Pickling operation: The pretreated pipe is immersed in the pickling solution with a temperature controlled within a certain range. The time is adjusted according to the thickness of the pipe and the activity of the pickling solution. By precisely controlling the pickling time and temperature, the surface oxide layer can be effectively removed and the occurrence of hydrogen embrittlement can be avoided.
Neutralization and rinsing: After the pickling is completed, the pipe is immediately transferred to the neutralization tank, and the residual acid is neutralized with a weak alkaline solution, followed by rinsing with a large amount of clean water to ensure that all chemical residues are completely removed.
Polishing treatment is intended to further improve the surface finish of the nickel alloy seamless pipe to meet the requirements of mirror or specific roughness, improve the appearance and corrosion resistance. According to customer needs, we use two methods: mechanical polishing and chemical polishing:
Mechanical polishing: Use grinding wheels or polishing cloths of different particle sizes, combined with appropriate polishing agents, to gradually finely polish the surface of the nickel alloy seamless pipe. This process usually requires multiple processes, from rough polishing to fine polishing, until the required surface finish is achieved.
Chemical polishing: The surface of the nickel alloy seamless pipe is chemically polished by a specific chemical solution under certain temperature and time conditions. Chemical polishing can not only improve the surface brightness, but also evenly remove tiny defects, form a protective film, and enhance corrosion resistance.
Passivation treatment is the final step to improve the corrosion resistance of nickel alloy seamless pipes. By forming a dense oxide film, it effectively isolates the external environment from the erosion of the substrate. We use the following methods to achieve efficient passivation:
Electrochemical passivation: Using the principle of electrolysis, in a solution containing an oxidant, an appropriate voltage is applied to the nickel alloy seamless pipe to promote the formation of a uniform passivation film on the surface. This method is suitable for pipes with complex shapes and difficult to be uniformly treated by chemical methods.
Chemical passivation: The nickel alloy seamless pipe is immersed in a solution containing a passivator to generate a protective oxide film on the surface through a chemical reaction. Chemical passivation has the advantages of simple operation and low cost, and is suitable for mass production.
Company advantages and quality control
Advanced equipment: We have advanced testing laboratories and complete testing equipment including spectrometers, metallographic microscopes, tensile testing machines, low-temperature testing machines, X-ray detection machines, etc., to ensure that every step from raw materials to finished products is strictly inspected.
Raw material selection: All raw materials are fully certified to ensure that their chemical composition and mechanical properties meet the highest standards, laying a solid foundation for subsequent processing.
Customized service: According to customer requirements and international standards, we provide 100% finished product inspection to ensure that each batch of products can meet specific chemical composition, mechanical properties, non-destructive testing and high-precision dimensional requirements.
Continuous improvement: We continuously optimize production processes and testing processes based on customer feedback and internal test results to ensure that our products always maintain industry-leading levels.
As a manufacturer of nickel alloy seamless pipes, we not only rely on advanced technology and equipment for pickling, polishing and passivation, but also through a strict quality management system and a spirit of continuous improvement to ensure that each nickel alloy seamless pipe can serve customers around the world in the best condition. Whether it is used in harsh oil and gas extraction environments or in the demanding nuclear industry, we can provide high-performance, durable product solutions.