Zhongda New Materials’ patent for “a production process for austenitic stainless steel seamless tubes used in high-pressure hydrogen storage and transportation” has been approved
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Recently, the patent titled “Production process for austenitic stainless steel seamless tubes for high-pressure hydrogen storage and transportation”, applied for by Zhejiang Zhongda New Materials Co., Ltd., was approved. The abstract indicates that this invention provides a production process for austenitic stainless steel seamless tubes used for high-pressure hydrogen storage and transportation; it falls within the field of metal material processing. This process involves using a combined method of electroslag remelting and vacuum induction melting to produce steel ingots ； The steel ingot is heated to 1200°C and held at that temperature for over 10 hours; it is then forged alternately along the X, Y, and Z axes to carry out multi-directional forging to form the billet. It is held at 600°C for 3 hours to decompose the strip-like ferrite ； Then vacuum controlled rolling is carried out, with rough rolling and finish rolling performed separately, followed by a combined heat treatment: solution treatment at 1040–1080°C for 0.5–2 hours, after which quenching in water is done ； Vacuum nitriding at 550℃ for 4 hours to form a nitrogen-rich surface layer ； Finally, a functional coating is prepared by applying a polyimide-based composite coating containing molybdate and graphene to the outer surface of the tube; this coating is then cured through laser-induced cross-linking using a 250W laser, resulting in austenitic stainless steel seamless tubes that meet the key requirements for strength, resistance to hydrogen embrittlement, and long-term service life in high-pressure hydrogen storage applications.
Zhejiang Zhongda New Materials Co., Ltd. is a small and medium-sized enterprise characterized by its specialization, innovation, and uniqueness; it is also a high-tech enterprise (as of 2024), and it operates as part of the Zhongda United Holding Group. The company was established on December 29, 1997, and is located at No. 31, Xiantan Temple, Nongfeng Village, Baibu Town, Haiyan County, Jiaxing City, Zhejiang Province. It is currently in operation, and its business scope includes the research and development of new alloy materials ； Stainless steel strips, stainless steel sheets, stainless steel rods, stainless steel wires, stainless steel castings, stainless steel pipes, stainless steel fittings, metal functional materials, superalloys, corrosion-resistant alloys – manufacturing and processing ； Pressure pipeline installation services ； Import and export of goods, as well as import and export of technologies (**except for goods and technologies whose import and export are restricted to certain companies or prohibited). (Except for projects that require approval according to law, business activities may be carried out independently in accordance with the law based on the business license). Wait, the corporate brand projects include Zhongda New Materials.
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