New progress has been made in the development of wide-width Hastelloy coils by the nickel alloy project team at Baotai Group

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New breakthrough achieved in the wide-width strip of Hastelloy developed by Baotai Group’s nickel alloy project team 2025-09-15 11:04·Northwest Information News Recently, a new technical breakthrough was made in the wide-width strip of nickel-based UNSN10276 (Hastelloy), which was independently designed and developed by Baotai Group’s nickel alloy project team. They conducted experiments on high-precision cold rolling and high-temperature continuous heat treatment processes for Hastelloy strips of the specifications 0.6×1000～1219×Cmm, with a single coil weight exceeding 3.5 tons. After comprehensive testing, the overall performance of the product meets the requirements of ASTM B575; its inclusion level, corrosion resistance, and suitability for cold deep drawing all satisfy the design requirements in the field of plate heat exchangers. Hastelloy is a nickel-chromium-molybdenum alloy containing tungsten, and it is known as the \"super stainless steel\" among corrosion-resistant materials. This alloy is primarily used for devices, containers, and pipelines employed in strongly reducing corrosive media, strongly oxidizing-reducing corrosive media, as well as seawater environments. As a typical high-end nickel-based alloy material, the technology for producing wide-width strips of this material has long represented a gap in China’s industrial development. To date, only a few developed countries possess mature production techniques for this material, leaving China dependent on imports for the materials required in fields such as heat exchange. In light of this, and considering the urgent needs of the domestic market as well as the current development status of nickel-based alloys at Baotai Group, the group launched this research project. The aim is to fill the technical gaps in China’s field of nickel-based alloys by studying the entire production process, including the high-purity melting of such alloys, hot rolling, high-precision cold rolling, and high-temperature continuous heat treatment, thereby laying a solid foundation for the industrialization of nickel-based alloys at Baotai Group. To meet the technical requirements for developing wide-width Hastelloy coils, the project team’s engineers conducted theoretical research and, taking into account actual production conditions, devised a reasonable technical solution. Starting with the selection of raw materials and improving the refining techniques used in the two-step melting process, they determined the key processes for producing ingots with high weight and high purity ； By systematic research, the key process parameters for true thermal deformation are identified to ensure the rationality and stability of the thermoforming process ； Focusing on the mechanism of coordinated control in high-precision strip cold rolling and heat treatment, systematic innovative research was conducted in three areas: the stress-strain characteristics of wide-width Hastelloy strips, temperature field control in continuous rolling lines, metal microstructure evolution control, and the digitalization of manufacturing equipment. As a result, a production process for ultra-thin and ultra-wide nickel-based strips was successfully developed. Going forward, the project team will carry out research and development work on wide-width strips made from various nickel-based alloys (pure nickel series, Inconel series, Incoloy series, Hastelloy series, nickel-copper alloy series) to high quality and standards, as well as promote their application. On this basis, they will further develop the accompanying manufacturing processes and production lines, thereby laying a solid foundation for achieving industrialization.