Zhejiang Kangxin Steel Pipe Co., Ltd. has built a 33‑patent portfolio covering critical manufacturing stages—heat treatment transfer, quenching, cold rolling, drawing, pickling, and connection structures . These patents optimize key processes: a precision cold rolling mill sprays pickling solution to clean pipe surfaces before rolling, preventing scratches ; a specialized cold drawing die uses a drive mechanism to unlock the mold base, ensuring stable installation and easier changeovers ; and a pickling system recycles acid liquor through a filter tank, improving surface quality while reducing environmental impact . The company also developed a patented heat treatment transfer device that increases lifting efficiency and ensures consistent quenching.

  In addition to process patents, Kangxin holds a patent for a high-strength, impact‑resistant seamless steel pipe . This design places an outer tube, a middle tube, and an inner tube with a buffer layer between each. The inner buffer layer contains elastic cushions and impact‑absorbing particles, while the outer layer uses foam carbon and energy‑absorbing balls . This multi‑layer structure significantly reduces the risk of cracking or deformation from external impact, effectively prolonging service life .

  With full‑process quality control and heat treatment technologies that relieve internal stresses and restore corrosion resistance, Kangxin delivers long‑lasting, high‑reliability stainless steel seamless pipes for demanding environments such as petrochemicals, heat exchangers, and pressure vessels .