Kangzeng Special Materials Group Co., Ltd., based in Gexi Industrial Park, Qingtian, Lishui, Zhejiang, has specialized for 30 years in large-diameter, heavy-wall seamless tubes in duplex stainless steel, nickel-based alloys and austenitic stainless steel. Its production range covers Φ16–1220 mm OD, 4–120 mm wall thickness, 4–16 m length and up to 6 tonnes per tube. Main products include high-pressure boiler tubes, oil and petrochemical tubes, and high-pressure gas cylinder tubes, serving nuclear power, oil, petrochemical and advanced energy equipment industries globally with reliable quality.