The first domestic small-diameter continuous rolling seamless steel pipe production line, constructed by MCC CISDI as the general contractor, features fully centralized control and intelligent production operations. It adopts a fully three-dimensional digital design and utilizes core equipment with internationally advanced levels, such as a high-precision vertical piercing mill, a high-efficiency and high-quality three-roll continuous rolling mill, a low-loss and high-tension tension reduction mill, and a high-rigidity six-roll straightener. It mainly produces various special steel pipes, including oil casing pipes, ultra-supercritical boiler tubes, corrosion-resistant pipeline pipes, and high-precision engineering machinery pipes.