I. Product Function
1. Main buried conveying pipelines for municipal drinking water and reclaimed water reuse, with the lined metal layer ensuring clean water quality;
2. Conveying pipeline networks for coastal saline sewage and mildly corrosive chemical media;
3. Circulating water systems for power plants, mine water supply and drainage, and large-scale long-distance farmland irrigation projects;
4. Special anti-corrosion pressure-bearing pipe material for urban underground utility tunnels and renovation of aging pipeline networks.
II. Specification and Material Parameter Table
Parameter Item | Production Range / Optional Type |
Nominal Diameter | DN100–DN3200; non-standard large diameters can be customized |
Carbon Steel Outer Layer Wall Thickness | 6mm–24mm |
Stainless Steel Lining Thickness | 1.5mm–4mm |
Forming Process | Mechanical rolling integral composite forming |
Optional Lining Materials | 304, 316L stainless steel |
Outer Base Material | Q235, 20# carbon steel |
Outer Wall Anti-Corrosion Treatment | 3PE coating, epoxy coal tar anti-corrosion coating, black anti-rust paint |
III. Material Combination Application Scenarios
1. Q235 carbon steel outer layer + 304 stainless steel lining: economical and general-purpose type for conventional tap water, irrigation, and non-corrosive reclaimed water;
2. Q235 carbon steel outer layer + 316L stainless steel lining: suitable for coastal salt spray and chlorine-containing sewage, resisting chloride ion corrosion;
3. 20# carbon steel outer layer + 316L stainless steel lining: suitable for high-temperature circulating water and mildly corrosive chemical media, resistant to high-temperature and high-pressure working conditions.
IV. Product Advantages
1. The mechanical rolling process ensures tight bonding between the inner and outer pipe walls, preventing delamination or separation during operation and providing stable bonding strength;
2. The outer carbon steel layer bears structural pressure, while the stainless steel lining provides corrosion resistance and hygienic performance, balancing pressure-bearing capacity with anti-corrosion performance;
3. The smooth stainless steel inner wall provides low fluid conveying resistance, resists scaling, and meets hygienic standards for drinking water;
4. The outer wall can be treated with multi-layer anti-corrosion processes, providing a significantly longer service life in buried applications than ordinary carbon steel pipelines;
5. It can be supplied with composite elbows, tees, and flanges made by the same process, ensuring a unified anti-corrosion system for the entire pipeline and convenient construction connection.