In Liaocheng, steel pipe products produced by some manufacturers are: 1. Welded steel pipes: including straight seam electric resistance welded steel pipes, spiral welded pipes, etc., widely used in construction, bridges, water conservancy, petrochemical, gas and other fields. 2. Precision steel pipes: including cold-drawn seamless steel pipes, cold-rolled precision steel pipes, etc., which are often used in automobile, motorcycle, bearing, machinery and other manufacturing industries. 3. Transformer steel pipe: used for power transformers, power transmission lines, etc. 4. Water supply steel pipe: suitable for urban water supply, gas, food industry and other fields. 5. Hydraulic cylinder steel pipe: used in various hydraulic transmission systems, mechanical transmission systems, etc. Steel pipe manufacturers in Liaocheng include Wanhe, Liaocheng Taifeng Pipe Industry, Liaocheng Longtai Steel Pipe, etc. The steel pipe products of these manufacturers are relatively stable in quality and are well received by the market.