Before the steel pipe is shipped, Lianzhong Steel Pipe's full-time technical personnel conduct a final integrity inspection according to product specifications and quality plan requirements, including: production and monitoring measurement equipment status, personnel, incoming material inspection, process inspection, final product inspection, packaging, spraying and other information are checked one by one to ensure that the product meets customer requirements. After passing the inspection, Lianzhong Steel Pipe's quality assurance department issues a product quality certificate based on each batch of shipped products.