In order to ensure that the steel pipes we produce meet customer requirements, we regularly inspect, check and supervise the key control points of the production process, and regularly confirm special processes to ensure that each process meets the process control criteria. The key characteristics of the product are checked by dedicated process inspectors and testers, including flattening test, water pressure test, non-destructive testing, physical and chemical testing, dimensional inspection, appearance inspection, etc., to ensure that the product meets the steel pipe acceptance criteria.