For products with high quality level or special requirements of customers, the Marketing Department shall organize relevant personnel to fully review these requirements before signing the contract to ensure that customer requirements can be met. When necessary, the company's technical staff will explain to the customer and give professional advice.

For incoming raw materials, full-time inspectors shall inspect the appearance, size and physical and chemical properties of the furnace or batch to ensure that the raw materials meet the requirements before putting into production and provide reliable material guarantee for production. Conduct regular summary analysis and review of raw material inspection results as the basis for supplier selection and evaluation.

In order to ensure that the steel pipes we produce meet customer requirements, we regularly inspect, inspect and supervise the key control points of the production process, and regularly confirm the special process to ensure that each process meets the process control guidelines. The key characteristics of the product shall be inspected by full-time process inspectors and testers, including flattening test, hydraulic test, non-destructive test, physical and chemical test, dimensional inspection, appearance inspection, etc., to ensure that the product meets the steel pipe acceptance criteria.

After the steel pipe is produced, we will coat the surface of the steel pipe according to customer requirements, including: black paint, varnish, anti-rust oil, etc. These materials ensure that the steel pipe has a short-term anti-rust effect during transportation.

In order to ensure the traceability of steel pipes, each steel pipe is identified with a unique pipe number or bar code during the production process. After the final coating (when required), according to customer and standard requirements, spray complete marking on the pipe body. During this process, the operator will check and transfer the unique pipe number identification one by one to ensure the traceability of the steel pipe.

The packaging of the product plays a vital role in the protection of the product in the transportation link, so United Steel Pipe is also very concerned about it. According to the size, coating, processing type, etc. of the steel pipe, Lianzhong steel pipe usually uses pipe cap, PVC cloth, nylon sling, galvanized belt, fumigation wood and other materials to protect the steel pipe. At the same time, our engineers can also customize product packaging design solutions that are more robust, stable and easy to handle according to customer requirements.

Before the steel pipe is delivered, the full-time technical personnel of Lianzhong steel pipe carry out the final integrity inspection according to the product specification and quality plan requirements, including: production and monitoring and measuring equipment status, personnel, incoming material inspection, process inspection, final product inspection, packaging, spray label and other information to check one by one to ensure that the products meet the customer requirements. After passing the inspection, the quality assurance department of Lianzhong Steel Pipe issues a product quality certificate according to each batch of shipped products.