BaoLai Steel Group, a manufacturer of galvanized steel pipes based in Tianjin, China, has released information detailing its production processes and quality control measures for hot-dipped galvanized steel pipes. The announcement underscores the importance of galvanization—a process that applies a protective zinc coating to steel or iron to prevent rust and corrosion, thereby extending the material's durability.
The company emphasizes that standardized processing procedures are essential for ensuring product quality. From raw material selection to final inspection, BaoLai Steel maintains stringent requirements at every stage. The company reports achieving nearly 100% customer satisfaction upon delivery due to its meticulous control over manufacturing steps.
BaoLai Steel's quality control begins with raw materials. The company selects high-grade zinc ingots with 99% zinc content, which are vital for effective galvanization. The factory operates five galvanizing lines: three blow-galvanizing lines for smaller pipes with lower zinc coating and two hoist-galvanizing lines for larger pipes with higher zinc content. Blow-galvanizing typically results in a smoother surface finish.
The overall hot-dip galvanizing process is divided into three stages: pre-treatment, galvanizing, and post-treatment. In the pre-treatment stage, pipes undergo acid washing to remove rust, water washing to remove acid, and application of a galvanizing auxiliary fluid to prevent oxidation and enhance zinc adhesion. The galvanizing stage involves lining up and drying the pipes to remove water from the auxiliary fluid, followed by immersion in molten zinc to form a protective layer. Post-treatment includes cooling to solidify the zinc layer, passivation to avoid oxidation and improve corrosion resistance, and water washing and drying to remove residual passivation solution. Finally, inspection ensures that finished products meet customer requirements.
BaoLai Steel's facility covers approximately 130,000 square meters and offers a one-stop service, including galvanizing, hydrostatic testing, threading, plain end, grooving, and painting. The company positions itself as a reliable supplier for applications such as conveying water, oil and gas, and other fluids. For more information, visit the company's website at BaoLai Steel Group.
