1. Round Steel: The surface of the round steel must be smooth with no visible dents or cracks. Next, inspect the cross-section of the seamless tube for any cracks. Additionally, test the material of the raw material. Tian Zhan Steel Pipe strictly selects high-quality round steel from Jiangsu's leading suppliers such as Zhongtian, Huai Steel, and Changqiang, ensuring product quality.

2. Round Steel Piercing: TianZhan Steel Tube measures the center point and drills a center hole to ensure the eccentricity issue of the finished steel tube products.

3. Seamless Tube: The wall thickness of the tube should be even, with minimal surface defects on both the inside and outside; equipment for surface polishing and cleaning of internal bore defects should be provided.

4. Pickling + Phosphatizing + Saponification: The primary purpose of pickling is to remove the oxide scale from the inner and outer surfaces of the steel pipes. Phosphatizing and saponification are aimed at lubricating the pipes to prevent scratches during the cold drawing process.

5. Heat-rolled Tube Pickling and Re-inspection: Compared to standard Q345B square rectangular steel tubes, Tianzhan Steel Tubes' cold drawn seamless steel tube production process includes an additional heat-rolled tube pickling re-inspection step. This is primarily to ensure the outer surface of the tube is free of folds, cracks, and other defects, and to exclude tubes with internal surface folds, severe scratches, and rough surfaces.

6. Heat Treatment: Annealing is a crucial process in the production of all cold drawn seamless steel tubes. The quality of annealing affects both the performance of the tubes and the removal of ferric oxide scale. Q345B square and rectangular steel tubes require the installation of non-oxidizing bright annealing furnace equipment.

7. Cold Drawing: Q345B square steel tubes find broad applications in the industry. To produce high-quality finished products, Tianzhan pays attention to several common issues that may arise during production. These include transverse scratches on the surface of cold-drawn seamless steel tubes, pipe end cracks, misalignment of cutting heads, and shape deviations, etc. 8. Straightening: During the straightening process of steel pipes, an appropriate amount of pressure reduction is required. Moreover, one should always monitor the surface for indentation or scratch issues, and address them promptly if any are found. 9. Inspection: Professional measuring tools are used for inspecting the outer and inner diameters, wall thickness, and tolerance of the outer and inner diameters, ellipticity, length, bend, end face bevel angle, and burr of the seamless steel tubes.