1. Round Steel: The surface of round steel must be smooth with no visible dents or cracks. Additionally, inspect the cross-section of the seamless tube for any cracks. It's also necessary to test the material of the raw material. Tianzhan Steel Pipe sticks to using high-quality round steel from Jiangsu suppliers like 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 external surface polishing and internal hole defect cleaning 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 steel pipes. Phosphatizing and saponification are intended to lubricate the steel pipes, preventing scratches during the cold drawing process.

5. Heat-rolled Tube Pickling and Re-inspection: Compared to standard Q345B square rectangular steel tubes, Tianzhan Steel's cold drawn seamless steel tubes production process includes an additional heat-rolled tube pickling and 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 folds, severe scratches, or rough surfaces.

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

7. Cold Drawing: Q345B square rectangular tubes have a wide range of applications in industry. Tianzhan pays attention to several common issues that may arise during production to ensure high-quality finished products. For instance, transverse scratches on the surface of cold-drawn seamless steel tubes, cracks at the tube ends, incorrect cuts, and shape deviations. 8. Straightening: During the straightening process, an appropriate amount of pressure reduction is required for steel tubes. Additionally, it's crucial to continuously monitor the surface for pressure marks or scratches, and address them promptly if found. 9. Inspection: Professional measuring tools are used during the inspection of seamless tubes to measure the outer and inner diameters, wall thickness, tolerances for outer and inner diameters, ellipticity, length, bend, end face bevel angle, and burr check of the steel tube surfaces.