Cold Drawn Seamless Tube Manufacturing Process

Steel tube products are popular for structural applications. You will find many steel tube manufacturers on the market that produce cold-drawn seamless steel tubes. So have you ever understood the manufacturing process of it? 

Wanzhi Steel is a steel pipe manufacturer in China. They have rich experience in manufacturing and exporting steel pipes. In Wanzhi Steel, you will surely get the best cold drawn seamless steel pipe. Next, Wanzhi Steel takes you through the manufacturing process of cold drawn seamless steel pipe.

Manufacturing Process

The basic process of cold-drawing: Hot-rolled bristle tube →bristle tube inspection and trimming → bristle tube pickling → bristle tube rechecking after pickling → cold-drawing → straightening before fine drawing → pickling and lubrication →Fine-drawing → Finished product pre-treatment → Storage.

1. Hair Tube

The wall thickness of the burr pipe should be uniform, with few defects on the inner and outer surfaces; the outer surface polishing and inner hole defect cleaning equipment should be configured.

2. Re-inspection

Compared with ordinary cold-drawn steel pipe, cold-drawn precision seamless tube production increases the hot-rolled burr pickling re-inspection process. This is mainly to ensure that the outer surface of the burr tube is free of defects such as folding and cracking, and to exclude the burr tube with defects such as folding, severe scoring, and pockmarking on the inner surface.

3. Tools

The surface finish of the tools used in the production of general cold-drawn precision seamless steel tubes is required to be above Ra0.4, the dimensional accuracy to be above H3, and the hardness to be above HRC70. At the same time, it is required that no topping or mold sticking steel can occur during the drawing process.

4. Annealing

Annealing is a very important process in the production of all cold-drawn tubes. The quality of annealing affects both the performance of the steel pipe and the removal of iron oxide. Cold-drawn precision steel tubes need to be configured without oxidation bright annealing furnace equipment.

5. Pickling

Precision seamless steel pipe in the sulfuric acid pickling process is prone to the formation of Fe2O3, Fe3O4-based "black slag", the formation of surface black spots in the subsequent production of Fe2O3, Fe3O4 is easily soluble in hydrochloric acid. To prevent the formation of black spots, 5-10g/l of NaCl is added to the acid pool.

Cold-drawn seamless steel pipe has high strength and can be machined to provide a range of desired properties. In addition, it has high dimensional accuracy, good machinability, and high tensile properties. As a result, cold-drawn seamless pipe has a variety of uses. Its specific applications include bushings, gaskets, bearings, and other mechanical components in automobiles, trucks, aircraft, and construction, agricultural and drilling equipment, as well as hydraulic cylinders.

Contact Wanzhi Steel to Get A Quote

Wanzhi Steel produces cold-drawn seamless steel pipes in compliance with industry standards. Its tubes undergo stringent testing and inspection as stipulated by different international standards to maintain their high quality. In addition, besides offering seamless steel pipes in various sizes and shapes, Wanzhi Steel also provides some value-added services such as perforation and sawing services. If you want to get the best steel pipe at a reasonable price, welcome to contact Wanzhi Steel for more details.