The cold drawn seamless pipe is often used in the mechanical structure and hydraulic equipment, where high dimensional accuracy and good surface finish are called for. Cold drawing refers to a process done at room temperature, whereby the steel plate or strip steel is pulled, bent, and drawn to form various shapes.
General Flow of Manufacturing Process
Solid Round Billet-Heating - Perforating - Heading - Annealing - Pickling - Oil Coating (Copper Plating) - Cold Drawing in Multiple Passes (Cold Rolling) - Semi-Finished Pipe - Heat Treatment - Straightening - Hydrostatic Testing(Non-Destructive Detection) - Marking - Acceptance into Warehouse
Differences between Hot-Rolled Pipe and Cold-Drawn Pipe
Steel tubes often need to be drawn several times in order to produce the required shape and tolerance. Between each drawing pass, the material should be annealed to restore some ductility and prepare it for further processing. From the outside, you can see that the cold-drawn seamless pipe is in small diameter below 127mm while the hot-rolled pipe has larger diameter. In fact, cold-drawn seamless pipe usually has higher precision than the hot-rolled type. Associatively, cold-drawn pipes cost higher than hot-rolled version.
Cold-drawn seamless pipes are the among the most strictly regulated pipe products in terms of outside diameter, wall thickness, and surface finish. They can be divided into different types: ordinary steel pipe, pipe for low-, medium-, and high-pressure boiler, alloy steel tube, stainless steel pipe, pipe for oil cracking application, thin-walled carbon steel pipe, thin-wall alloy steel tube, thin-wall stainless steel tube, and irregularly-shaped steel tube.
1 Process: cold drawing
2 Standards: GB/T8162/8163/3087/5310, ASME B36 10, ASTM A106/A53, ASTM
A179, API 5L/5CT, EN10210/10219
4 Materials: 10#, 20#,45#,16Mn, GRB, Q345B, X42-56, ST44, ST52 etc.
5 Testing: Eddy current, Hydrostatic, Ultrasonic, Intergranular corrosion etc.
6 Packing: in bundles with steel strips, seaworthy packing as per customer's requirements
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