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Cold-drawn tube production process
Apr 24, 2018

Cold drawn tubes are usually produced at a very low temperature through a series of cold draws and extractions. It can be said to be a more durable and better type of steel. The following are the various production processes and steps for cold drawn tubes:

The cold-drawn tube is made of hot-rolled steel coil as raw material, followed by pickling to remove oxide scale and then cold rolling. The finished product is rolled hard coil. Cold work hardening caused by continuous cold deformation increases the strength and hardness of the rolled hard coil, and the toughness As the index declines, the stamping performance will deteriorate and it can only be used for simple deformed parts. Rolled hard coils can be used as raw materials for hot dip galvanizing plants because hot dip galvanizing units are all equipped with an annealing line. The weight of rolled hard rolls is generally 6~13.5 tons, and the internal diameter of steel coils is 610mm. Hot rolling (extrusion seamless steel pipe): pipe blank → heating → perforation → three-roller oblique rolling, continuous rolling or extrusion → de-spooling → sizing (or reducing) → cooling → blank tube → straightening → hydrostatic test (or flaw detection) → mark → storage. Cold drawn (rolled) seamless steel pipe: pipe blank → heating → punching → start → annealing → pickling → oil coating (copper plating) → multi-pass cold drawing (cold rolling) → blank tube → heat treatment → straightening → water pressure Test (flaw detection) → mark → storage.

Cold drawn tubes are one type of steel tube, that is, they are classified according to different production processes and are different from hot rolled (expanded) tubes. In the process of expanding the capillary blank or raw material tube, it is made by multi-pass cold drawing process, and is usually performed on a single-chain or double-chain cold-drawing machine of 0.5-100 T. Cold-rolled (dial) steel pipe in addition to general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, oil cracking pipe, machining pipe, thick-walled pipe, small-caliber plus inner mold cold-drawn pipe other It also includes carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes, and special-shaped steel pipes. The cold-drawn steel pipe can have an outer diameter of 6mm, a wall thickness of 0.25mm, a thin-walled pipe outer diameter of up to 5mm, a wall thickness of less than 0.25mm, and an accuracy and surface quality that is significantly better than that of a hot-rolled (expanded) pipe, but is subject to a process. Constraints, their caliber and length are subject to certain restrictions.

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