How to make seamless carbon steel pipe?

How to make seamless carbon steel pipe?

Hot-rolled (extruded seamless steel pipe): round pipe is heated and perforated by three-roll rolling, rolled or extruded, separated, sizing (or pressed), cooled, straightened, and hydraulically tested (or detected) and marked for storage.

The raw material is rolled up seamlessly through the pipe, and the embryo grows through the pipe and is cut into a blank space of about one meter in the cutting machine, which is heated to the furnace body through the conveyor belt. The billets are placed in the furnace at a temperature of about 1200 degrees Celsius. The fuel is hydrogen or acetylene. Temperature control is a key issue. After the pipe punch is released by air pressure.

The commonly used punch is the tapered roller punch. The punch has high production efficiency, good product quality, strong perforation and diameter expansion capability, and can wear all kinds of steel. After perforation, the tube is three-rolled, rolled or extruded. Determine the size from the pipe. High-speed rotary taper drills are machined from perforated steel billets. The diameter of the pipe is determined by the length of the drill bit of the sizing machine. After cooling, the cooling pipe is put into the cooling tower through the spray cooling pipe and needs to be straightened. The straightened belt conveyor is sent to a metal detector (or pressure test) for in-house testing.

If the inner tube has cracks and air bubbles, it will be detected. Once the steel is selected, a strict quality control manual should be applied. After the steel quality, quantity, size, coating batch number, etc. The crane is hoisted into the warehouse.

Cold-drawn (rolled) seamless steel pipe: perforated pipe thermal annealing pickling (copper) multi-pass drawing (cold) pipe straightening heat treatment hydraulic test label storage.

Cold-drawn (rolled) seamless pipe is rolled more than hot-rolled seamless steel pipes. The first three steps of their production process are basically the same. The difference starts at step 4. After the tube is empty, begin annealing. A special pickling solution is used after annealing. Oiled after pickling. After repeated stretching (cold), tube blank, special heat treatment. After heat treatment, it must be straightened. The straightened belt conveyor is sent to a metal detector (or pressure test) for in-house testing. If the inner tube has cracks and air bubbles, it will be detected. Once the steel is selected, a strict quality control manual should be applied. After the steel quality, quantity, size, coating batch number, etc. The crane is hoisted into the warehouse.

Read more：seamless vs welded pipe

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