technology of seamless steel tube production

by:ChangZeng     2020-07-08
Generally, the production process of seamless steel pipe can be divided into cold drawing and hot rolling. The production process of cold rolled seamless steel pipe is generally more complicated than hot rolling. Three-
The roll rolling pipe blank must be tested first after extrusion and sizing. If there is no reaction after the surface crack of the pipe blank, it must be cut after cutting by the cutting machine, and the cut pipe blank is about 1 m long.
Then enter the annealing process, annealing with acid lotion, pay attention to whether there are many bubble surfaces when pickling, and if there are a large number of bubbles, the quality of the steel pipe cannot meet the corresponding standards.
The hot rolled seamless steel pipe has a shorter appearance on the cold rolled seamless steel pipe, and the wall thickness of the cold rolled seamless steel pipe is generally smaller than that of the hot rolled seamless steel pipe, but the surface looks brighter than that of the thick ASTM A123 seamless steel pipe, there is not much rough surface, the diameter is not a lot of burrs.
The delivery conditions of hot rolled seamless steel pipes are usually carried out after heat treatment. Hot-
After rolling, the seamless steel pipe QC should be strictly manually selected by the staff. After the quality inspection of the surface oil coating, the cold drawing experiment will be carried out many times. If the diameter of the stamping hole is too large, it cannot be straightened, the puncture experiment was carried out after hot rolling.
After straightening, pass the transmission device to the detector for testing, and then put the label and specifications into the warehouse.
Round tube blank and heating punch, three-
Rolling, rolling or rolling-pipe -sizing (or reducing)-cooling -
Water pressure test or inspection-
> The label, storage seamless steel pipe is made of solid tube ingot or perforated capillary tube, and then through hot rolling, cold rolling or cold plate.
The specification of seamless steel pipe is indicated by the outer diameter of the wall thickness mm.
The diameter of hot rolled seamless steel pipe is generally greater than 32mm, and the wall thickness is 2.
5-200mm, the diameter of cold-rolled seamless steel pipe is 6mm, and the wall thickness is 0.
25mm, the diameter thickness of the thin wall pipe to 5mm is less than 0.
25mm, cold rolling is higher than hot rolling.
It is usually made of high quality carbon steel such as 10, 20, 30, 35, 45, etc.
Low alloy steel such as 16Mn and 5MnV. , etc.
, Made of hot rolled or cold rolled steel such as 40Cr, 30 mnsi, 45mn, 40MnB, etc.
Seamless steel pipes made of low carbon steel such as 10 and 20 are mainly used for flow pipes.
Seamless work of medium carbon steel such as 45, 40Cr, for manufacturing mechanical parts such as cars and tractor parts.
Seamless steel pipes are generally used to ensure strength and flattening test.
Hot-rolled steel pipes in hot-rolled state or heat-treated state.
Cold rolling after heat treatment.
Hot rolling, as the name implies, the temperature of the rolling parts is high, so the deformation resistance is small and the large deformation can be achieved.
Taking the steel plate rolling system as an example, the thickness of continuous casting billet is about 230mm, and the thickness after rough rolling is 1 ~ 20mm.
At the same time, due to the small thickness of the steel plate, the dimensional accuracy requirements are relatively low, and the plate type problem is not easy to appear. The control convex is given priority.
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