Why We Use Seamless Steel Pipes?

The time of issue:2014-1-2 8:46:10       Author:

As one type of the API steel pipe, seamless steel pipe has a hollow section and its features are as followed. It is made from solid tube through perforation capillary and hot rolling or cold rolling. It is widely used for conveying fluid pipes. The steel pipe and round steel, compared with solid steel, has lower weight, although the bending strength phase is the same as the common steel pipes. It is mainly used to make some things such as petroleum drill pipe, auto transmission shaft, bicycle frame and construction of steel scaffolding. The features of the API steel pipe are introduced. API steel pipe has high precision both inside and outside wall. After heat treatment the API steel pipe has no oxidation layer.

The lining has high cleanliness and the steel pipe can bear high pressure without cold bending formation. Flaring and flattening has no cracks. It can be used to make all kinds of complex deformation and mechanical processing. API steel pipes have white light and obvious metallic luster. And it is suitable for using in automotive steel tube and the users who have a high request for the precision of steel tube and bright and clean degree.

Hot-rolled seamless steel pipes are in automatic rolling on production unit. Through inspection we can clear the surface defects of the solid billet. Then we need to cut them into the required length and center on the perforation end face of the tube billet. We need to send it to a heating furnace and punch it on the punch. In perforated revolve and progress at the same time, under the action of roll and head, the tube billet's internal cavity will form gradually. Next we need to send it to automatically continue rolling mill. Finally approved by reeling mill all the whole wall thickness, the pipes can meet the specification requirements. Hot rolled seamless steel tube production by continuous rolling pipe unit is a more advanced method.

If you want to get a smaller size and better quality seamless steel pipe, you must adopt the method of cold rolling, cold drawing or both combined. Cold rolling is usually conducted on two-high rolling mill. The steel pipe in variable cross section is made from motionless conical head of rolling in the annular groove. The welded steel pipe and black steel pipe are also available. Extrusion to the heating tube billet in airtight extrusion cylinder will make the pipe integrated. This method can produce smaller diameter of steel pipe. The use of seamless steel pipes has a wide range. General-purpose seamless steel pipes made of ordinary carbon structural steel and low alloy steel or alloy structural steel rolling have the most production. The pipes are mainly used for conveying fluid pipe or structural components.

It can be divided into three categories according to utility supply: A, according to the chemical composition and mechanical properties of supply; B, according to the mechanical properties of supply; C, according to the supply water pressure test. According to a, b supply steel pipes, such as used for liquid under pressure, also must carry on the hydraulic pressure test. According to the classification there is a circular tube shape and special-shaped tube. Besides there is also oval tube, round tube, triangular tubes, hexagonal tubes, plum flower form, etc. And according to the different materials, the steel pipes can be divided into ordinary carbon structural tube, low alloy tube structure, high quality carbon structural tube, the structure of the alloy tube, stainless pipe, etc. Besides, according to the special use points, there are some other types such as boiler pipe, geological and oil pipeline. Finally, the internal and external surfaces of the steel pipes cannot have cracks, folding or defects. These defects shall be completely removed.

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