1.What is seamless steel pipe?

If you look at the steel tube in this picture, you can see that there are no welding gaps on its surface. It is called seamless steel tube because it is made of whole round steel perforated. According to the production method, seamless steel tube can be divided into hot rolled seamless steel tube, cold rolled seamless steel tube, cold drawn seamless steel tube, extruded seamless steel tube, pipe jacking, etc. According to the shape of section, seamless steel tube is divided into round and special-shaped, special-shaped tube has square, oval, triangle, hexagonal, melon seed, star, winged tube and a variety of complex shapes. The maximum diameter is 900mm and the minimum diameter is 4mm. According to different uses, there are thick wall seamless steel pipe and thin wall seamless steel pipe.

2.Seamless tube production process

The picture shows the production process of seamless tube. There are many kinds of production processes of seamless tube.

The main production process of hot rolled seamless steel pipe (△ main inspection process) :

Preparation and inspection of billet △→ heating of billet → perforation → rolling pipe → reheating of steel pipe → sizing (reducing) → heat treatment △→ straightening of finished pipe → finishing → inspection △ (non-destructive, physical and chemical inspection, table inspection) → storage

The main production process of cold rolled (drawn) seamless steel tube:

Billet preparation → pickling lubrication → cold rolling (drawing) → heat treatment → straightening → finishing → inspection

General seamless steel tube production process can be divided into cold drawing and hot rolled, cold rolled seamless steel tube production process generally more complicated than hot rolled, three-roll rolling tube billet must first, after the extrusion sizing test, if there is no response after crack on the surface of pipe have to be cut after cutting machine, cutting grow about a meter of billet. Then enter the annealing process, annealing to use acidic liquid pickling, pickling should pay attention to whether there are a lot of bubbling on the surface, if there are a lot of bubbling shows that the quality of the steel pipe can not reach the corresponding standard. The appearance of cold-rolled seamless steel pipe is shorter than that of hot-rolled seamless steel pipe, the wall thickness of cold-rolled seamless steel pipe is generally smaller than that of hot-rolled seamless steel pipe, but the surface looks brighter than that of thick-walled seamless steel pipe, the surface is not too rough, the caliber is not too much burr.

3.Features of seamless steel tube

The biggest feature of seamless steel pipe can be seen from the name, that is, there is no gap, because the steel pipe is a metal component, if you want to connect, it is to be welded, at this time there will be a weld, if the welding is not good, it is easy to use inconvenience. Seamless steel pipe is not welded seam, can bear the pressure from the internal.

Seamless steel pipe because of its own structure, so that it is very widely used in the application, basically more important transportation will use seamless steel pipe, it can be used to input oil, natural gas, gas, water and other fluids, can also be used to transport some solid materials.

It is made of round steel perforation, corresponding to the steel pipe made of hot bending steel plate, has better bending and torsional strength, and the pressure effect is better.

4. Uses of seamless steel pipe

Seamless steel tube has a very wide range of USES, including the structure, fluid conveying low and medium pressure boiler, high pressure boiler, chemical fertilizer equipment, petroleum cracking, geological drilling, diamond core drilling, oil drilling, shipbuilding, automobile axle tube, diesel engine, etc., can use seamless steel tube, using seamless steel tube can avoid the problems such as leakage, ensure the use effect, improve material utilization.

It can be seen that the application of seamless steel pipe is mainly reflected in three fields. One is the construction field, which can be used for underground pipeline transportation, including groundwater extraction when building. The second is the processing field, can be used in machining, bearing sleeve and other aspects. The third is the electrical field, including gas transmission pipeline, water power generation with the fluid pipeline.

5.Steel pipe exported to Vietnam

We are a large seamless steel pipe company, perennial sales to Vietnam, Turkey, Malaysia and other overseas countries, annual output value, quality service, if you have product demand, please contact us, looking forward to cooperating with you