Carbon Steel Pipe

What is large diameter thick wall seamless steel pipe?

Large diameter thick wall seamless steel pipe is made of ingot or solid round steel by perforation and then by hot rolling. Large diameter thick wall seamless steel pipe has an important position in our steel pipe industry. According to incomplete statistics, there are about 240 seamless steel pipe manufacturers in China, and about 250 sets of large diameter thick wall seamless steel pipe units. The large diameter thick wall seamless steel pipe is mainly based on the external diameter of its steel pipe. Generally, the outer diameter of the steel pipe is above 325 mm, we call it large diameter steel pipe. The thick wall, the thickness of the wall is above 20 mm, it is OK.

The manufacturing process of steel pipe is as follows:

The raw material of steel pipe is steel pipe billet, which is cut and processed by a cutting machine to a billet with a length of about 1 meter, and sent to the furnace by conveyor belt for heating. The temperature is about 1200℃. The fuel is hydrogen or acetylene. The control of temperature in the furnace is the key problem. The circular pipe blank should be pierced through the pressure punch after coming out. Generally more common punch is the conical roller punch, this punch has high production efficiency, good product quality, large diameter expansion perforation, can wear a variety of steel. After perforation, the circular pipe billet is successively three - roll oblique rolling, continuous rolling or extrusion. After extrusion, the diameter should be taken out of the pipe. The sizing machine rotates the steel embryo through the cone bit at high speed to punch holes and form steel pipes. The inner diameter of the steel pipe is determined by the outer diameter length of the bit of the sizing machine. Steel pipe after sizing, into the cooling tower, through water cooling, steel pipe after cooling, will be straightened. After straightening, the steel pipe is sent by the conveyor belt to the metal inspection machine (or hydrostatic test) for internal inspection. If there are cracks, bubbles and other problems inside the steel pipe, it will be detected. After the quality inspection of steel pipes, they have to pass strict manual selection (now there are laser detection inspection).

Development status of large diameter seamless steel pipe:

Along with the development of the iron and steel industry, for the pipeline industry has been more and more are derived from the type, now let's say is one kind of large diameter steel pipe, now in our life are more and more use of large diameter steel pipe, applied in a lot of, what we call the large diameter steel pipe is a kind of special hollow cross section of pipe, It is precisely because of this special design that this kind of pipe has a lot of expansion in our life application. Especially in our shipbuilding and construction industries, but also in aviation. The main role of galvanizing is to improve the service life and corrosion performance of the square pipe, which also makes the performance of large diameter steel pipe further improved, and the good than bad galvanized layer is directly affecting our large diameter steel pipe and large diameter steel pipe price. If you want to improve the large diameter steel pipe, it is necessary to reduce the zinc slag to reduce the content of iron in zinc liquid, which is to reduce the factors of iron dissolution. In order to form an excellent galvanized layer on the surface of our large diameter steel pipe, it is also because of this that our large diameter steel pipe manufacturers have a large direction to transform this kind of pipe.

For large mouth diametert seamless steel pipe manufacturers, because of capital and cost factors, it has been difficult to have a subjective will to carry out pollution treatment enterprises, the environmental inspection and standard of the new is an opportunity. Only in the game of breaking and standing, the adjustment of giving up and gaining, holding back the pain and unswervingly promoting the elimination of backward production capacity, can enterprises achieve the transformation and upgrading in this environmental storm, and then promote the sustainable development of the whole industry.