How Much Do You Know About Seamless Pipes?

Seamless steel pipe is a kind of round, square and rectangular steel with hollow sections and no joints around. Seamless steel pipes are made of steel ingots or solid billets through perforation, and then hot rolled, cold rolled or cold drawn. Seamless steel pipe has a hollow section, which is widely used as a pipeline for conveying fluid. Compared with solid steel such as round steel, the steel pipe has the same bending and torsional strength, and its weight is lighter. It is the economic section of steel, which is widely used to manufacture structural parts and mechanical parts

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The production process of seamless steel pipe

① Main production process (main inspection process) of hot rolled seamless steel pipe:

Preparation and inspection of pipe blank → heating of pipe blank → piercing → pipe rolling → reheating of raw pipe → sizing (reducing) → heat treatment → straightening of finished pipe → finishing → inspection (non-destructive, physical and chemical, bench test) → warehousing

② Main production process of cold-rolled (drawn) seamless steel pipe

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

Application and classification of seamless steel pipe

Application: seamless steel pipe is a kind of economic section steel, which plays a very important role in the national economy. It is widely used in petroleum, chemical industry, boiler, power station, ship, machinery manufacturing, automobile, aviation, aerospace, energy, geology, construction, military industry, and other departments.

Classification:

① Divided by section shape: circular section pipe and special-shaped section pipe

② By material: carbon steel pipe, alloy steel pipe, stainless steel pipe, and composite pipe

③ According to the connection mode: threaded connection pipe and welded pipe

④ By production mode: hot-rolled (extruded, jacked, and expanded) pipe, cold-rolled (drawn) pipe

⑤ By use: boiler pipe, oil well pipe, pipeline pipe, structural pipe, fertilizer pipe

Development History of Seamless Steel Pipe

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Seamless steel pipe production has a history of nearly 100 years. The German Mannesmann brothers first invented the two roll cross rolling piercer in 1885 and the periodic pipe mill in 1891. In 1903, the Swiss r.c.stiefel invented the automatic pipe mill (also known as the top pipe mill). After that, various extension mills such as the continuous pipe mill and the top pipe mill appeared, which began to form the modern seamless steel pipe industry.

In the 1930s, due to the adoption of three roll pipe rolling mill, extruder, and periodic cold rolling mill, the variety, and quality of steel pipes were improved. In the 1960s, due to the improvement of continuous pipe mill, the emergence of three roll piercer, especially the successful application of stretch reducing mill and continuous casting billet, improved the production efficiency and enhanced the competitiveness between seamless and welded pipes. In the 1970s, seamless pipe and welded pipe were going hand in hand, and the world steel pipe output was increasing at a rate of more than 5% per year.

Since 1953, China has attached great importance to the development of the seamless steel pipe industry and has initially formed a production system for rolling various large, medium, and small pipes.

Steel pipes are long, hollow tubes that are used for a variety of purposes. They are produced by two distinct methods which result in either a welded or seamless pipe. In both methods, raw steel is first cast into a more workable starting form. It is then made into a pipe by stretching the steel out into a seamless tube or forcing the edges together and sealing them with a weld. The first methods for producing steel pipe were introduced in the early 1800s, and they have steadily evolved into the modern processes we use today. Each year, millions of tons of steel pipe are produced. Its versatility makes it the most often used product produced by the steel industry.

History

People have used pipes for thousands of years. Perhaps the first use was by ancient agriculturalists who diverted water from streams and rivers into their fields. Archaeological evidence suggests that the Chinese used reed pipe for transporting water to desired locations as early as 2000 B.C. Clay tubes that were used by other ancient civilizations have been discovered. During the first century A.D, the first lead pipes were constructed in Europe. In tropical countries, bamboo tubes were used to transport water. Colonial Americans used wood for a similar purpose. In 1652, the first waterworks was made in Boston using hollow logs.

Development of the modern day welded steel pipe can be traced back to the early 1800s. In 1815, William Murdock invented a coal burning lamp system. To fit the entire city of London with these lights, Murdock joined together the barrels from discarded muskets. He used this continuous pipeline to transport the coal gas. When his lighting system proved successful a greater demand was created for long metal tubes. To produce enough tubes to meet this demand, a variety of inventors set to work on developing new pipe making processes

An early notable method for producing metal tubes quickly and inexpensively was patented by James Russell in 1824. In his method, tubes were created by joining together opposite edges of a flat iron strip. The metal was first heated until it was malleable. Using a drop hammer, the edges folded together and welded. The pipe was finished by passing it through a groove and rolling mill.

Russell’s method was not used long because in the next year, Comelius Whitehouse developed a better method for making metal tubes. This process, called the butt-weld process is the basis for our current pipe-making procedures. In his method, thin sheets of iron were heated and drawn through a cone-shaped opening. As the metal went through the opening, its edges curled up and created a pipe shape. The two ends were welded together to finish the pipe. The first manufacturing plant to use

Welded pipe is formed by rolling steel strips through a series of grooved rollers that mold the material into a circular shape. Next, the unwedded pipe passes by welding electrodes. These devices seal the two ends of the pipe together.

Welded pipe is formed by rolling steel strips through a series of grooved rollers that mold the material into a circular shape. Next, the unwedded pipe passes by welding electrodes. These devices seal the two ends of the pipe together.

This process in the United States was opened in 1832 in Philadelphia.

Gradually, improvements were made in the Whitehouse method. One of the most important innovations was introduced by John Moon in 1911. He suggested the continuous process method in which a manufacturing plant could produce pipe in an unending stream. He built machinery for this specific purpose and many pipe manufacturing facilities adopted it.

While the welded tube processes were being developed, a need for seamless metal pipes arouses. Seamless pipes are those which do not have a welded seam. They were first made by drilling a hole through the center of a solid cylinder. This method was developed during the late 1800s. These types of pipes were perfect for bicycle frames because they have thin walls, are lightweight but are strong. In 1895, the first plant to produce seamless tubes was built. As bicycle manufacturing gave way to auto manufacturing, seamless tubes were still needed for gasoline and oil lines. This demand was made even greater as larger oil deposits were found.

As early as 1840, ironworkers could already produce seamless tubes. In one method, a hole was drilled through a solid metal, round billet. The billet was then heated and drawn through a series of dies which elongated it to form a pipe. This method was inefficient because it was difficult to drill the hole in the center. This resulted in an uneven pipe with one side being thicker than the other. In 1888, an improved method was awarded a patent. In this process the solid billed was cast around a fireproof brick core. When it was cooled, the brick was removed leaving a hole in the middle. Since then new roller techniques have replaced these methods.

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