The seamless steel pipe is a circular, square, rectangular steel with a hollow section and no seams around it. The seamless steel pipe is formed by perforating a steel ingot or a solid tube blank, and then hot rolled, cold rolled or cold drawn. The seamless steel pipe has a hollow section and is used as a pipe for conveying fluid. Compared with a solid steel such as round steel, the steel pipe is light in weight when it has the same bending and torsional strength, and is an economical section steel, steel pipe supplier which is widely used in manufacturing structures. Parts and mechanical parts, such as steel scaffolding for oil drills.
Seamless steel pipe production has a history of nearly 100 years.
The German Mannesmann brothers first invented the two-roll cross-rolling piercing machine in 1885. In 1891, the cycle rolling mill was invented. In 1903, the Swiss Ritteriefel invented the automatic pipe rolling machine (also called the head rolling). Pipe machine), and later appeared various types of extension machines such as continuous tube rolling mills and pipe jacking machines, and began to form a modern seamless steel pipe industry.
In the 1930s, the quality of the steel pipe was improved by the use of a three-roll mill, an extruder, and a periodic cold-rolled pipe mill. In the 1960s, due to the improvement of continuous rolling mills, the emergence of three-roll punching machines, especially the application of tension reducing machines and continuous casting blanks, increased production efficiency and enhanced the ability of seamless pipes to compete with welded pipes. In the 1970s, seamless pipes and welded pipes were moving in parallel, and the world’s steel pipe production increased at a rate of more than 5% per year.
After 1953, China attached importance to the development of seamless steel pipe industry, and has initially formed a production system for rolling various large, medium and small pipes. Copper pipes are generally also used in the ingot blank rolling piercing, rolling mill rolling, coil stretching process.
Uses: Seamless steel pipe is an economical section steel, which has a very important position in the national economy. It is widely used in petroleum, chemical, boiler, power station, shipbuilding, machinery manufacturing, automobile, aviation, aerospace, energy, geology, construction and Military and other departments.