Seamless steel pipe is a round, square, or rectangular steel material with a hollow cross-section and no seams around it. Seamless steel pipes are made from steel ingots or solid tube blanks that are perforated into capillary tubes, and then hot rolled, cold rolled or cold drawn.
Seamless steel pipe is a round, square, or rectangular steel material with a hollow cross-section and no seams around it. Seamless steel pipes are made from steel ingots or solid tube blanks that are perforated into capillary tubes, and then hot rolled, cold rolled or cold drawn.
Seamless steel pipe production has a history of nearly 100 years. The German Mannesmann brothers first invented the two-roller cross-rolling piercing machine in 1885 and the cycle pipe rolling machine in 1891. In 1903, the Swiss R.C. Stiefel invented the automatic pipe rolling machine (also known as the top rolling machine). pipe machine), and later various stretching machines such as continuous pipe rolling machines and pipe jacking machines appeared, and the modern seamless steel pipe industry began to form. In the 1930s, the three-roller pipe rolling machine was adopted.
Extruders and periodic cold-rolled pipe machines have improved the variety and quality of steel pipes. In the 1960s, due to the improvement of continuous pipe rolling machines and the emergence of three-roll piercing machines, especially the success of applying tension reducers and continuous casting billets, production efficiency was improved and the ability of seamless pipes to compete with welded pipes was enhanced.
In the 1970s, seamless pipes and welded pipes were keeping pace with each other, and world steel pipe production was increasing at a rate of more than 5% per year. After 1953, China attached great 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 also generally use ingot cross-rolling and perforation, pipe rolling machine rolling, and coil drawing processes.
