The seamless steel pipe is made of a hair tube with a steel ingot or solid tube, and then made by hot rolling, cold rolling or cold.
The seamless steel pipe has a hollow section and a large number of pipes for transporting fluids.
Compared with solid steel such as steel pipes and round steel, when the anti -bending and anti -twist strength strength is the same, the weight is light. It is an economic section steel. It is widely used in manufacturing structures and mechanical parts, such as steel scaffolding of petroleum diamonds.
Seamless steel pipe development history
Seamless steel pipe production has a history of nearly 100 years.
The Germans Mannman brothers first invented the two -roller oblique rolling perforation machine in 1885. In 1891, the cycle rolling machine was invented. Pipe machine), a variety of extended machines such as continuous pipe rolling machines and top pipe machines appeared in the future, and began to form a modern seamless steel pipe industry.
In the 1930s, the quality of the steel pipe was improved due to the use of a three -roller rolling machine, extrusion machine, and cyclical cold rolling pipe machine.
Due to the improvement of the rolling machine in the 1960s, the emergence of the three -roller piercing machine, especially the success of the application tension, and the success of the continuous casting.
In the 1970s, seamless pipes and welded pipes were driving together, and the output of world steel pipes increased at a rate of more than 5 % per year. After 1953, China attached great importance to the development of seamless steel pipe industry, and it has initially formed a production system for rolling various large, medium and small pipes.
Copper pipes are generally used in ingots diagonal rolling, rolling tube rolling machines, and stretching processes.
The purpose and classification of seamless steel pipes
Uses: Seamless steel pipes are a kind of economic section steel, which has a very important position in the national economy. It is widely used in petroleum, chemical industry, boilers, power stations, ships, machinery manufacturing, automobiles, aerospace, energy, geology, construction and construction and construction and construction and construction and construction and construction and construction and construction and construction and construction and construction and construction. Military industry and other departments.
Classification:
① According to the shape of the section: circular section tube, alien section tube
② According to the material: carbon steel pipe, alloy steel pipe, stainless steel pipe, composite pipe
③ Divided by connection: thread connection tube, welding tube
④ According to the production method: hot rolling (squeezing, top, expansion) tube, cold rolling (pull) tube
⑤ According to use: boiler tube, oil well pipe, pipeline tube, structural tube, chemical tube
