All openings on both ends and has a hollow section, and its length and cross section Zhou Chang zhi larger steel, can be referred to as the steel pipe.

   When the length and cross section Zhou Chang zhi is small, can be called a section or tubular parts, they are all belong to the category of pipe products.Steel pipe is a kind of economic cross section steel, is an important product of iron and steel industry, usually account for around 8% of the total amount of steel ~ %, its application range is very wide in the national economy.

    Because the steel pipe has a hollow section, and thus the most suitable for liquid, gas and solid pipeline;At the same time, compared with the same weight of round steel, steel pipe section coefficient, bending torsional strength, so all kinds of mechanical and architectural structure have become the important material.Made of steel structure and components, in under the condition of equal weight, than the solid parts has a larger section modulus.

       So, steel pipe itself is a kind of metal saving economic cross section steel, it is an important component of efficient steel, especially in the oil drilling, refining and transportation and other industries demand is bigger, the second geological drilling, chemical industry, building industry, industrial machinery, aircraft and automobile manufacture and boiler and bicycle manufacturing, medical equipment, furniture, etc are also requires a lot of all kinds of steel pipe.In recent years, with the atomic energy, rocket, missile and space industry, development of new technology, such as steel pipe in the defense industry, the status of science and technology and economic development more and more important.