What kinds of steel pipes are there?

Answer; The types of steel pipes include the classification of precision steel pipes, alloy steel pipes (1) and production methods (1). Seamless pipes: heat pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes and pipe jacking (2). Welded pipe (A) is divided into arc welded pipe, resistance welded pipe (high frequency and low frequency), gas welded pipe and furnace welded pipe according to the process. (b) According to welding seam: straight welded pipe and spiral welded pipe. 2. Steel pipes with simple section are classified according to the section shape (1): round steel pipes, square steel pipes, oval steel pipes, triangular steel pipes, hexagonal steel pipes, rhombic steel pipes, octagonal steel pipes, semicircular steel rings and others. (2) Steel pipes with complex sections: equilateral hexagonal steel pipes, five-petal plum-blossom steel pipes, biconvex steel pipes, biconvex steel pipes, melon seeds steel pipes, conical steel pipes, corrugated steel pipes, watchcase steel pipes, etc. 3. Classification by wall thickness: thin-walled steel pipe and thick-walled steel pipe. 4. Classification by use: steel pipes for pipelines, thermal equipment, machinery industry, petroleum, geological drilling, containers, chemicals, special-purpose steel pipes, special-purpose steel pipes and special-purpose steel pipes.

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Seamless precision pipe, also known as welded pipe, is a steel pipe made of steel plate or steel strip after crimping. Welded steel pipe has simple production process, high production efficiency, many varieties and specifications and few equipment, but its strength is generally lower than that of seamless steel pipe. Since 1930s, with the rapid development of high-quality strip continuous rolling production and the progress of welding and inspection technology, the weld quality has been continuously improved, and the varieties and specifications of welded steel pipes have been continuously increased, replacing seamless steel pipes in more and more fields. Welded steel pipes are divided into straight welded pipes and spiral welded pipes according to the weld forms.

The production process of straight welded pipe is simple, with high production efficiency, low cost and rapid development. The strength of spiral welded pipe is generally higher than that of straight welded pipe. Welded pipes with larger diameters can be produced from narrow blanks, and welded pipes with different diameters can also be produced from blanks with the same width. However, compared with the straight seam pipe with the same length, the weld length increases by 30~ 100%, and the production speed is lower.