the different using purpose guidance of welded steel pipewelded steel pipes are generally divided into general welded pipe, oxygen welding tube, galvanized welded pipe, metric system welded tube, transformer tube as well as spiral welded pipe etc.
With different using purpose, there are some guidance of different welded steel pipe as following.
General Welded Pipe
General welded pipe uses Q195A, Q215A and Q235A or mild steel as raw materials. Mild steel also known as plain carbon steel, is the most common form of steel because its price is relatively low and material properties that are acceptable for many applications. Therefore, it is used in transferring the low pressure fluid. Moreover, the pipes need water pressure, bending and flattening test etc. to guarantee the quality. Often, it has some certain requirements on the surface quality. The length of delivery is often from 4 to 10m, the welded pipe specifications in nominal diameter are different from actual size.
Galvanized Welded Pipe
Generally speaking, in order to enhance the corrosion resistance, the general welded pipe is galvanized zinc as protective layer on surface. Galvanized steel pipe has two types: hot dip galvanized pipe with thicken zinc layer and electrical galvanized pipe with low cost.
Metric System Welded Tube
The metric system welded tube is manufactured by the common carbon steel, quality carbon steel or low alloy steel with hot and cold welding. The specification adopts the seamless steel pipe form with outside diameter and wall thickness (mm). The common metric system welded tube is usually used in structural elements such as axis of rotation or transportation the fluid etc. The thin-walled tube is utilized for processing furniture, lamps and lanterns. But the manufacturers need to ensure the strength and bending of steel pipe in the processing.
Spiral Welded Tube
The spiral welded tube adopts low carbon structural steel or low alloy structural steel strip depending on certain helix angle (forming angle) rolled into a tube billet, then welded the pipe joints to be made. The spiral welded tube can use narrow strip steel to process large diameter steel pipe. So it is broadly applied as oil or natural gas pipeline transportation projects. Furthermore, spiral welded steel pipe has one side welding and double sided welding.
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