Large diameter steel pipe plays an important role in oil and gas transmissions. It used a lot for long distances pipeline projects, since it could carry more liquid and with big flow rate.

Plastic-coated composite steel pipes are also called plastic-coated steel pipes. Plastic-coated steel pipes are based on steel pipes and use plastic powder as the coating material. The inner surface is melt-coated with a plastic layer, and the outer surface is coated with a plastic layer. Or steel-plastic composite products with anti-corrosion layer of other materials. This product is a newly deve...

Seamless steel pipes are represented by outer diameter and wall thickness. Thick-walled seamless steel pipes are mainly used for mechanical processing, coal mines, hydraulic steel and other purposes.

Thin-walled seamless steel pipes are made of steel ingots or solid tube blanks through perforation to make capillary tubes, and then hot-rolled, cold-rolled or cold-rolled.

According to the different strength requirements, the petroleum cracking pipe can adopt several heat treatment methods such as normalization, normalization plus fire and quenching and tempering (quenching and tempering).

The key to the uneven wall thickness of the hot-rolled tube is the one-time hole in the hot rolling. The uneven wall thickness of the capillary hole is likely to be caused by the following three factors.