People treat this two-phase structure composed of a specific ratio as a kind of organization and named it pearlite. This kind of steel is called eutectoid steel. That is, steel with a carbon content of exactly 0.77% is called eutectoid steel, and its structure is pearlite.　

The precision steel pipe has high dimensional accuracy and high finish, the inner and outer surfaces of the pipe have no oxide film after heat treatment.

Large-caliber coated steel pipes are widely used in engineering fields such as tap water, natural gas, petroleum, chemicals, medicine, communications, electric power, and oceans.

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.