Cross is also a type of steel pipe fitting, which can be divided to equal and reduced. Equal cross has same diameters at the four pipe ends and and for reduced cross the diameters of main pipes are same but the diameters of branch pipes are smaller than main pipes.

Cross is a kind of pipe fitting used at the branches of a pipeline. For the cross produced by seamless steel pipes, currently the common processes are two varieties: hydraulic expansion and hot forming.

Hydraulic expansion of cross is a forming process in which branch pipes are expanded by axial compensation of steel pipes. Hot press moulding cross is to take the pipe blanks with a little bigger diameters than the cross diameter then heating and pressing them in the moulds to form crosses.

The cross is similar to tee but it only has specifications in the standard ASME B16.9. In other standards there is no technical datas about it. So generally for cross only classified two types equal and reducing.

Carbon steel butt weld cross is generally made of carbon steel pipes or carbon steel plates. This kind of material commonly is not applied to special purpose, so these crosses usually are for middle and low pipelines at normal temperature.

Alloy steel butt weld cross, its mother materials are alloy steel pipes or steel plates that are specially used for the pipelines taken at high temperature and high pressure. An alloy steel pipe cross also has the feature of high strength.

Stainless steel butt weld cross, just as its name implies the raw materials are corrosion-resistance. The common materials refer to 304/304L, 316/316L, 321/321L etc. This kind of pipe crosses are often put in the pipelines of corrosion fluid.