Seamless Steel Pipe Raw Material - Round Billet

Seamless Steel Pipe Raw Material - Round Billet

Seamless Steel Pipe is made from a solid round steel 'billet' which is heated and pushed or pulled over a form until the steel is shaped into a hollow tube. Billets are procured both from indigenous suppliers and from abroad. In Seamless pipe, there are no welding or joints and is manufactured from solid round billets. The seamless pipe is finished to dimensional and wall thickness specifications in sizes from 1/8 inch to 26 inch OD. Applicable in for High-pressure applications such as Hydrocarbon Industries & Refineries, Oil & Gas Exploration & Drilling, Oil & Gas Transportation and Air and Hydraulic cylinders, Bearings, Boilers, Automobiles.

The continuous casting method produces round billets mainly for the production of seamless steel tubes of different calibers. The round billet perforation relies on two inclined rollers to rotate the round billet, and advances the perforation toward the head end mounted on the end of the mandrel. The perforated inner surface becomes the inner wall of the steel pipe, which is a very harsh processing method. The requirements for round billet quality are:

Good center density and low magnification structure of the round billet. If there is looseness or crack in the center of the round billet, crack marks will be left on the inner surface of the tube wall; the density of the loose area is different from the density at the surface (such as 0.003~0.005g/cm3), and the internal cracked waste will be produced when the tube is worn.

The round billet should have a good surface quality. If there is a skin pinhole or slag inclusion, tearing is likely to occur when the pipe is worn, and cracks are formed through the surface.

Round billet purity. The inclusions within 13 mm of the round billet and the inclusion of large internal particles are the main cause of crack defects in the pipe. The inclusions in the slab were < 0.035%, and the waste was significantly reduced.

When the internal crack of the round billet is serious, the pipe can not be welded.

Ellipticity of the round billet. Uneven shrinkage of the shell caused by uneven cooling is easy to produce elliptical deformation.