Seamless steel pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section, used mainly to convey substances that can flow — liquids and gases (fluids), slurries, powders and masses of small solids.
Seamless Pipe (and tubing) is made by extruding a steel block or by drilling a solid steel bar. Next, the extrusion or the drilled steel bar is cold drawn through a dye to achieve the diameter and thickness needed. Because this process can cause mechanical hardening, sometimes the material is annealed and straightened as a final process. Seamless Pipe & Tubing is subdivided as:
Cold Drawn Seamless, or CDS, exhibits precise tolerances and a good surface finish.
Hot Finished Seamless or HFS has less critical tolerances and a somewhat scaly finish and is not as strong as CDS.
For Drawn over Mandrel, or DOM tubing, the first stages of manufacturing are identical to the ones used to make electric resistance welded tubing, but in the finishing stages the entire flash weld is taken out and the tube is cold drawn over a mandrel. A mandrel is a round object against which material can be forged or shaped. The cold-drawn process provides the tube with better dimensional tolerances, improved surface finish and the strongest weld strength achievable.
ASTM A333 is a standard specification for seamless and welded steel pipe for low-temperature service. The material grades covered by this specification include Grade 1, Grade 3, Grade 4, Grade 6, Grade 7, Grade 8, Grade 9, Grade 10, and Grade 11. These pipes are commonly used in the construction of power plants, refineries, and other low-temperature applications where piping systems must operate at temperatures lower than -45 degrees Celsius. The ASTM A333 specification covers both seamless and welded steel pipe, and it includes various chemical and mechanical tests to ensure that the pipes meet the required specifications.
ASTM A333: American Society for Testing and Materials
Seamless Steel Pipe for Low-Temperature Service
Application: Oil, Gas and water delivery; Refinery, Boiler and Mechanical equipment manufacturer; structure construction; drilling, ship building and etc.
Rich production technology, advanced equipment, high automation degree and high production precision, complete molding. As the designated supplier of major energy enterprise groups under the jurisdiction of SASAC, the company has won a number of national and provincial reputations.