Round Tubing

Cold Drawn Seamless (CDS): This is created through a process where a hot rolled bar is pierced to produce both OD and ID dimensions. Generally presented in its "as drawn" state, CDS boasts superior surface quality and enhanced mechanical properties compared to hot finished seamless tubing. Constructed from 1026-grade steel, it aligns with ASTM A519.

Drawn Over Mandrel (DOM): DOM tubing is characterized by minimal wall variation and an absence of spiraling eccentricity. This tube is shaped and welded from strip steel that exhibits little gauge discrepancy. Afterwards, it's cold drawn to its required size, making the weld seam almost invisible. For tubing that's 10 ga and lighter, 1020-grade steel is used, while for those heavier than 10 ga, 1026-grade steel is employed. This conforms to ASTM A513 Type 5 (mandrel drawn).

Advantages of DOM Tubing:

• Enhanced wall thickness uniformity
• Superior surface finish
• Reduced stock removal
• Absence of spiral on ID
• Denser ID surface
• Precision in tolerance
• Cost-effectiveness in comparison or even lower costs

Electric Resistance Welded Tubes: These tubes are made from either cold rolled or hot rolled scale-free strips. These strips are formed into a tubular shape at room temperature via rolls. The welding process involves heating the two edges of the strip using an electric current as they are compressed together. During this process, only a thin band of the metal is heated, keeping the rest of the tube cool. The exterior weld flash is consistently trimmed off, and using specialized tools, the inner flash can also be removed.