HS Code for Large diameter steel casing

Large diameter steel casing is classified under HS code 730520. This code is specifically reserved for iron or steel tubes and pipes that are not seamless, have a circular cross-section, and possess an external diameter exceeding 406.4mm. Furthermore, the product must be specifically designed as "casing" of a kind used in drilling for oil or gas. The classification under heading 7305 (as opposed to 7304 or 7306) is dictated by the combination of the large external diameter and the manufacturing method (welded or riveted). These pipes are critical infrastructure components in the energy sector, designed to withstand high pressure and protect the structural integrity of oil and gas wells during extraction processes.

Products Included

• Welded steel casing (>406.4mm diameter)
• Submerged arc welded (SAW) casing for oil/gas wells
• Large diameter longitudinal welded casing
• Spiral welded steel casing for drilling applications

Common Misclassification

This product is often misclassified under HS code 730422 or 730424, which are for seamless casing. If the pipe has no weld seam, it must go in 7304 regardless of diameter. Another common error is using HS code 730511 or 730512, which are for "line pipe" used for oil or gas pipelines. While casing and line pipe look similar, casing is used inside the wellbore, whereas line pipe is used for transport; they are distinct categories in the HS system.

FAQ

What is the HS code for large diameter steel casing?

The HS code for non-seamless steel casing with an external diameter exceeding 406.4mm used in oil or gas drilling is 7305.20.

What if the diameter is less than 406.4mm?

If the external diameter is 406.4mm or less and the pipe is welded, it would be classified under HS code 7306.29.