Large Diameter Seamless Pipes: A Guide for Buyers

 

Introduction:
Large diameter seamless pipes, those over 16 or 20 inches, are not produced solely by hot rolling. They require an additional process called hot expanding to achieve their larger sizes efficiently and at a lower cost. This method has become popular in modern pipe manufacturing.
Hot Expanding Process:
Also known as thermal expansion, the hot expanding process involves heating the pipe to a temperature near its transformation point. It is then expanded using methods like corner skew rolling or hot drawing to increase its diameter.
Things to Consider Before Buying:
When purchasing large diameter seamless pipes, understanding their characteristics is crucial for ensuring quality.
1. Seamless Construction:
Ensure the pipe has no weld seams. Some unscrupulous manufacturers may attempt to remove seams invisibly. Watch out for these fake products.
2. Roundness and Uniformity:
Check for the roundness of the pipe. Welded pipes often have an irregular shape due to the welding process, whereas seamless pipes offer a consistent round cross-section suitable for various construction applications.
3. Pressure-bearing Capacity:
Seamless pipes can withstand greater pressure than welded pipes. They may be more expensive, but their strength and reliability under pressure make them a worthy investment.
4. Durability in Harsh Conditions:
Large diameter seamless pipes can withstand extreme temperatures, making them suitable for challenging environments where welded pipes may fail.
Cost Considerations:
The price of hot expanded seamless pipes is lower than standard hot rolled pipes due to reduced steel density. However, it is higher than large welded pipes like SSAW and LSAW.
Conclusion:
Despite the higher initial cost, the enhanced performance and benefits of large diameter seamless pipes make them suitable for a wide range of applications. They are increasingly important in commercial pipelines, oil rigs, ship building, offshore rigs, machinery parts, pressure vessels, and oil field equipment.

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