06-25 2026 
HR sheet is uncoated hot rolled steel, while GP sheet is zinc-coated galvanized plain steel. Learn how they differ in finish, corrosion resistance, forming, welding, and cost.
“Super-Large Seamless Pipe Unit” (Project 630) We witnessed the launch of the extra-large diameter continuous pipe rolling unit (industry-known as the “Super-Large Seamless Pipe Unit” or “Project 630”). Key Parameters: The world’s first continuous rolling line for seamless pipes featuring the largest diameter and a three-roll retained mandrel system; outer diameter (OD) range of Φ323.8–630mm, […]
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