Steel grade: Q235B, Q345B, L245, L290 Specification: 219mm-3600mm Implementation standard: SY5037-2012 Quality grade: Ministry standard Application: Spiral pipes are mainly used in water supply projects, petrochemical industry, chemical industry, power industry, agricultural irrigation, and urban construction. They are one of the 20 key products developed in my country. For liquid transportation: water supply, drainage, sewage treatment projects, mud transportation, and marine water transportation. For gas transportation: coal gas, steam, liquefied petroleum gas. For structural use: pile pipes, bridges; pipes for docks, roads, building structures, marine pile pipes, etc.