china black hollow section welded steel pipe

China Black Hollow Section Manufacturers, Suppliers ...Black hollow section are non-galvanized steel pipes. Black hollow section, its name comes from the scal ...

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china black hollow section welded steel pipe

Description: China Black Hollow Section Manufacturers, Suppliers ...Black hollow section are non-galvanized steel pipes. Black hollow section, its name comes from the scaly, dark-colored iron oxide coating on its surface. It’s used in applications that don’t require galvanized steel. They connected by screwing onto the threaded pipe, after apply ...

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