3PE anti-corrosion steel pipe refers to a 3-layer structure polyolefin coating (MAPEC) external anti-corrosion steel pipe.

Directly buried insulated steel pipes are composed of three layers: inner steel pipe, polyurethane foam layer and outer protective pipe.

There are three connection methods for spiral steel pipes: flange connection, welded connection and threaded connection.

Welded steel pipes and seamless steel pipes are both commonly used pipe materials, and they have different characteristics in use.

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JIS G3461 STB 510 is a Japanese Industrial Standard (JIS) specification for seamless carbon steel tubes used in boiler and heat exchanger applications.