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.

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ASTM A672 is the standard for electrofusion welded (EFW) pipe for carbon steel. This type of steel pipe is primarily used in high temperature and high pressure applications such as the oil and gas industry.