Seamless steel pipes are made of a single piece of metal and have no seams on the surface. They are called seamless steel pipes. According to the production method, seamless tubes are divided into hot rolled tubes, cold rolled tubes, cold drawn tubes, extruded tubes, and jacked tubes. According to the cross-sectional shape, seamless steel tubes are divided into two types: round and special. The special-shaped tubes have various complex shapes such as square, oval, triangle, hexagon, melon, star, and finned tube.
A572GR is divided into five grades: grade 42, grade 50, Grade 55 for riveting, bolted or welded structural parts; Grade 60 and 65 for riveting and bolted structural parts for bridge or other purposes.
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