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Integral heavy weight drill pipe is the transition zone between drill collar and drill pipe. It can not only reduce stress-formation in the connection of drill collar and drill pipe, but also reduce the wear on OD.

ASTM A192/ASME SA192: Seamless Carbon Steel Boiler Tubes for High-Pressure ServiceStandard: ASTM A192/ASME SA192

ASTM A500 straight seam submerged arc welded steel pipe is a straight seam steel pipe manufactured using the submerged arc welding process, and its standard complies with ASTM A500.

Seamless steel tube used in machining is one of the most commonly used types of seamless steel tube.Seamless steel pipe has hollow section, no weld from top to bottom.