The line pipe is a pipeline that transports the oil, gas or water extracted from the ground to the oil and gas industry enterprises through the line pipe. Line pipes include seamless pipes and welded pipes. The pipe ends include flat ends, threaded ends and socket ends; the connection methods are end welding, coupling connection, socket connection, etc.

The seamless steel pipe for ships refers to the special seamless steel pipe in the shipbuilding process.

Chemical composition analysis: chemical analysis method, instrumental analysis method

SSAW steel pipes should be tested for mechanical properties, flattening and flaring before leaving the factory, and should meet the requirements of the specification rules. The quality inspection methods are as follows:

LSAW steel pipe expansion is a pressure processing process that uses hydraulic or mechanical means to apply force from the inner wall of the steel pipe to expand the steel pipe radially outward. The mechanical method is simpler and more efficient than the hydraulic method, and the steel pipe machining is more accurate under the condition of high precision

ERW steel pipe is abbreviated as ERW for straight seam electric resistance welded pipe. It is used to transport oil, natural gas and other vapor-liquid objects. It can meet various requirements of high and low pressure. At present, it occupies a pivotal position in the field of transportation pipes in the world.