When the seamless pipe is installed and put into operation, it often expands and contracts due to the difference between the temperature of the medium in the pipe and the ambient temperature during installation.

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