oil spiral welded pipe production features

Oil spiral welded pipe is a kind of mechanical product area in the seamless pipe bars or plates according to deep processing like pressure, welding, heat treatment and surface treatment etc. In order to meet use requirement, it is strict with the mechanical properties, metallurgical quality and mechanical parts together with outside diameter, inside diameter, wall thickness, roundness, sealing performance and structural integrity of the finished products.

The Production Characteristics of Oil Spiral Welded Pipe
The production is different between oil spiral welded pipe and other spiral welded pipe. An important feature is that the oil pipeline production adopts thermo-mechanical treatment. Also it is a key method to enhance mechanical properties of oil pipeline. The thermo-mechanical treatment is to make steel and alloy plastic deformation under the state of austenite, and then to quench before waiting deformation austenite produces recrystallization. It is important to control the deformation and the finishing temperature for hot rolling oil pipeline. The temperature of the reducing mill is above 850℃ (the steel organization is still in a state of austenite.), if after the reducing, spray quenching device carries out the rapid cooling and quenching to the spiral steel pipe, this will complete thermo-mechanical treatment process.



However, oil spiral steel pipe thermo-mechanical treatment still meets some shortcomings in the process. For example, spiral steel pipe will cause pipe section charge, bending and unequal organization performance, due to uneven temperature on the surface or uneven cooling. This problem is yet to be further studied.