In order to satisfy the ever demanding requirement of the pipelines that are used in the API 5L steel pipe in modern industries, more and more pipeline production companies are researching and developing various kinds of high-performance steel pipes. Here lists some of them for your reference.
1.Steel pipes with high strength and high anti-deformability
The installation environment of the high strength pipeline steel varies continuously and dramatically from plain to earthquake area or frozen soil area. Thus, in addition to the high strength, the anti-deformability is another requirement and sometimes a must under certain circumstances. But generally, the higher level of strength means the lower level of anti-deformability capacity. As a result, the application of high strength steel is limited such as X100.
2. high strength pipeline steel and acid fastness
In acid environment, the API steel pipe that used should be with high flexibility and acid fastness. X65 is this kind of pipe developed by a Japanese company. They add Nb and Mo into the steel to ensure the strength and at the same time, they refine the crystal particle to enhance the flexibility in low temperature.
3.Steel pipes with high strength and excellent HAZ tenacity
In order to satisfy the requirement of the field welding, high strength steel pipelines that are used in API steel pipe need excellent weldability and HAZ tenacity. And the best way to enhance HAZ tenacity is to refine its crystal particle.
4.Steel pipes with thick wall
Poor conditions of the marine environments put forward even stricter request for the quality of the submerged pipeline and accordingly the steel to make the pipe. The submerged pipeline which can be used in API steel pipe demands not only the transverse strength but also the longitudinal strength. As marine petroleum exploitation extends from the coastal waters to abysmal sea, the importance of pressure resistance become even higher. Many companies did a lot of research in this area and developed successfully the high pressure-resistance steel pipes such as X65, X75 with thick wall, which are widely used in submerged pipeline installation.
