The ellipticity of seamless carbon steel pipes is inevitable in the production process, but it can be reduced. If the ellipticity is large, it will bring a lot of trouble in the construction. Ovality refers to the misalignment of the steel strip in the rolling process due to the low precision of the equipment during the forming process of the seamless carbon steel pipes. Therefore, it is necessary to debug the equipment so as to completely close the weld, and the pipe diameter will fluctuate during the closing process, which is generally called ovality.

　　It is necessary for us to control the ovality from the above aspects in order to better cooperate API 5L Hot Rolled Seamless Carbon Steel Pipes in the construction, the first place, the selection of raw materials, the selection of large steel raw materials, the general plate edge is uniform, the seamless carbon steel pipes wall thickness is symmetrical, the second, the production specification, the National Standard Specification must be used, and the ovality of the national standard is higher than the ministerial standard in terms of technical requirements.

　　There are basically two specifications for seamless carbon steel pipes industry in China. One is the specification of the Ministry of petroleum, SY / t5037 series. This specification is quoted from the national specifications of the former Soviet Union.The other is the national specification, which is GB / t9711 series. The state has published this specification since 1997. After improvement, it is now the most important The columns are GB / t9711.1-2011 and GB / t9711.2-2011.

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