API 5CT Oil Casing Pipe

Our API 5CT oil casing pipe is mostly used for oil well drilling. In accordance with the SY/T6194-96 standard, this product can be classified as short thread type and long thread type accompanied with their couplings.

Specifications and Surface Quality
Firstly, the domestic API 5CT oil casing pipe should possess the unfixed length range from 8 to 13m on basis of the SY/T6194-96 standard. However, we can also offer our product with the size of no less than 6m and its quantity should be no more than 20%. Secondly, such phenomenon as crease, hairline, separation, crack or scab can not appear on both inner and outer surfaces of our product. All these defects should be completely removed, and the removed depth must not exceed 12.5% of nominal wall thickness. Thirdly, the same phenomenon as mentioned above is not allowed to appear on the outer surface of casing coupling. Finally, the surface of thread of coupling and casing pipe should be smooth without any burr, tear or other defects that may have a bad influence on the strength and close connection.

Chemical Composition Inspection
Based on the SY/T6194-96 standard, both our API 5CT oil casing pipe and its coupling utilize the same steel grade, and the sulfur and phosphorus contents of respectively less than 0.045%. Next, we strictly abide by the GB222-84 regulations to take the samples for chemical analysis. According to the GB223 provisions, we carry out the chemical analysis. Also, we comply with the first edition of American Petroleum Institute ARISPEC5CT1988 standard. We prepare the samples in accordance with the latest edition of ASTME59. The chemical analysis is carried out according to the latest edition of ASTME350. The national standard steel grade of J55 oil casing pipe is 37Mn5.

Physical Performance Examination
In accordance with the SY/T6194-96 standard, we make the flattening test, tensile test and the hydraulic test for our API 5CT oil casing pipe. Among them, the flattening test accords with the GB246-97 standard, and the tensile test can meet the GB228-87 standard. Based on the first edition of American Petroleum Institute APISPEC5CT1988, we make various tests, such as hydrostatic pressure test, flattening test, sulfide stress corrosion cracking test, tensile test, hardness test, horizontal impact test, as well as grain size measurement. Moreover, the hardness test accords with the provision of the latest edition of ASTME18 or E10. The horizontal impact test abides by the regulation of ASTMA370, ASTME23 and related standard of the latest edition. The grain size measurement follows the latest edition of ASTME112 or other methods.

In compliance with the regulation of SY/T6194-96, the domestic API 5CT oil casing pipe should be strapped with steel wire or belt. The protection ring should be screwed on the exposed part of the thread of each casing pipe and its coupling to well protect the thread.

In the light of the American Petroleum Institute Standard APISPEC5CT1988 1st edition, the steel grade of API 5CT oil casing pipe can be divided into ten types, including H-40, J-55, K-55, N-80, C-75, L-80, C-90, C-95, P-110 and Q-125. We supply the casing pipe accompanied with thread and coupling, or we offer our product in accordance with the following forms for option. For instance, the flat end type round thread or the buttress screw thread can come with the coupling or without the coupling. The other form can be the straight thread with sealing ring structure and the thread end is specially processed.

As a China-based API 5CT oil casing pipe manufacturer and supplier, Yaosheng offers a broad range of products, including API 5CT oilfield tubing, tubing coupling, API 5L seamless steel pipe, and more.

Related Names: Petroleum Casing Pipe | API Casing Tube | Encasement Pipe | Casing Tubing
Other Products