Oil casing importing

Oil casing import
(1)oil casing main importing countries are: Germany, Japan, Romania, the Czech Republic, Italy, Britain, Austria, Switzerland, the United States, Argentina, Singapore also. Standard reference import more American Petroleum Institute Standard API5A, 5AX, 5AC. Steel grade is H-40, J-55, N-80, P-110, C-75, C-95 and the like. The main specifications for 139.77.72R-2,177.89.19R-2,244.58.94R-2,244.510.03R-2,244.511.05R-2 and so on.
(2)API predetermined length in three ways: i.e., R-1 is 4.88 ~ 7.62m, R-2 is 7.62 ~ 10.36m, R-3 is 10.36m to longer. 　　
(3)some of the imported goods marked with LTC words, that is the filaments buckle sleeve.
(4)The casing pipe imported from Japan in addition to using API standards, there are a small part implementation of the Japanese factory standards (such as Nippon Steel, Sumitomo, Kawasaki, etc.), steel grades are the NC-55E, NC-80E, NC-L80, NC-80HE and so on.
(5) In the case of claims, there have been black buckle, threaded injury, tube folding buckle down and threaded standoff ultra-poor, ultra poor coupling J value the appearance of defects and brittle casing, yield strength and low intrinsic quality problems.