API 5CT N80-1/N80q Seamless Casing Steel Pipe

Casing and tubing for Sour Oil and Gas Service must have a good anti-SSCC (sulfide stress corrosion and cracking) performance in the environment where hydrogen sulfide corrosion exists. After an indepth study, we has successfully developed tubular goods of the Cr-Mo series for this purpose with good hardenability and tempering stability that when tempering takes places at certain temperatures uniform and fine sorbite structures can be obtained. Their mechanical properties can meet fully the requirements of corresponding grades and their anti-SSC performance is excellent by regulating the chemical composition and adopting different heat treatment procedures

API 5CT N80 Casing Tubing is a API 5CT Oil Casing Pipe & mainly used for oil well drilling. We manufacture API 5CT N80 Casing Tubing in accordance with the SY/T6194-96 standard, it is available as short thread type and long thread type supplied with their couplings.

Main difference for API 5CT N80-1 and N80Q.
In API 5CT specification, for grade N80 there are two different level N80-1 and N80Q. The same part is both N80-1 and N80Q casing pipe have same tensile strength. The different part is impact properties and delivery condition. N80-1 delivery condition is normalizing. The final hot rolled temperature is higher than critical temperature Ar3, and after stretch reducing and air cooling, so could use hot rolled process replace the normalizing. Impact test properties and Non-destructive test is not required.