API 5CT 18 5/8" Casing Buttress Coupling Stock Grade K55
The purchased order of coupling stock blank shall not only meet the manufacturing, test, inspection and identification requirements of API 5CT specification for casing and tubing, but also meet the following technical requirements
. 1、 During the manufacturing, experiment and inspection of the manufacturer, the purchaser may send personnel to conduct spot inspection
Field supervisor.
2、 Manufacturing method
Hot rolled seamless pipes shall be used.
The chemical composition shall not only meet the requirements of API Spec 5CT specification for casing and tubing, but also meet the contract requirements.
3、 Mechanical properties
Mechanical properties shall meet the requirements of API Spec 5CT specification for casing and tubing IV. hardness
Steel grade J55, hardness ≥ 180hbw, steel grade n80-1 and steel grade n80-q, hardness 200hbw, steel grade l80-1, hardness ≥ 241hbw, steel grade P110, hardness ≥ 275hbw
