API 5ct N80 and L80 Oil casing Overview
API 5CT N80 oil casing is an important equipment in oil drilling. The main equipment includes Drill Pipe, oil casing, drill collar and small Diameter drill pipe.
api 5ct l80 oil casing is also an important equipment in oil drilling. The main steel grades include H-40, J-55, K-55, N-80, C-75, L-80, C-90, C-95, P-110, Q-125.
There are five main differences:
(1) Performance
L80 is an Oil Well Pipe with good resistance to carbon dioxide corrosion and seawater corrosion. Therefore, this performance makes L80 a commonly used oil casing in offshore Oil and gas drilling. N80 steel oil casing is an important equipment for oil drilling.
(2) Mechanical performance test
N80: Tensile strength ≥517MPa; Yield strength: 379MPa~552MPa; Minimum elongation: 19%
L80: Tensile strength ≥655MPa; Yield strength: 379MPa~552MPa; Minimum elongation: 15%
(3) Heat treatment
PSL1 requirements: N80 and L80 go the same way (both can be delivered in rolls);
PSL2 requirements: N80 and L80 products should be normalized as a whole or normalized and tempered. If they are thick, they should be thickened and then normalized or normalized and tempered.
(4) Wall thickness detection
PSL1: N80 and L80 are used to measure wall thickness without coverage requirements;
PSL2: N80 and L80 are used for wall thickness measurement and recording processing. The optimal coverage area of the entire Length of the automatic detection system should reach 25%.
PSL1: N80 and L80 do not have mandatory requirements for destructive testing of pipes;
PSL2: All N80 and L80 pipes shall be tested to one or more of the standards specified in 10.15.5 to find out whether the inner and outer surfaces of the pipe can accept L4 level longitudinal defects.