API 5CT N80 Casing Pipe

API 5CT is a specification for casing and tubing for petroleum and natural gas industries-used for wells. This Standard specifies the technical delivery conditions for steel pipes (casing, tubing and pup joints), coupling stock, coupling material and accessory material and establishes requirements for three Product Specification Levels (PSL-1, PSL-2, PSL-3). Grade N80 is an API 5CT oil casing pipe and mostly utilized for oil well with varied end connections such as non-Upset ends or an external upset end.

There is two types for API 5CT N80 oilfield casing pipes: N80-1 and N80-Q types, which have the same chemical composition and mechanical attributes while just various in the heat treatment. N801 steel pipe is treated by normalizing and tempering and N80Q is treated by quenching and tempering. The collapsing strength and internal pressure strength of N80Q are higher than that of N801 correspondingly.

API 5CT N80 Casing Tubing Color Code

Name	Casing	Coupling
N80-1	a bright red band	entire red coupling
N80-Q	a bright red band + a green band	entire red coupling + a green band

API 5CT N80 Chemical Composition

Grade	C	Si	Mn	P	S	Cr	Ni	Cu	Mo
N80 type1/Q	0.34-0.38	0.20-0.35	1.45-1.70	0.020	0.015	0.15	/	/	/

API 5CT N80 Mechanical Property

Grades	Yield Strength (Mpa)	Tensile Strength (Mpa)	Elongation under load, %
N80 type 1	552-758	689	0.5
N80 type Q	552-758	689	0.5

API 5CT N80 Tolerance

Item		Allowable tolerance
Outer diameter	Pipe body	D≤101.60mm±0.79mm
		D≥114.30mm+1.0%
		-0.5%
Wall thickness		-12.5%
Wight	Single piece	+6.5%+3.5%
	Total weight	-1.75

API 5CT N80 Size Chart

Outer Diameter		Wall Thickness	Weight	Grade	Threaded	Length
in	mm	kg/m	lb/ft
4 1/2″	114.3	14.14-22.47	9.50-11.50	N80	LTC/STC/BTC	R1/R2/R3
5″	127	17.11-35.86	11.50-24.10	N80	LTC/STC/BTC	R1/R2/R3
5 1/2″	139.7	20.83-34.23	14.00-23.00	N80	LTC/STC/BTC	R1/R2/R3
6 5/8″	168.28	29.76-35.72	20.00-24.00	N80	LTC/STC/BTC	R1/R2/R3
7″	177.8	25.30-56.55	17.00-38.00	N80	LTC/STC/BTC	R1/R2/R3
7 5/8″	193.68	35.72-63.69	24.00-42.80	N80	LTC/STC/BTC	R1/R2/R3
8 5/8″	219.08	35.72-72.92	24.00-49.00	N80	LTC/STC/BTC	R1/R2/R3
9 5/8″	244.48	48.07-86.91	32.30-58.40	N80	LTC/STC/BTC	R1/R2/R3
10 3/4″	273.05	48.73-97.77	32.75-65.70	N80	LTC/STC/BTC	R1/R2/R3
11 3/4″	298.45	62.50-89.29	42.00-60.00	N80	LTC/STC/BTC	R1/R2/R3
13 3/8″	339.72	71.43-107.15	48.00-72.00	N80	LTC/STC/BTC	R1/R2/R3

WLD steel is a leading manufacturer & supplier of API 5L Pipe for pipeline transportation systems in the petroleum and natural gas industries. We stock a full range of API 5L N80 PSL-1 & PSL-2 line pipe in seamless and welded processing. You can search for any size & grade steel pipe by our contact form.