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API 5CT N80 Casing pipe

API5CT is an oil casing standard issued by the American Petroleum Institute. N80 oil casing is used for oil well drilling and is mainly used to support the well wall during the drilling process and after well completion, so as to ensure the drilling process and the normal operation of the entire oil well after well completion.
API5CT oil casing can be divided into seamless steel pipe and welded steel pipe, and welded steel pipe mainly refers to straight seam steel pipe. Large-diameter oil casings are generally submerged arc welded straight seam steel pipes.
API 5CT N80 Casing pipe, API 5CT N80 Casing tube, API 5CT L80 Oil casing pipe,L80 casing pipe
1. Specification range:OD: 114.3 MM -508MM(4 1/2"-20”)
2. Materials: H40, J55, K55, N80-1, N80-Q, L80-1,L80-9Cr, L80-13Cr, P110, Q125 etc
3. Executive standards: API 5CT, GB, ISO11960, GOST
4. Length: R1, R2, R3
5. Type: seamless pipe

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API 5L welded pipe

API 5CT Casing pipe

Product Details

A casing pipe is a hollow steel tube that is typically rammed into place through the earth by using a hydraulic or pneumatic jack. After being driven, the displaced soil is removed and the product pipe, or carrier pipe, is inserted inside the steel tube.

Casing pipe connections

API 5CT is applicable to following connections which complied with API SPEC 5B:

• SC:Short round thread casing

• LC:Long ound thread casing

• BC:Buttress thread casing

• NU: Non-upset tubing

• EU:External upset tubing

Dimension Tolerance of casing pipe

Types of steel tubes	Outer Diameter		Wall Thickness
Cold-rolled tubes	Tube sizes(mm)	Tolerances(mm)	Tolerances(mm)
	＜114.3	±0.79	－12.5％
	≥114.3	－0.5％，＋1％	－12.5％

Chemical Composition of casing pipe

Standard	Grade	Chemical compositions（％）
API SPEC 5CT	J55	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	V
	K55	0.34～0.39	0.20～0.35	1.25～1.50	≤0.020	≤0.015	≤0.15	≤0.20	≤0.20	/	/
	N80	0.34～0.38	0.20～0.35	1.45～1.70	≤0.020	≤0.015	≤0.15	/	/	/	0.11～0.16
	L80	0.15～0.22	≤1.00	0.25～1.00	≤0.020	≤0.010	12.0～14.0	≤0.20	≤0.20	/	/
	P110	0.26～0.395	0.17～0.37	0.40～0.70	≤0.020	≤0.010	0.80～1.10	≤0.20	≤0.20	0.15～0.25	≤0.08

Mechanical properties of casing pipe

Grade	Type	Total elongation under load (%)	Yield strength (min)	Yield strength (max)	Tensile strength min Mpa	Hardness Max (HRC)	Hardness Max(HBW)
J55	-	0.5	379	552	517	-	-
K55	-	0.5	379	552	655	-	-
N80	1	0.5	552	758	689	-	-
N80	Q	0.5	552	758	689	-	-
L80	1	0.5	552	655	655	23	241
L80	9Cr	0.5	552	655	655	23	241
L80	13Cr	0.5	552	655	655	23	241
C90	-	0.5	621	724	689	25.4	255
C95	-	0.5	655	758	724	-	-
T95	-	0.5	655	758	724	25.4	255
P110	-	0.6	758	965	862	-	-
Q125	All	0.65	862	1034	931	-	-

API 5CT N80 Casing pipe Test

Chemical Component Analysis , Mechanical Properties (Ultimate tensile strength ,Yield strength ,Elongation )

Technical Properties ( Flattening test , flaring test , bending test , hardness test , blow test , impact test etc )

Exterior size inspection , Nondestructive test ( Ultrasonic flaw detector , eddy curent flaw detector ) Hydrostatic test .

Mill Test Certificate : EN10204/3.1B and EN10204/3.2 Certificate.

Third Party Inspection : SGS , BV etc

API 5CT N80 Casing pipe

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Cangzhou Shenlong Pipe Manufacturing Co., Ltd. is a company& supplier& manufacturer& factory specialized in the production, processing and sales of various steel pipes, such as seamless pipe, welded pipe, straight seam steel pipe, spiral welded steel pipe, hot galvanized steel pipe, coating steel pipe, stainless steel pipe, and pipe fittings, the production base is located in Cangzhou.

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