Oil Casing,pipes and pipe fittings,Pre Galvanized Steel Pipe,steel tube

Oil Casing

Stainless Steel Seamless Pipe,flanges and relevant pipe fittings,OCTG

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Oil Casing

Category : OCTG

Product Name	API 5CT Oil Casing Pipe
Application	Used for oil casing and tubing in oil wells as well as sidewall,structural retainer
Size	Outer diameter(D)：114.30 mm～508.00 mm wall thickness(S)：5.21 mm～16.13 mm Lengh: R1, R2, R3
Standard	API 5CT J55/K55/N80/C75/L80/C90/T95/Q125
End	Beveled, Square Cut, With LTC/STC/BTC/VAM Connection
Type	SMLS/ERW
Surface	Anti-corrosion&water Based Paint
Packing	Protection Caps in Both Ends, Waterproof Paper Wrapped

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Description
Specification
Standard
Process
Packing

Introduction
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.

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
Available Sizes
Category: ERW, HFW or SMLS
Standards:H-40, J-55, K-55, C-75, L-80, N-80, C-95, AS-95, P-110, L80-13CR
Steel Grade: H40, J55, K55, N80

API Spec 5CT – Specification 5CT/ISO 11960, Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells

Chemical Composition

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

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	-	-

Manufacturing process of API casing
Steel ingot heating → hydraulic punching → reheating → extension → periodic rolling → reheating → sizing → cooling → straightening → pipe cutting → inspection
1. An annular heating furnace is required for ingot heating;
2. Punching and reheating with the hydraulic press;
3. The oil casing plant uses a two-roller guide plate extension machine for extension;

4. Re-use a disc heating furnace for periodic rolling, and use a non-entry furnace for reheating, cooling, straightening, pipe cutting, and inspection.