API 5CT Casing & Tubing Steels

General Description

API 5CT casing pipe is used to support the oil and gas pipe wall, and to ensure the drilling process and the post-completion wells normal operation. Each well depending on the depth of drilling and geological conditions, to use several layers of casing. OCTG Tubing pipe goes inside the casing pipe. It is the pipe through which oil makes its way out.
The material includes carbon steel (for the most common use), alloy, chrome and high alloy steels. Based on the strength of the material steel, the pipes are divided into different grades which are as follows: J55, K55, N80, L80, C90, T95, P110, Q125.

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Product Details

Chemical Composition of API Casing & Tubing Steel Grades

Chemical Composition of API Steel Grade for Casing and Tubing, Mass Fraction (%)
Group	Grade	Type	C		Mn		Mo		Cr		Ni	Cu	P	S	Si
Group	Grade	Type	min.	max.	min.	max.	min.	max.	min.	max.	max.	max.	max.	max.	max.
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16
1	H40	—	—	—	—	—	—	—	—	—	—	—	0.030	0.030	—
	J55	—	—	—	—	—	—	—	—	—	—	—	0.030	0.030	—
	K55	—	—	—	—	—	—	—	—	—	—	—	0.030	0.030	—
	N80	1	—	—	—	—	—	—	—	—	—	—	0.030	0.030	—
	N80	Q	—	—	—	—	—	—	—	—	—	—	0.030	0.030	—
2	M65		—	—	—	—	—	—	—	—	—	—	0.030	0.030	—
	L80	1	—	0.43 a		1.90	—	—	—	—	0.25	0.35	0.030	0.030	0.45
	L80	9Cr	—	0.15	0.30	0.60	0.90	1.10	8.00	10.0	0.50	0.25	0.020	0.010	1.00
	L80	13Cr	0.15	0.22	0.25	1.00	—	—	12.0	14.0	0.50	0.25	0.020	0.010	1.00
	C90	1	—	0.35	—	1.20	0.25 b	0.85	—	1.50	0.99		0.020	0.010	—
	C90	2	—	0.50	—	1.90	—	NL	—	NL	0.99	—	0.030	0.010	—
	C95	—	—	0.45 c	—	1.90	—	—	—	—	—	—	0.030	0.030	0.45
	T95	1	—	0.35	—	1.20	025 d	0.85	0.40	1.50	0.99		0.020	0.010	—
	T95	2	—	0.50	—	1.90	—	—	—	—	0.99	—	0.030	0.010	—
3	P110	e	—	—	—	—	—	—	—	—	—	—	0.030 e	0.030 e	—
4	Q125	1	—	0.35		1.35	—	0.85	—	1.50	0.99	—	0.020	0.010	—
	Q125	2	—	0.35	—	1.00	―	NL	—	NL	0.99	—	0.020	0,020	—
	Q125	3	—	0.50	—	1.90	—	NL	—	NL	0.99	—	0.030	0.010
	Q125	4	—	0.50	—	1.90	—	NL	—	NL	0.99	—	0.030	0.020	—
a The carton content for L80 may be increased up to 0.50% maximum if me product is oil-quenched. b The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the wall thickness it less than 17.78 mm c The carton content for C95 may be increased up to 0.55% maximum if the product is oil-quenched. d The molybdenum content for T95 Type 1 may be decreased to 0.15% minimum if the wall thickness is less than 17.78 mm e For EW Grade P110, the phosphorus content shall be 0.020% maximum and the sulfur content 0.010% maximum NL = No limit elements shown shall be reported in product analysis.

Mechanical Properties
Group	Grade	Type	Total	Yield strength MPa		Tensile	Hardness max.
Group	Grade	Type	%	min.	max.	MPa	HRC	HBW
1	H40	－	0.5	276	552	414	－	－
	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	－	－
	R95	－	0.5	655	758	724	－	－
2	M65	－	0.5	448	586	586	22	235
	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	1	0.5	621	724	689	25.4	255
	T95	1	0.5	655	758	724	25.4	255
	C110	－	0.7	758	828	793	30	286
3	P110	－	0.6	758	965	862	－	－
4	Q125	1	0.65	862	1034	931		－
a. In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method. b. No hardness limits, but the maximum variation is controled by manufacturer acc API 5CT.

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