Tubing and Casing, Line Pipes

Tubing and Casing are usages for Conveying gas and oil in both the oil and natural industries according API SPEC 5CT and ISO11960.

ISO 11960 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 5, Casing, tubing and drill pipe.

With the normal steel grade API 5CT H40, API 5CT J55, API 5CT K55, API 5CT N80, API 5CT N80, API 5CT M65, API 5CT L80, API 5CT L80, API 5CT L80, API 5CT C90, API 5CT C90, API 5CT C90, API 5CT C90, API 5CT C95, API 5CT T95, API 5CT T95, API 5CT T95, API 5CT T95, API 5CT P110, API 5CT Q125, API 5CT Q125, API 5CT Q125.

Petroleum and natural gas industries —Steel pipes for use as casing and tubing for wells.

This standard specifies the technical delivery conditions for steel pipes (casing, tubing, plain-end casing liners and pup joints), coupling stock and accessories and establishes requirements for three Product Specification Levels (PSL-1, PSL-2, PSL-3). The requirements for PSL-1 are the basis of this standard. The requirements that define different levels of standard technical requirements for PSL-2 and PSL-3, for all Grades except H-40 and L-80 9Cr, are contained in Annex H.

For pipes covered by this standard, the sizes, masses and wall thicknesses as well as grades and applicable end-finishes are listed in Tables C.1 to C.3 and Tables E.1 to E.3. By agreement between the purchaser and manufacturer, this standard can also be applied to other plain-end pipe sizes and wall thicknesses.

The main chemical compositions(%) of Tubing and Casing:

Grade

Type

C

Mn

Mo

Cr

Ni

Co

P

S

Si

Min

Max

Min

Max

Min

Max

Min

Max

Max

Max

Max

Max

Max

H40

–

–

–

–

–

–

–

–

–

–

–

0.03

0.03

–

J55

–

–

–

–

–

–

–

–

–

–

–

0.03

0.03

–

K55

–

–

–

–

–

–

–

–

–

–

–

0.03

0.03

–

N80

1.00

–

–

–

–

–

–

–

–

–

–

0.03

0.03

–

N80

Q

–

–

–

–

–

–

–

–

–

–

0.03

0.03

–

M65

–

–

–

–

–

–

–

–

–

–

–

0.03

0.03

–

L80

1.00

–

0.43a

–

1.90

–

–

–

–

0.25

0.35

0.03

0.03

0.45

L80

9Cr

–

0.15

0.30

0.60

0.90

1.10

8.00

10.00

0.50

0.25

0.02

0.01

1.00

L80

13Cr

–

0.22

0.25

1.00

–

12.00

14.00

0.50

0.25

0.02

0.01

1.00

C90

1.00

–

0.35

–

1.20

0.25b

0.85

–

1.50

0.99

–

0.02

0.01

–

C90

2.00

–

0.50

–

1.90

–

Nl

–

NL

0.99

–

0.03

0.01

–

C95

–

0.45c

–

1.90

–

–

–

–

–

–

0.03

0.03

0.45

T95

1.00

–

0.35

–

1.20

0.25d

0.85

0.40

1.50

0.99

–

0.02

0.01

–

T95

2.00

–

0.50

–

1.90

–

–

–

–

0.99

–

0.03

0.01

–

P110

–

–

–

–

–

–

–

–

–

0.03

0.03

–

Q125

1.00

–

0.35

–

1.00

0.75

–

1.20

–

0.99

–

0.02

0.01

–

Q125

2.00

–

0.35

–

1.00

NL

–

NL

–

0.99

–

0.02

0.02

–

Q125

3.00

–

0.50

–

1.90

NL

–

NL

–

0.99

–

0.03

0.01

–

Q125

4.00

–

0.50

–

1.90

NL

–

NL

–

0.99

–

0.03

0.02

–

Note:

a product uses oil quenching, L80 grade carbon content of the upper limit may be increased to 0.50%.
b If the wall thickness
c If the product oil quenching, the C95 grade carbon content limit may be increased to 0.55%.
d If the wall thickness
NL-Not limit, but must show the element content in the product by reported.

Mechanical Properties of Tubing and Casing：

Grade	Type	TEUL(%)	Yield strength （MPa）		Tensile (MPa)	Hardnessa		S.W.T. （mm）	HRCb
			Min	Max	Min	Min	Max
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	–	–	–	–
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、2	0.5	621	724	689	25.4	255	≤12.70	3
C90	1、2	0.5	621	724	689	25.4	255	12.71~19.04	4
C90	1、2	0.5	621	724	689	25.4	255	19.05~25.39	5
C90	1、2	0.5	621	724	689	25.4	255	25.4	6
C95	–	0.5	655	758	724	–	–	–
T95	1、2	0.5	655	758	724	25.4	255	≤12.70	3
T95	1、2	0.5	655	758	724	25.4	255	12.71~19.04	4
T95	1、2	0.5	655	758	724	25.4	255	19.05~25.39	5
T95	1、2	0.5	655	758	724	25.4	255	25.4	6
P110	–	0.6	758	965	862	–	–	–	–
Q125	1~4	0.65	862	1034	931	b	–	≤12.70	3
Q125	1~4	0.65	862	1034	931	b	–	12.71~19.04	4
Q125	1~4	0.65	862	1034	931	b	–	>=19.05	5

Note:

a Dispute, the Rockwell hardness of the laboratory should be used as the arbitration.
b Hardness limit is not specified, but according to the provisions of 7.8 and 7.9 in the most amount of change as production control.
TEUL: Total elongation under load
SWT: Specified wall thickness
HRC Allowable hardness change