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Tubing and Casing

Tubing and Casing

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

tubing-and-casing-line-pipes

The pipes are usaged for Conveying gas,water,and oil in both the oil and natural industries

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.

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

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