API 5CT K55/J55 SC steel oil casing and tubing

DIN 17175 Heat-resistant seamless steel boiler tube
November 22, 2017
API 5CT J55 STC BTC LTC oil casing pipe
November 25, 2017

API 5CT K55/J55 SC steel oil casing and tubing

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.API 5CT J55 Casing Tubing is a API 5CT Oil Casing Pipe & mainly used for oil well drilling. We manufacture API 5CT J55 Casing Tubing in accordance with the SY/T6194-96 standard, it is available as short thread type and long thread type supplied with their couplings.

This Standard specifies the technical delivery conditions for steel pipes (casing, tubing and pup joints), coupling stock, coupling material and accessory material 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, L-80 9Cr and C110, are contained in Annex H.
Peotroleum and natureal gas industies – Steel pipes for use as casing or tubing for wells.

Products: API SPEC 5CT Seamless Steel  Tubes
Applications: It is widely used for oil casing and tubing in oil wells
Grades: J55, K55, N80, L80-1, L80-9Cr, L80-13Cr, P110, Q125, K55 D10, L80 D10.
Special Service: Sweet Service, Sour Service, Anti-H2S, NACE MR0175/ISO15156
Produce Process: Hot Rolled, Cold Drawn, Hot Expanded.
Accessories: Pup Joint, Coupling (Coupling Stock), Blast Joint, Crossover etc.

Surface treatment: Bare,Varnished, Zinc coating, Anti-corrosion,3PE,PE/PP/EP/FBE. etc.
Model number: J55,K55,N80,L80,C90,T95,P110,Q125,V150,etc
Inspection: With chemical composition and mechanical properties analysis; hydrostatic test,
dimensional and visual inspection, also with nondestructive inspection.

Connection: API connection and Premium connection, like TPCQ, HSM etc.

Dimension Tolerance

Types of steel tubesOuter DiameterWall Thickness
Cold-rolled tubesTube sizes(mm)Tolerances(mm)Tolerances(mm)

Chemical Composition

StandardGradeChemical compositions(%)

Mechanical propertiesc

GradeTypeTotal elongation under load (%)Yield strength (min)Yield strength (max)Tensile strength min MpaHardness







Oil casing is used to support the oil, gas wells of steel pipe, in order to ensure the drilling process and the completion of the entire well after the normal operation. Each well has several layers of casing depending on the drilling depth and geology. Casing down to use cement cementing, it and the tubing, drill pipe is different, can not be reused, a one-time consumption of materials. Therefore, the casing of the total consumption of more than 70% of the wells. Casing according to the use can be divided into: catheter, surface casing, casing technology and oil casining

API 5CT oil casing used in oil well drilling, which is mainly used for drilling and completion of the right wall of the support, to ensure that the conduct and completion of the drilling process after the normal operation of the wells. Casing is to maintain the wells run lifeline.

k55 steel grade specifications
difference between j55 and k55 casing
k55 casing properties
j55 steel properties
api 5ct k55 mechanical properties
j55 tubing yield strength
j55 vs l80
j55 tubing tensile strength

Leave a Reply