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API Casing

Application: Used as the Structural Retainer for the Walls of Oil, Gas Wells

Specification: OD: 4 1/2’’ ~ 20’’ (114.3mm ~ 508mm)

                          WT: 0.205’’ ~ 0.635’’ (5.21mm ~ 16.13mm)

                          LENGTH: R1, R2, R3

Standard: API 5CT J55/K55/N80/C75/L80/C90/T95/Q125

Process Type: Seamless (SMLS), Electric Resistance Welded (ERW)

End: Beveled, Square Cut, With LTC/STC/BTC/VAM Connection

Surface: Anti-corrosion&water Based Paint

Packing: Protection Caps in Both Ends, Waterproof Paper Wrapped, Two Tags

For details, delivery time and prices, please mail us

               

 Production Process of API Casing Steel Pipe 

 Process of API Casing Steel Pipe 




 Specification of API Casing Steel Pipe 


 Tolerance 

Types of steel tubes
Outer Diameter
Wall Thickness
Cold-rolled tubes
Tube sizes(mm)
Tolerances(mm)
Tolerances(mm)
<114.3
±0.79
-12.5%



 Technical Datas of API Casing Steel Pipe 

 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 - -


 Surface of API Casing Steel Pipe 

Anti-corrosion Water Based Paint


 Packing of API Casing Steel Pipe