PRODUCTS

Oil Pipe
Out Diameter: 1.315"- 20"
Wall Thickness: 0.133"-0.500"
Length:R1(group1),R2(group2),R3(group3)
Materials & Grades:
Casing: API 5CT J55, K55, N80, L80-1, L80-9Cr, L80-13Cr, P110
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Parameter 

Casing Pipe, Steel Casing Pipe, Well Casing 

Sizes:

Out Diameter: 1.315"- 20"
Wall Thickness: 0.133"-0.500"
Length:R1(group1),R2(group2),R3(group3)  

Materials & Grades: 

Casing: API 5CT J55, K55, N80, L80-1, L80-9Cr, L80-13Cr, P110 

Application:

oil well extracting 

borehole 

borewell 

Types:

Seamless Casing

ERW Casing

Casing nipple
Casing coupling 

Connections:

P (Plain end)

STC (short threads)

LTC (long threads)

BTC (buttress threads)

Premium gas-tight connectors

Non-upset ends (NUE)

External upset ends (EUE)

Premium gas-tight connectors

Others special connectors 

Chemical compositions of casing pipe

StandardGradeChemical compositions(%)
API SPEC 5CTJ55CSiMnPSCrNiCuMoV
K550.34~0.390.20~0.351.25~1.50≤0.020≤0.015≤0.15≤0.20≤0.20//
N800.34~0.380.20~0.351.45~1.70≤0.020≤0.015≤0.15///0.11~0.16
L800.15~0.22≤1.000.25~1.00≤0.020≤0.01012.0~14.0≤0.20≤0.20//
P1100.26~0.3950.17~0.370.40~0.70≤0.020≤0.0100.80~1.10≤0.20≤0.200.15~0.25≤0.08

 

Mechanical properties of casing pipe

GradeTypeTotal elongation under load (%)Yield strength (min)MpaYield strength (max)MpaTensile strength min MpaHardness Max (HRC)Hardness Max (HBW)
J55-0.5379552517--
K55-0.5379552655--
N8010.5552758689--
N80Q0.5552758689--
L8010.555265565523241
L809Cr0.555265565523241
L8013Cr0.555265565523241
C90-0.562172468925.4255
C95-0.5655758724--
T95-0.565575872425.4255
P110-0.6758965862--
Q125All0.658621034931--

 

Casing Pipe Manufacturing Process:

Steel ingot heating → hydraulic punching → reheating → extension → periodic rolling → reheating → sizing → cooling → straightening → pipe cutting → inspection

1. An annular heating furnace is required for ingot heating;
2. Punching and reheating with hydraulic press;
3. The oil casing plant uses a two-roller guide plate extension machine for extension;
4. Re-use a disc heating furnace for periodic rolling, and use a non-entry furnace for reheating, cooling, straightening, pipe cutting, and inspection. 

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