Oil casing pipe

Process: Hot rolling, normalizing and tempering
Surface: Smooth surface, no cracks, laps or burrs
Ra: ≤6.3μm
Material: API5CT J55, N80, P110, Q125
Specification: Outer diameter 60.3–508mm, wall thickness 5.21–16.13mm customizable

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OD*WT（mm）

60.3*4.83 73.0*5.51 88.9*6.45 114.3*6.88 114.3*7.37 139.7*7.72 177.8*8.05 219.1*8.94 244.5*8.94 273.1*9.91

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Product Detail

Product Overview：

Oil casing pipe belongs to OCTG, manufactured to API 5CT standard. It is used for well cementing and borehole support in oil & gas wells, including surface, intermediate and production casing. Carbon steel grades like J55, N80 fit medium-depth wells; high-strength P110, Q125 suit deep and high-pressure wells. API 5CT casing covers OD 48.3–508mm, wall thickness 5.21–16.13mm. Main steel grades: J55, N80, L80, P110, Q125, available with STC, LTC, BTC threads.

Product List
Product Name:	GB5312 Seamless carbon steel and carbon manganese steel pipes for ships
Product Name:	J55 Oil Casing Pipe
Product Name:	N80 Oil Casing Pipe
Product Name:	L80 Oil Casing Pipe
Product Name:	P110 Oil Casing Pipe
Product Name:	Q125 Oil Casing Pipe
Product Name:	Hot Rolled Oil Casing Pipe

Parameter range
Outer diameter	Φ48.3mm–Φ508mm (1.9″–20″)
Wall thickness	5.21mm–16.13mm
Standard length	R1 8–10m, R2 10–12m, R3 12–13m; support customization of short and long scales
Outer diameter accuracy	Per API 5CT, maximum ±0.75% of OD
Executive Standards	API 5CT, ISO 11960, GB/T 19830, SY/T 6194
Non-standard customization	Customization of special premium connections, coupling materials, anti-corrosion coating, heat treatment (quenched & tempered), and thread types (STC / LTC / BTC) can all be customized

Common specifications
Outer diameter (mm)	60.3	73.0	88.9	114.3	139.7（5-1/2'，most commonly used）	177.8（7'）
Wall Thickness (mm)	4.83	5.51	6.45	6.88 /7.37	7.72 /9.17	8.05 /10.36
Commonly used steel grades	J55,N80	J55,N80	J55,N80,L80	J55,N80,P110	J55,N80,L80,P110,Q125	N80,L80,P110,Q125

Outer diameter (mm)	219.1	244.5（9-5/8'）	273.1	339.7（13-3/8'）	508.0
Wall Thickness (mm)	8.94	8.94 /10.03	9.19	9.65	11.13
Commonly used steel grades	J55,N80,P110	J55,N80,P110	J55,N80	J55,N80	J55

Optional tolerance range
Tolerance control	Optional manufacturing process
OD tolerance ≤ ±0.75% OD	Hot rolling
OD tolerance ≤ ±1.0% OD	Hot rolling
Wall thickness tolerance -5% ~ +12.5%	Hot rolling
Length tolerance ≤ ±150mm	Hot rolling
High precision thread tolerance	Hot rolling + CNC threading

Oil Casing Pipe Tolerance Range
Outer Diameter	≤114.3mm ±0.75%; ＞114.3mm +1.0% / -0.5%
Wall Thickness	±12.5%
Length	Max +1.0m, no short length
Straightness	≤0.2% of total length
End Squareness	≤0.5°

Optional delivery status
Threading & coupling	Heat treatment	Anti-corrosion coating
Cut-to-length	Pipe end bevelling	Thread protector
Straightenin	Bundling	Non-destructive testing

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Product Detail

Product Overview：

Product List
Product Name:	GB5312 Seamless carbon steel and carbon manganese steel pipes for ships
Product Name:	J55 Oil Casing Pipe
Product Name:	N80 Oil Casing Pipe
Product Name:	L80 Oil Casing Pipe
Product Name:	P110 Oil Casing Pipe
Product Name:	Q125 Oil Casing Pipe
Product Name:	Hot Rolled Oil Casing Pipe

Parameter range
Outer diameter	Φ48.3mm–Φ508mm (1.9″–20″)
Wall thickness	5.21mm–16.13mm
Standard length	R1 8–10m, R2 10–12m, R3 12–13m; support customization of short and long scales
Outer diameter accuracy	Per API 5CT, maximum ±0.75% of OD
Executive Standards	API 5CT, ISO 11960, GB/T 19830, SY/T 6194
Non-standard customization	Customization of special premium connections, coupling materials, anti-corrosion coating, heat treatment (quenched & tempered), and thread types (STC / LTC / BTC) can all be customized

Common specifications
Outer diameter (mm)	60.3	73.0	88.9	114.3	139.7（5-1/2'，most commonly used）	177.8（7'）
Wall Thickness (mm)	4.83	5.51	6.45	6.88 /7.37	7.72 /9.17	8.05 /10.36
Commonly used steel grades	J55,N80	J55,N80	J55,N80,L80	J55,N80,P110	J55,N80,L80,P110,Q125	N80,L80,P110,Q125

Outer diameter (mm)	219.1	244.5（9-5/8'）	273.1	339.7（13-3/8'）	508.0
Wall Thickness (mm)	8.94	8.94 /10.03	9.19	9.65	11.13
Commonly used steel grades	J55,N80,P110	J55,N80,P110	J55,N80	J55,N80	J55

Optional tolerance range
Tolerance control	Optional manufacturing process
OD tolerance ≤ ±0.75% OD	Hot rolling
OD tolerance ≤ ±1.0% OD	Hot rolling
Wall thickness tolerance -5% ~ +12.5%	Hot rolling
Length tolerance ≤ ±150mm	Hot rolling
High precision thread tolerance	Hot rolling + CNC threading

Oil Casing Pipe Tolerance Range
Outer Diameter	≤114.3mm ±0.75%; ＞114.3mm +1.0% / -0.5%
Wall Thickness	±12.5%
Length	Max +1.0m, no short length
Straightness	≤0.2% of total length
End Squareness	≤0.5°

Optional delivery status
Threading & coupling	Heat treatment	Anti-corrosion coating
Cut-to-length	Pipe end bevelling	Thread protector
Straightenin	Bundling	Non-destructive testing