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Seamless steel pipes for petroleum use

Process: Hot rolling quenching and tempering, phosphating treatment
Surface: Clean inner and outer walls without rust or dents
Ra≤：3.2‑6.3μm
Material: commonly used 27SiMn, J55, N80
Specification: Outer diameter 60-508mm, wall thickness 4-36mm customizable

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OD*WT（mm）

48*4 48*6 60*6 76*8 89*8 89*10 114*12 159*12 219*12 Custom Specs

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Product Detail

Product Overview：

Seamless steel pipes for petroleum are mainly used for seamless steel pipes for furnace tubes, heat exchanger tubes, and pipelines in petroleum/refining plants. Hardness is generally measured by three indicators: Brinell, Rockwell, and Vickers. Brinell hardness is widely used and is often represented by the indentation diameter to indicate the hardness of steel pipes, but it is not suitable for harder or thinner steel pipes. Rockwell hardness has a wide range of applications and is suitable for measuring steel pipes ranging from extremely soft to extremely hard. However, due to its small indentation, the hardness value is not as accurate as the Brinell method. Vickers hardness can be used to determine the hardness of very thin steel pipes and surface layers. Execution standard: GB9948. Representative materials: 10 #, 20 #, 15CrMo, etc.

Product List
Product Name:	GB9948 Seamless steel pipes for petroleum cracking
Product Name:	YB528 petroleum drilling pipe \| seamless steel pipe
Product Name:	Hot-rolled seamless steel pipe for petroleum
Product Name:	20 # Seamless Steel Pipe for Petroleum \| Seamless Pipe
Product Name:	P11 seamless steel pipe for petroleum \| seamless pipe
Product Name:	Seamless steel pipe for petroleum transportation \| Seamless pipe
Product Name:	API drilling oil casing \| seamless steel pipe
Product Name:	National standard seamless steel pipe for petroleum \| Seamless pipe

Parameter range
Outer diameter	Φ6mm‑Φ219mm
Wall thickness	0.5mm‑20mm
Standard length	1‑12m， Support customization of short and long scales
Outer diameter accuracy	Maximum ± 0.03mm
Executive Standards	API SPEC 5CT, API 5L, ISO 3183, GB/T 9711
Non-standard customization	Special wall thickness, inner hole processing, pressure tolerance, heat treatment, thread processing, and anti-corrosion treatment can all be customized

Petroleum Cracking Tube GB/T 9948-2025 (Refinery Unit Furnace Tube and Pipeline)
Outer diameter (mm)	48	60	76	89	114	159	219
Common wall thickness (mm)	4、5、6	5、6、7	6、7、8	6、7、8、10	6、8、10、12	8、10、12、14	10、12、14、16

Oil well tubing GB/T 19830-2023 (oil production tubing)
Steel grade: J55, N80, P110
Nominal inch	2‑3/8	2‑7/8	3‑1/2	4‑1/2
Outer diameter (mm)	60.32	73.02	88.90	114.30
Common wall thickness (mm)	4.83	5.51	6.45	6.88

Oil well casing GB/T 19830-2023 (wellbore casing)
Steel grade: J55, N80, P110
Nominal inch	4‑1/2	5‑1/2	6‑5/8	7	9‑5/8
Outer diameter (mm)	114.306.35、7.37	139.70	168.28	177.80	244.48
Common wall thickness (mm)	6.35、7.37	7.72、9.17	8.94、10.59	9.19、10.36	8.94、11.05

Pipeline Pipe (Oil and Gas Transportation) GB/T 9711-2023
Steel grades: L245, L360, X52, X60
Outer diameter (mm)	60.3	88.9	114.3	168.3	219.1	273.1	323.9
Common wall thickness (mm)	4.0、4.8	4.0、5.5	4.5、6.0	6.0、7.1	6.0、7.1、8.0	6.3、7.1、8.0	7.1、8.0、10.0

Optional tolerance range
Tolerance control	Optional manufacturing process
Tolerance ≤ 0.05 mm	Cold rolling
Tolerance ≤ 0.10 mm	Cold rolling
Tolerance ≤ 0.30 mm	Cold drawing \| Cold rolling
Tolerance ≤ 0.50 mm	Cold drawing \| Hot rolling
Tolerance ≤ 1.00 mm	Hot rolling \| Hot expanding

Hot rolled petroleum cracking pipe GB/T 9948-2025
Outer diameter D (mm)	≤50	50‑159	＞159
Outer diameter deviation（mm）	±0.50	±1.0%×D	±1.25%×D+12.5%S /‑10%S
Wall thickness deviation	+15%S /‑10%S	+15%S /‑10%S	+12.5%S /‑10%S

Cold drawn petroleum cracking tube
Outer diameter D (mm)	≤30	30‑50	＞50
Outer diameter deviation（mm）	±0.20	±0.30	±0.8%×D
Wall thickness deviation	+12%S /‑10%S	+12%S /‑10%S	±10%S

Oil well tubing/casing GB/T 19830-2023 (J55/N80/P110)
Project	Outer diameter	Wall thickness
Tolerance	± 0.75% × D	+15% S/-12.5% S

Oil and gas transmission pipeline pipes GB/T 9711-2023
Project	Outer diameter (D ＜ 508mm)	Wall thickness
Tolerance	± 0.75% × D	-12.5% S~+15% S

General tolerances for form and position
Project	Ovalness	Straightness (S ≤ 15mm)
Indicator	≤ 80% outer diameter tolerance	≤1.5 mm/m

S=nominal wall thickness, D=nominal outer diameter

Optional delivery status
Oil removal from oil pipes	Annealing and straightening	Steel pipe corrosion prevention
Steel pipe threading	Length cut-to-length	Steel pipe coating
Steel pipe cap	Exquisite bundling	Beveling

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Product Detail

Product Overview：

Product List
Product Name:	GB9948 Seamless steel pipes for petroleum cracking
Product Name:	YB528 petroleum drilling pipe \| seamless steel pipe
Product Name:	Hot-rolled seamless steel pipe for petroleum
Product Name:	20 # Seamless Steel Pipe for Petroleum \| Seamless Pipe
Product Name:	P11 seamless steel pipe for petroleum \| seamless pipe
Product Name:	Seamless steel pipe for petroleum transportation \| Seamless pipe
Product Name:	API drilling oil casing \| seamless steel pipe
Product Name:	National standard seamless steel pipe for petroleum \| Seamless pipe

Parameter range
Outer diameter	Φ6mm‑Φ219mm
Wall thickness	0.5mm‑20mm
Standard length	1‑12m， Support customization of short and long scales
Outer diameter accuracy	Maximum ± 0.03mm
Executive Standards	API SPEC 5CT, API 5L, ISO 3183, GB/T 9711
Non-standard customization	Special wall thickness, inner hole processing, pressure tolerance, heat treatment, thread processing, and anti-corrosion treatment can all be customized

Petroleum Cracking Tube GB/T 9948-2025 (Refinery Unit Furnace Tube and Pipeline)
Outer diameter (mm)	48	60	76	89	114	159	219
Common wall thickness (mm)	4、5、6	5、6、7	6、7、8	6、7、8、10	6、8、10、12	8、10、12、14	10、12、14、16

Oil well tubing GB/T 19830-2023 (oil production tubing)
Steel grade: J55, N80, P110
Nominal inch	2‑3/8	2‑7/8	3‑1/2	4‑1/2
Outer diameter (mm)	60.32	73.02	88.90	114.30
Common wall thickness (mm)	4.83	5.51	6.45	6.88

Oil well casing GB/T 19830-2023 (wellbore casing)
Steel grade: J55, N80, P110
Nominal inch	4‑1/2	5‑1/2	6‑5/8	7	9‑5/8
Outer diameter (mm)	114.306.35、7.37	139.70	168.28	177.80	244.48
Common wall thickness (mm)	6.35、7.37	7.72、9.17	8.94、10.59	9.19、10.36	8.94、11.05

Pipeline Pipe (Oil and Gas Transportation) GB/T 9711-2023
Steel grades: L245, L360, X52, X60
Outer diameter (mm)	60.3	88.9	114.3	168.3	219.1	273.1	323.9
Common wall thickness (mm)	4.0、4.8	4.0、5.5	4.5、6.0	6.0、7.1	6.0、7.1、8.0	6.3、7.1、8.0	7.1、8.0、10.0

Optional tolerance range
Tolerance control	Optional manufacturing process
Tolerance ≤ 0.05 mm	Cold rolling
Tolerance ≤ 0.10 mm	Cold rolling
Tolerance ≤ 0.30 mm	Cold drawing \| Cold rolling
Tolerance ≤ 0.50 mm	Cold drawing \| Hot rolling
Tolerance ≤ 1.00 mm	Hot rolling \| Hot expanding

Hot rolled petroleum cracking pipe GB/T 9948-2025
Outer diameter D (mm)	≤50	50‑159	＞159
Outer diameter deviation（mm）	±0.50	±1.0%×D	±1.25%×D+12.5%S /‑10%S
Wall thickness deviation	+15%S /‑10%S	+15%S /‑10%S	+12.5%S /‑10%S

Cold drawn petroleum cracking tube
Outer diameter D (mm)	≤30	30‑50	＞50
Outer diameter deviation（mm）	±0.20	±0.30	±0.8%×D
Wall thickness deviation	+12%S /‑10%S	+12%S /‑10%S	±10%S

Oil well tubing/casing GB/T 19830-2023 (J55/N80/P110)
Project	Outer diameter	Wall thickness
Tolerance	± 0.75% × D	+15% S/-12.5% S

Oil and gas transmission pipeline pipes GB/T 9711-2023
Project	Outer diameter (D ＜ 508mm)	Wall thickness
Tolerance	± 0.75% × D	-12.5% S~+15% S

General tolerances for form and position
Project	Ovalness	Straightness (S ≤ 15mm)
Indicator	≤ 80% outer diameter tolerance	≤1.5 mm/m

S=nominal wall thickness, D=nominal outer diameter

Optional delivery status
Oil removal from oil pipes	Annealing and straightening	Steel pipe corrosion prevention
Steel pipe threading	Length cut-to-length	Steel pipe coating
Steel pipe cap	Exquisite bundling	Beveling