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Category Welded Steel Pipe

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API 5CT Oil Tubing Dimension:

Label

OD (mm)

WT (mm)

Type of End-finish

Inch

NU T&C

EU T&C

H40

J55

L80

N80

C90

T95

P110

1.9

2.75

2.9

2.76

48.26

3.68

PNUI

–

1.9

3.65

3.73

–

48.26

5.08

1.9

4.42

–

48.26

6.35

–

2 3/8

–

60.32

4.24

–

2 3/8

4.6

4.7

–

60.32

4.83

PNU

2 3/8

5.8

5.95

–

60.32

6.45

–

PNU

2 3/8

6.6

–

60.32

7.49

–

2 3/8

7.35

7.45

–

60.32

8.53

–

2 7/8

6.4

6.5

–

73.02

5.51

PNU

2 7/8

7.8

7.9

–

73.02

7.01

–

PNU

2 7/8

8.6

8.7

–

73.02

7.82

–

PNU

2 7/8

9.35

9.45

–

73.02

8.64

–

2 7/8

10.5

–

73.02

9.96

–

3 1/2

7.7

–

88.9

5.49

–

3 1/2

9.2

9.3

–

88.9

6.45

PNU

3 1/2

10.2

–

88.9

7.34

–

3 1/2

12.7

12.95

–

88.9

9.52

–

PNU

3 1/2

14.3

–

88.9

10.92

–

3 1/2

15.5

–

88.9

12.09

–

9.5

–

101.6

5.74

–

10.7

–

101.6

6.65

–

13.2

–

101.6

8.38

–

16.1

–

101.6

10.54

–

4 1/2

12.6

12.75

–

114.3

6.88

PNU

–

4 1/2

15.2

–

114.3

8.56

–

P-Plain end; N-Non Upset;U-External upset;T&C-Threaded and coupled

Trade Services

Customized Solutions
Based on industry experience and customer needs analysis, provide matching solution suggestions such as material selection (carbon steel/alloy steel/stainless steel), specification matching (wall thickness/pressure rating), and application scenario optimization (petroleum/chemical/nuclear power).
Global Logistics
Integrate the international logistics network (sea freight/air freight/land transportation), and provide a real-time cargo tracking system (GPS positioning + customs clearance progress).
Inventory Optimization
Based on industry data analysis, dynamically adjust inventory classification (material type/dimension/regional warehouse), implement Just-in-Time (JIT) supply chain management, and reduce the risk of slow sales.
Compliance Certification
Assist in providing international certification documents such as ISO, ASTM, API, etc., to ensure that products meet the access requirements of the target market.
End-to-End Tracking
Provide full life cycle services from order confirmation to after-sales support, and offer technical consultation for installation guidance throughout the whole process.

Processing Services

Custom Cutting
Support cutting by laser, plasma, sawing machine, and self-propelled cutting machine to meet different dimensional requirements (such as fixed length, multiple length), and provide bevel processing services.
Forming
Provide elbow bending, flaring, and necking processing.
Surface Treatment
Provide surface treatment methods such as pickling, phosphating, polishing, sandblasting, painting, coating, galvanizing, and buffing.
Machining
Provide threading, chamfering, and drilling processing.

Quality Inspection
Provide third-party inspection reports (such as chemical composition analysis, mechanical properties, UT flaw detection) to ensure that products meet the standards.

Common standards for Welde carbon steel pipes		Common Grades	Main Application
Steel Pipe for Fluid Service	GB/T 14291	Q195、Q215、Q235	d pipe for mine fluid sevice
	GB/T 3091	Q195、Q215、Q235	Welded pipe for low pressure fluid service
	SY/T 5037	L245 (Gr.b), L290 (X42), L360 (X52), L415 (X60), L450 (X65), L485 (X70), L555 (X80)	Spirally submerged arc welded steel pipe for pipelines for low pressure fluid service
	ASTM A53	Gr.A, Gr.B, Gr.C	Black and hot-hipped galvanized welded and seamless steel pipe
	BS EN10217-1	P195TR1，P235TR1	Welded steel tubes for pressure purposes – Technical delivery conditions – Part 1: Electric welded and arc welded non-alloy steel tubes with specified room temperature properties
	BS EN10217-2	P265TR1，P295TR1	Welded steel tubes for pressure purposes – Technical delivery conditions – Part 2: Electric welded and arc welded non-alloy steel tubes with specified elevated temperature properties
Steel Pipe for Ordinary Structure	GB/T 13793	Q195、Q215、Q235、Q355B	Longitudinally electric resistance welded steel pipe
	SY/T 5040	L245 (Gr.b), L290 (X42)，L360 (X52), L415 (X60)	Spirally submerged arc welded steel pipe piles
	ASTM A252	Gr. 1,Gr. 2,Gr. 3	Welded and seamless steel pipe piles
	BS EN10219-1	S235JRH,S355J2H,S460NH	Cold formed welded structural hollow sections of non-alloy and fine grain steels – part1: Technical delivert conditions
Line Pipe	GB/T 9711.1	(≈PSL1)L210(Gr.a),L245 (Gr.b), L290 (X42), L360 (X52), L415 (X60)	Steel pipe for pipeline transportation system of petroleum and natural gas industries(Class A steel pipe)
	GB/T 9711.2	(≈PSL2)L245NB,L415 N(X60), L450 N(X65), L485N (X70), L555N (X80)	Steel pipe for pipeline transportation system of petroleum and natural gas industries(Class B steel pipe)
	API 5L PSL1/2	Gr.a,Gr.b, X42/52/60/65/70/80	Line pipe
Casing	API 5CT/ ISO 11960 PSL1	H40, J55,K55	Steel pipe for use as casing or tubing for wells of petroleum and natural gas industries

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