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Carbon Seamless Steel Pipe
Carbon Seamless Steel Pipe
Carbon Seamless Steel Pipe
Carbon Seamless Steel Pipe
Carbon Seamless Steel Pipe
Carbon Seamless Steel Pipe
Carbon Seamless Steel Pipe
Carbon Seamless Steel Pipe
Carbon Seamless Steel Pipe
Carbon Seamless Steel Pipe
  • Keywords: carbon seamless steel pipe, API 5L carbon seamless steel pipe, A53 carbon seamless steel pipe, CS SMLS, hot rolled carbon seamless steel pipe, cold drawn carbon seamless steel pipe
  • Sizes: 1/4" (8mm)-80" (2000mm);Thickness: 2.11mm-60mm
  • SCH: SCH10,SCH20,STD,SCH40,SCH60,XS,SCH80,SCH100,SCH120,SCH160,XXS
  • Coating: 3PE Coating,3PP Coating,FBE Coating,Epoxy Coating,Special Painting
  • Standards: API 5L, API 5CT, ASTM A53, ASTM A106, ASTM A179, ASTM A192, ASTM A252, ASTM A333, ASTM A335, ASTM A672
  • Use: Seamless carbon steel for high temperature service and petrochemical
  • Length Options: Small bore up to 150nb: 6.0m. Large bore over 150nb: 6.1m or Single/Double random (5.8 to 11.8m)

Product Description of Carbon Seamless Steel Pipe

Carbon seamless steel pipes are manufactured from high-quality carbon steel billets through advanced hot rolling or cold drawing processes, forming a continuous structure without any weld seams. This seamless construction ensures superior mechanical strength, pressure resistance, and structural integrity. With excellent performance under high-temperature, high-pressure, and dynamic loading conditions, carbon seamless steel pipes are widely used in industries such as oil & gas, petrochemicals, power generation, boiler systems, and mechanical engineering. Their uniform microstructure and precise dimensional control enable consistent quality and reliable operation in critical applications. In addition, carbon seamless steel pipes offer good machinability and weldability, along with the flexibility to meet various international standards such as API, ASTM, and EN specifications. Surface treatments and coatings can further enhance their corrosion resistance and service life, adapting to diverse working conditions.


Key Features of Carbon Seamless Steel Pipe

PropertyDescription
High StrengthExcellent yield and tensile strength; suitable for high-pressure applications
Uniform StructureNo weld seam means consistent mechanical properties throughout the pipe
Pressure ResistanceSuperior ability to withstand internal and external pressure compared to welded pipe
Good WeldabilityCan be welded using standard procedures despite being seamless
FormabilitySuitable for bending, flanging, and similar forming operations
Cost-EffectiveLower cost than alloy or stainless steel while providing good performance
Leak-ProofSeamless construction eliminates weld seam leakage risks
Smooth Internal SurfaceReduces friction and improves flow efficiency


Classification of Carbon Seamless Steel Pipe by Application

TypeStandardGradesApplication
Structural PipeGB/T 8162, ASTM A5310#, 20#, 45#, Q345, 20Cr, 40CrGeneral structures, machinery parts, construction
Fluid Transport PipeGB/T 8163, ASTM A10610#, 20#, Q345Water, oil, gas, steam transport
Low/Medium Pressure Boiler PipeGB 3087, ASTM A17910#, 20#Boiler tubes, superheater tubes, water wall tubes
High Pressure Boiler PipeGB 5310, ASTM A10620G, 15MoG, 12Cr1MoVGHigh-pressure steam boilers, power generation
Petrochemical PipeGB 9948, ASTM A33510#, 20#, 12CrMo, 15CrMoRefinery furnaces, heat exchangers, process piping
Hydraulic/Precision PipeDIN 2391, EN 10305ST35, ST45, ST52, 20#Hydraulic cylinders, automotive components, precision machinery
Shipbuilding PipeGB/T 5312360, 410, 460Marine pressure piping, boilers
Gas Cylinder PipeGB 1824837Mn, 34Mn2V, 30CrMoHigh-pressure gas cylinders


Chemical Components & Mechanical Properties of Carbon Seamless Steel Pipe

Standard

Grade

Chemical Components (%)

Mechanical Properties

ASTM A53


C

Si

Mn

P

S

Tensile STrength(Mpa)

Yield STrength(Mpa)

A

≤0.25

-

≤0.95

≤0.05

≤0.06

≥330

≥205

B

≤0.30

-

≤1.2

≤0.05

≤0.06

≥415

≥240

ASTM A106

A

≤0.30

≥0.10

0.29-1.06

≤0.035

≤0.035

≥415

≥240

B

≤0.35

≥0.10

0.29-1.06

≤0.035

≤0.035

≥485

≥275

ASTM SA179

A179

0.06-0.18

-

0.27-0.63

≤0.035

≤0.035

≥325

≥180

ASTM SA192

A192

0.06-0.18

≤0.25

0.27-0.63

≤0.035

≤0.035

≥325

≥180

API 5L PSL1

A

0.22

-

0.90

0.030

0.030

≥331

≥207

B

0.28

-

1.20

0.030

0.030

≥414

≥241

X42

0.28

-

1.30

0.030

0.030

≥414

≥290

X46

0.28

-

1.40

0.030

0.030

≥434

≥317

X52

0.28

-

1.40

0.030

0.030

≥455

≥359

X56

0.28

-

1.40

0.030

0.030

≥490

≥386

X60

0.28

-

1.40

0.030

0.030

≥517

≥448

X65

0.28

-

1.40

0.030

0.030

≥531

≥448

X70

0.28

-

1.40

0.030

0.030

≥565

≥483

API 5L PSL2

B

0.24

-

1.20

0.025

0.015

≥414

≥241

X42

0.24

-

1.30

0.025

0.015

≥414

≥290

X46

0.24

-

1.40

0.025

0.015

≥434

≥317

X52

0.24

-

1.40

0.025

0.015

≥455

≥359

X56

0.24

-

1.40

0.025

0.015

≥490

≥386

X60

0.24

-

1.40

0.025

0.015

≥517

≥414

X65

0.24

-

1.40

0.025

0.015

≥531

≥448

X70

0.24

-

1.40

0.025

0.015

≥565

≥483

X80

0.24

-

1.40

0.025

0.015

≥621

≥552


Inspection Of Carbon Seamless Steel Pipe

Non-destructive testing (RT, UT, MT or PT)

Heat treatment execution, if specified.

Metallographic examination, if applicable.

Visual and dimensional control.

Hydrostatic test, if applicable.

Painting, coating, marking and color coding check.

Final visual inspection including packaging and quantity control.


Application Of Carbon Seamless Steel Pipe

Carbon seamless steel pipes are extensively applied in the nuclear device, gas conveyance, petrochemical, shipbuilding and boiler industries, with characteristics of high corrosion resistance combined with suitable mechanical properties.

- Nuclear device

- Gas conveyance

- Petrochemical industries

- Shipbuilding and boiler industries


Specifcation of Carbon Seamless Steel Pipe


O.D

ANSI B36.10   B36.19  Wall Thickness

mm

in

mm

Sch5S

Sch10S

Sch10

Sch20

Sch30

Sch40S

STD

Sch40

Sch60

Sch80

XS

Sch80S

Sch100

XXS

8

1/4

13.72

-

1.65

-

-

-

1.73

1.73

1.73

-

3.02

3.02

3.02

-

-

10

3/8

17.14

-

1.65

-

-

-

2.31

2.31

2.31

-

3.2

3.2

3.2

-

-

15

1/2

21.34

1.65

2.11

-

-

-

2.77

2.77

2.77

-

3.73

3.73

3.73

-

7.47

20

3/4

26.67

1.65

2.11

-

-

-

2.87

2.87

2.87

-

3.91

3.91

3.91

-

7.82

25

1

33.4

1.65

2.77

-

-

-

3.38

3.38

3.38

-

4.55

4.55

4.55

-

9.09

32

1 1/4

42.16

1.65

2.77

-

-

-

3.56

3.56

3.56

-

4.85

4.85

4.85

-

9.7

40

1 1/2

48.26

1.65

2.77

-

-

-

3.68

3.68

3.68

-

5.08

5.08

5.08

-

10.16

50

2

60.32

1.65

2.77

-

-

-

3.91

3.91

3.91

-

5.54

5.54

5.54

-

11.07

65

2 1/2

73.02

2.11

3.05

-

-

-

5.16

5.16

5.16

-

7.01

7.01

7.01

-

14.02

80

3

88.9

2.11

3.05

-

-

-

5.49

5.49

5.49

-

7.62

7.62

7.62

-

15.24

90

31/2

101.6

2.11

3.05

-

-

-

5.74

5.74

5.74

-

8.08

8.08

8.08

-

-

100

4

114.3

2.11

3.05

-

-

-

6.02

6.02

6.02

-

8.56

8.56

8.56

-

17.12

125

5

141.3

2.77

3.4

-

-

-

6.55

6.55

6.55

-

9.53

9.53

9.53

-

19.05

150

6

168.28

2.77

3.4

-

-

-

7.11

7.11

7.11

-

10.97

10.97

10.97

-

21.94

200

8

219.08

2.77

3.4

-

6.35

7.04

8.18

8.18

8.18

10.31

12.7

12.7

12.7

15.09

22.22

250

10

273.05

3.4

3.76

-

6.35

7.8

9.27

9.27

9.27

12.7

12.7

12.7

15.09

18.26

25.4

300

12

323.85

3.96

4.57

-

6.35

8.38

9.52

9.52

10.3

14.27

12.7

12.7

17.48

21.44

-

350

14

355.6

3.96

4.78

6.35

7.92

9.52

*9.52

9.52

11.13

15.09

12.7

12.7

19.05

23.83

-

400

16

406.4

4.19

4.78

6.35

7.92

9.52

*9.52

9.52

12.7

16.66

12.7

12.7

21.44

26.19

-

450

18

457.2

4.19

4.78

6.35

7.92

11.12

*9.52

9.52

14.27

19.05

12.7

12.7

23.82

29.36

-

500

20

508

4.78

5.54

6.35

7.92

12.7

*9.52

9.52

15.09

20.62

12.7

12.7

26.19

32.54

-

550

22

558.8

4.78

5.54

6.35

7.92

12.7

*9.52

9.52

-

22.22

12.7

12.7

28.58

34.92

-

600

24

609.6

5.54

6.35

6.35

7.92

14.27

*9.52

9.52

17.48

24.61

12.7

12.7

30.96

38.89

-

650

26

660.4

-

*7.92

7.92

12.7

-

*9.52

9.52

-

-

12.7

12.7

-

-

-

700

28

711.2

-

*7.92

7.92

12.7

15.88

*9.52

9.52

-

-

12.7

12.7

-

-

-

750

30

762

6.35

*7.92

7.92

12.7

15.88

*9.52

9.52

-

-

12.7

12.7

-

-

-

800

32

812

-

*7.92

7.92

12.7

15.88

*9.52

9.52

17.48

-

12.7

12.7

-

-

-

850

34

863.6

-

*7.92

7.92

12.7

15.88

*9.52

9.52

17.48

-

12.7

12.7

-

-

-

900

36

914.4

-

*7.92

7.92

12.7

15.88

*9.52

9.52

19.05

-

12.7

12.7

-

-

-

950

38

965.2

-

*7.92

-

-

-

*9.52

9.52

-

-

12.7

12.7

-

-

-

1000

40

1016

-

*7.92

-

-

-

*9.52

9.52

-

-

12.7

12.7

-

-

-

1050

42

1066.8

-

*7.92

-

-

-

*9.52

9.52

-

-

12.7

12.7

-

-

-

1100

44

1117.6

-

*7.92

-

-

-

*9.52

9.52

-

-

12.7

12.7

-

-

-

1150

46

1168.4

-

*7.92

-

-

-

*9.52

9.52

-

-

12.7

12.7

-

-

-

1200

48

1219.2

-

*7.92

-

-

-

*9.52

9.52

-

-

12.7

12.7

-

-

-

1300

52

1320.8

-

-

-

-

-

-

9.52

-

-

-

12.7

-

-

-

1350

54

1371.6

-

-

-

-

-

-

9.52

-

-

-

12.7

-

-

-

1400

56

1422.4

-

-

-

-

-

-

9.52

-

-

-

12.7

-

-

-

1500

60

1524

-

-

-

-

-

-

9.52

-

-

-

12.7

-

-


1600

64

1625.6

-

-

-

-

-

-

9.52

-

-

-

12.7

-

-


1700

68

1727.2

-

-

-

-

-

-

9.52

-

-

-

12.7

-

-


1800

72

1828.8

-

-

-

-

-

-

9.52

-

-

-

12.7

-

-


1900

76

1930.4

-

-

-

-

-

-

9.52

-

-

-

12.7

-

-


2000

80

2032

-

-

-

-

-

-

9.52

-

-

-

12.7

-

-



Standard of Carbon Seamless Steel Pipe

API 5L

for use in conveying gas, water, and oil in the natural gas and oil industries, and covers seamless and welded steel line pipe.

API 5CT

for casing and tubing

ASTM A53

for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

ASTM A106

for Seamless Carbon Steel Pipe for High-Temperature Service

ASTM A179

for Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes

ASTM A192

for Seamless Carbon Steel Boiler Tubes for High-Pressure Service

ASTM A213

for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes

ASTM A252

for Welded and Seamless Steel Pipe Piles

ASTM A333

for Seamless and Welded Steel Pipe for Low-Temperature Service and Other Applications with Required Notch Toughness

ASTM A672

for Electric-Fusion-Welded Steel Pipe for High-Pressure Service at Moderate Temperatures

ASTM A335

for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service

DIN 17175

seamless steel pipes are used in boiler installations, high-pressure pipelines and tank construction and special machinery for both high temperature and high-pressure devices.

DIN 1629

specifies the Seamless Circular Tubes of Non Alloys Steels with Special Quality Requirements.

DIN 2391

for Cold Drawn High Precision Seamless Tube

DIN 2458

Welded Steel Pipes in Unalloyed and Low Alloy Steels for Supply Purposes

EN 10210

Seamless steel tubes for pressure purposes

BS 3059

Steel boiler and superheater tubes

JIS G3454

Carbon steel pipes for pressure service





Manufacturing Process of Carbon Seamless Steel Pipe

carbon seamless steel pipe

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