Hot Expanded Seamless Steel Pipe

Forever Steel Manufacturing Co., Ltd
hot expanded seamless steel pipe,hot expanded pipe,large diameter seamless pipe,hot expansion pipe,API 5L seamless pipe

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Hot Expanded Seamless Steel Pipe

Hot Expanded Smls Pipes
Large diameter hot expanded seamless steel pipe API 5L for oil gas line
Induction heating hot expansion seamless pipe with thick wall thickness
Hot expanded SMLS pipe stack with black coating and beveled ends
Tubería sin costura expandida en caliente de gran diámetro para proyectos

Product Category: Hot Expanded Pipe, Large Diameter Seamless Pipe, Hot Expanding Steel Pipe, Heavy Wall Seamless Pipe, Carbon Steel Hot Expanded Pipe, Customized SMLS Pipe.

Outer Diameter (OD): 219mm – 914.4mm (8" to 36")

Wall Thickness (WT): 6mm – 60mm

Length: 5.8mtr – 12mtr (Fixed or random lengths)

Process Advantage: Provides a cost-effective solution for large-diameter pipes that cannot be directly produced by standard hot rolling.

Technical Standards & Grades:

Line Pipe Standard: API 5L (Grades B, X42, X46, X52, X56, X60, X65 PSL1/PSL2)

Structural Standard: ASTM A53 (Grade B), ASTM A106 (Grade B, C), EN 10210 (S235JR, S355JR, S355J2H)

Boiler & Pressure: ASTM A192, ASTM A210, EN 10216-1

End Finish:Beveled Ends/Plain Ends/Victaulic Grooved Ends

Surface Treatment:

Anti-Corrosion: Black Painting/Varnish, Anti-rust oil

Coating: 3PE, FBE (Fusion Bonded Epoxy), Liquid Epoxy Coating, Galvanized (Hot Dipped)

Packing:In loose pieces (for large diameters)Nylon slings or thick ropes provided for easy loading/unloadingSteel bands for smaller diameter bundles /End protectors/Plastic caps to prevent contamination

  • Overview
  • Specification
  • Standard
  • Process
  • Packing

Hot Expanded Seamless Steel Pipe–Large Diameter & High-Efficiency Solutions

Our Hot Expanded Seamless Steel Pipes provide a cost-effective alternative for projects requiring large-diameter piping without the high cost of traditional large-billet seamless manufacturing. By utilizing a specialized thermal-mechanical expansion process, we transform standard seamless mother pipes into larger diameters while maintaining structural integrity and meeting strict international engineering standards.


Common Standards and Steel Grades

We supply hot expanded pipes across a wide range of carbon and alloy grades to ensure compatibility with your project's specific pressure and temperature requirements:

ASTM A106 / ASME SA106: Grades B and C for high-temperature service.

ASTM A53: Grades A and B for general mechanical and pressure applications.

API 5L: Pipeline steel for oil and gas (Grades B, X42, X46, X52, X56, X60).

ASTM A335: Alloy steel grades for high-temp power generation (P11, P22, P91).

EN 10210 / EN 10219: Hot finished structural hollow sections (S235JR, S355JR).


Dimensional Range & Specifications

The hot expansion process is the ideal choice for large-bore piping where standard seamless production is limited:

Feature

Specification Range

Outer Diameter (OD)

10” to 48” (273.1mm – 1219mm)

Wall Thickness (WT)

SCH 20, SCH 40, SCH 80, SCH STD (up to 40mm)

Length

Single Random (5.8m), Double Random (11.8m), or Custom Cut

Tolerance

Strictly per ASTM A530 or API 5L (OD ±1%, WT ±12.5%)

End Finish

Beveled Ends (30°±5°), Plain Ends, or Special Threading


Core Application Fields

Hot expanded pipes are widely utilized in heavy-duty infrastructure and energy sectors where large-volume fluid transport is required:

Oil & Gas Midstream: Large-diameter transmission pipelines for crude oil and natural gas.

Structural Engineering: Bridge piling, offshore platform legs, and stadium frameworks.

Water Conservancy: Main water supply lines and high-pressure drainage systems.

Thermal Power Plants: Low-pressure steam lines and cooling water circulation.

Petrochemical Industry: Large-scale refinery piping and storage tank connections.

Technical Parameters of Hot Expanded Seamless Steel Pipe

Nominal size Outside Nominal Wall Thickness (mm)
Diameter
DN NPS OD(MM) SCH SCH SCH STD SCH SCH XS SCH SCH SCH SCH SCH XXS
10 20 30 40 60 80 100 120 140 160

200

250

300

8

10

12

219.1

273.1

323.9

3.76

4.19

4.57

6.35

6.35

6.35

7.04 

7.80

8.38

8.18 9.27 9.53

8.18

9.27 10.31

10.31 12.70 14.27 12.70 12.70 12.70 12.70 15.09 17.48 15.09 18.26 21.44 18.26 21.44 25.40 20.62 25.40 28.58 23.01 28.58 33.32 22.23 25.40 25.40

350

400

450

14

16

18

355.6

406.4

457.2

6.35

6.35

6.35

7.92

7.92

7.92

9.53

9.53 11.13

9.53 9.53 9.53 11.13 12.70 14.27 15.09 16.66 19.05 12.70 12.70 12.70 19.05 21.44 23.83 23.83 26.19 29.36 27.79 30.96 34.93 31.75 36.53 39.67 35.71 40.49 45.24 — —

500

550

600

20

22

24

508

559

610

6.35

6.35

6.35

9.53

9.53

9.53

12.70 12.70 14.27 9.53 9.53 9.53

15.09

17.48

20.62 22.23 24.61 12.70 12.70 12.70 26.19 28.58 30.96 32.54 34.93 38.89 38.10 41.28 46.02 44.45 47.63 52.37 50.01 53.98 59.54 — —

500

550

600

20

22

24

508

559

610

6.35

6.35

6.35

9.53

9.53

9.53

12.70 12.70 14.27 9.53 9.53 9.53

15.09

— 

17.48

20.62 22.23 24.61 12.70 12.70 12.70 26.19 28.58 30.96 32.54 34.93 38.89 38.10 41.28 46.02 44.45 47.63 52.37 50.01 53.98 59.54 — —

660

700

750

26

28

30

660

711

762

7.92

7.92

7.92

12.70 12.70 12.70

15.88 15.88

9.53 9.53 9.53

— — 12.70 12.70 12.70 — — — — — — — — — — — —

800

850

900

32

34

36

813

864

914

7.92

7.92 7.92

12.70 12.70 12.70 15.88 15.88 15.88 9.53 9.53 9.53 17.48 17.48 19.05 — — 12.70 12.70 12.70 — — — — — — — — — — — —

Hot Expanded Seamless Pipe Production Process

Technical Parameters of Hot Expanded Seamless Steel Pipe

Nominal size Outside Nominal Wall Thickness (mm)
Diameter
DN NPS OD(MM) SCH SCH SCH STD SCH SCH XS SCH SCH SCH SCH SCH XXS
10 20 30 40 60 80 100 120 140 160

200

250

300

8

10

12

219.1

273.1

323.9

3.76

4.19

4.57

6.35

6.35

6.35

7.04 

7.80

8.38

8.18 9.27 9.53

8.18

9.27 10.31

10.31 12.70 14.27 12.70 12.70 12.70 12.70 15.09 17.48 15.09 18.26 21.44 18.26 21.44 25.40 20.62 25.40 28.58 23.01 28.58 33.32 22.23 25.40 25.40

350

400

450

14

16

18

355.6

406.4

457.2

6.35

6.35

6.35

7.92

7.92

7.92

9.53

9.53 11.13

9.53 9.53 9.53 11.13 12.70 14.27 15.09 16.66 19.05 12.70 12.70 12.70 19.05 21.44 23.83 23.83 26.19 29.36 27.79 30.96 34.93 31.75 36.53 39.67 35.71 40.49 45.24 — —

500

550

600

20

22

24

508

559

610

6.35

6.35

6.35

9.53

9.53

9.53

12.70 12.70 14.27 9.53 9.53 9.53

15.09

17.48

20.62 22.23 24.61 12.70 12.70 12.70 26.19 28.58 30.96 32.54 34.93 38.89 38.10 41.28 46.02 44.45 47.63 52.37 50.01 53.98 59.54 — —

500

550

600

20

22

24

508

559

610

6.35

6.35

6.35

9.53

9.53

9.53

12.70 12.70 14.27 9.53 9.53 9.53

15.09

— 

17.48

20.62 22.23 24.61 12.70 12.70 12.70 26.19 28.58 30.96 32.54 34.93 38.89 38.10 41.28 46.02 44.45 47.63 52.37 50.01 53.98 59.54 — —

660

700

750

26

28

30

660

711

762

7.92

7.92

7.92

12.70 12.70 12.70

15.88 15.88

9.53 9.53 9.53

— — 12.70 12.70 12.70 — — — — — — — — — — — —

800

850

900

32

34

36

813

864

914

7.92

7.92 7.92

12.70 12.70 12.70 15.88 15.88 15.88 9.53 9.53 9.53 17.48 17.48 19.05 — — 12.70 12.70 12.70 — — — — — — — — — — — —

Hot Expanded Seamless Pipe Production Process

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