Welded Steel Pipe

Welded Steel Pipe is with a seam on the surface of a steel strip or steel plate that is bent and deformed into a circular shape or a square shape. The inner wall of the welded pipe has welding ribs. The main products include: ERW steel pipe, LSAW steel pipe and SSAW steel pipe. Steel pipe is a kind of hollow long steel, which is used as a conduit for conveying fluids, such as oil, natural gas, water, gas, steam, etc.

Typical production process:

strip raw material → raw material pretreatment → cold bending forming → welding → weld heat treatment → weld (tube body) flaw detection → finishing → finished welded pipe
A. According to the process — arc welded pipe, resistance welded pipe (High frequency, low frequency), gas welded pipe, furnace welded pipe
B. According to the welds — straight seam welded pipe, spiral welded pipe

API SPEC 5L
Product NameExecutive StandardDimension (mm)Steel Code / Steel Grade
Line PipesAPI 5LØ60.3~273.1 x WT2.77~12.7A25, A, B, X42, X46, X52, X56, X60, X65, X70, X80

 

ASTM / ASME
Product NameExecutive StandardDimension (mm)Steel Code / Steel Grade
Electric-Resistance-Welded Steel PipesASTM A135Ø42.2~114.3 x WT2.11~2.63A
ERW and Hot-dip Galvanized Steel PipesASTM A53Ø21.3~273 x WT2.11~12.7A, B
Pipes for Piling UsageASTM A252Ø219.1~508 x WT3.6~12.7Gr.2, Gr.3
Tubes for General Structural PurposeASTM A500Ø21.3~273 x WT2.11~12.7Gr.2, Gr.3
Square Pipes for General Structural PurposeASTM A50025 x 25~160 x 160 x WT1.2~8.0Carbon Steel

 

DIN
Product NameExecutive StandardDimension (mm)Steel Code / Steel Grade
Threaded Steel PipesDIN 2440Ø21~164 x WT2.65~4.85Carbon Steel

 

BS
Product NameExecutive StandardDimension (mm)Steel Code / Steel Grade
Screwed and Socketed Steel TubesBS 1387Ø21.4~113.9 x WT2~3.6Carbon Steel

 

EN
Product NameExecutive StandardDimension (mm)Steel Code / Steel Grade
Scaffolding PipesEN 39Ø48.3 x WT3.2~4Carbon Steel

 

JIS
Product NameExecutive StandardDimension (mm)Steel Code / Steel Grade
Carbon Steel Tubes for General Structure PurposeJIS G3444Ø21.7~216.3 x WT2.0~6.0Carbon Steel
Carbon Steel Tubes for Machine Structure PurposeJIS G3445Ø15~76 x WT0.7~3.0STKM11A, STKM13A
Carbon Steel Pipes for Ordinary PipingJIS G3452Ø21.9~216.3 x WT2.8~5.8Carbon Steel
Carbon Steel Pipes for Pressure ServiceJIS G3454Ø21.7~216.3 x WT2.8~7.1Carbon Steel
Carbon Steel Rigid Steel ConduitsJIS G8305Ø21~113.4 x WT1.2~3.5G16~G104, C19~C75, E19~E75
Carbon Steel Rectangular Pipes for General StructureJIS G346616 x 16~150 x 150 x WT0.7~6Carbon Steel

ERW pipes are manufactured from steel coils, that are uncoiled, cut, processed, welded, and tested. ERW pipes are available in sizes between 1/2″ and 20″, in carbon steel (most in ASTM A53) and stainless steel (ASTM A312).

Sizes: 

Out Diameter:1/2″-24″

Wall Thickness: 1.65-20mm

Length : 3-12m, or according to customer’s requirement
End : Plain End, Beveled End, Treaded

Standard:

ASTM 5L, ASTM A53, ASTM A178, ASTM A500/501, ASTM A691, ASTM A252, ASTM A672, EN 10217

Steel Grade:

API 5L: PSL1/PSL2  Gr.A, Gr.B, X42, X46, X52, X56, X60, X65, X70
ASTM A53: GR.A, GR.B
EN: S275, S275JR, S355JRH, S355J2H

GB: Q195, Q215, Q235, Q345, L175, L210, L245, L320, L360-L555

Uses:
For ERW Line Pipe
For ERW Casing 

For ERW Structure Tube
For High pressure and high temperature

Surface: Lightly oiled, Hot dip galvanized, Electro galvanized, Black, Bare, Varnish coating/Anti rust oil, Protective Coatings (Coal Tar Epoxy,  Fusion Bond Epoxy, 3-layers PE)
Packing: Plastic plugs in both ends, Hexagonal bundles of max. 2,000kg with several steel strips, Two tags on each bundle, Wrapped in waterproof paper, PVC sleeve, and sackcloth with several steel strips, Plastic caps.
Test: Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties (Flattening Test, Bending Test,  Hardness Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, NDT TEST ( ET TEST, RT TEST, UT TEST)

Small diameter erw steel pipe

Out diameterSch 5Sch 10Sch 40
InchmmThicknessKg/mtrThicknessKg/mtrThicknessKg/mtr
1/2″21.31.650.812.111.012.771.29
3/4″26.71.651.032.111.302.871.71
1″33.41.651.312.772.123.382.54
1 1/4″42.21.651.932.773.153.684.11
1 1/2″48.31.651.932.773.153.684.11
2″60.31.652.422.773.984.815.31
3″88.92.114.583.056.545.4911.45
3 1/2″101.62.115.253.057.525.7413.77
4″114.32.115.253.057.525.7413.77
5″141.32.779.503.4011.746.5522.10
6″168.32.7711.473.4014.047.1128.68
8″219.12.7714.993.7620.258.1843.16

ERW Pipe Manufacturering Process:

Straight seam high frequency welded pipe (ERW steel pipe) is formed by forming a hot-rolled coil through a forming machine. The skin effect and proximity effect of high-frequency current are used to heat and melt the edge of the pipe blank. Pressure welding is carried out under the action of a squeeze roller. Realize production. Welded steel pipes have simple production process, high production efficiency, many varieties and specifications, and less equipment, but their general strength is lower than seamless steel pipes.

The UOE  LSAW STEEL PIPE mill features the most advanced technology and process, achieves high production efficiency, stable product quality and is equipped with complete inspection equipment. UOE mill adopts U & O forming, the formed pipes are welded inside through five internal welding stations with three wires, and welded outside through four external welding stations with three wires. In accordance with different requirements of the customers, the welded pipe can be expanded either by mechanical or hydrostatic expand to improve dimensional accuracy, and eliminate residual stress.

Specifications

Outside Diameter 508mm- 1118mm (20″- 44″)
Wall Thickness: 6.0-25.4mm 1/4″-1″
Quality Standards: API、DNV、ISO、DEP、EN、ASTM、DIN、BS、JIS、GB、CSA
Length: 9-12.3m (30′- 40′)
Grades: API 5L A-X90,GB/T9711 L190-L625

JOCE SLAW STEEL PIPE  is large diameter longitudinal submerged arc welded (SAWL) pipe production line in China. The mill adopts progressive bending process, featuring evenly distributed forming stress, high uniformity of dimension, infinite sizes variation&wide poduct range, and high flexibility, etc.

Specifications

Outside Diameter:Φ406mm- 1626mm (16″ – 64″ )
Wall Thickness:6.0- 75mm (1/4″ – 3″ )
Quality Standards:API、DNV、ISO、DEP、EN、ASTM、DIN、BS、JIS、GB、CSA
Length:3-12.5m ( 10′- 41′ )
Grades:API 5L A-X100, GB/T9711 L190-L690

Sizes of LSAW Steel Pipe:

OD: 16″-72″

 

O.D.

W.T.

Length(m)

Inch

mm

Min.Yield Strength(Mpa)

Inch

mm

245(B)

290(X42)

360(X52)

415(X60)

450(X65)

485(X70)

555(X80)

16

406

6.0-14.0

6.0-13.0

6.0-12.0

6.0-11.0

6.0-10.5

6.0-10.0

6.0-9.0

6.0-12.3

18

457

6.0-15.0

6.0-14.0

6.0-13.0

6.0-12.0

6.0-11.5

6.0-11.0

6.0-10.0

6.0-12.3

20

508

6.0-16.0

6.0-15.0

6.0-14.0

6.0-13.0

6.0-12.5

6.0-12.0

6.0-11.0

6.0-12.3

22

559

6.0-17.0

6.0-16.0

6.0-15.0

6.0-14.0

6.0-13.5

6.0-13.0

6.0-12.0

6.0-12.3

24

610

6.0-18.0

6.0-17.0

6.0-16.0

6.0-15.0

6.0-14.5

6.0-14.0

6.0-13.0

6.0-12.3

26

660

6.0-19.0

6.0-18.0

6.0-17.0

6.0-16.0

6.0-15.0

6.0-15.0

6.0-14.0

6.0-12.3

28

711

6.0-20.0

6.0-19.0

6.0-18.0

6.0-17.0

6.0-16.5

6.0-16.0

6.0-15.0

6.0-12.3

30

762

7.0-21.0

7.0-20.0

7.0-19.0

7.0-18.0

7.0-17.5

7.0-17.0

7.0-16.0

6.0-12.3

32

813

7.0-22.0

7.0-21.0

7.0-20.0

7.0-19.0

7.0-18.5

7.0-18.0

7.0-17.0

6.0-12.3

34

864

7.0-23.0

7.0-22.0

7.0-21.0

7.0-20.0

7.0-19.5

7.0-19.0

7.0-18.0

6.0-12.3

36

914

8.0-24.0

8.0-23.0

8.0-22.0

8.0-21.0

8.0-20.5

8.0-20.0

8.0-19.0

6.0-12.3

38

965

8.0-25.0

8.0-24.0

8.0-23.0

8.0-22.0

8.0-21.5

8.0-21.0

8.0-20.0

6.0-12.3

40

1016

8.0-26.0

8.0-25.0

8.0-24.0

8.0-23.0

8.0-22.5

8.0-22.0

8.0-21.0

6.0-12.3

42

1067

8.0-26.0

8.0-25.0

8.0-24.0

8.0-23.0

8.0-22.5

8.0-22.0

8.0-21.0

6.0-12.3

44

1118

9.0-27.0

9.0-26.0

9.0-24.5

9.0-23.5

9.0-22.8

9.0-22.0

9.0-21.0

6.0-12.3

46

1168

9.0-27.0

9.0-26.0

9.0-24.0

9.0-23.5

9.0-22.8

9.0-22.0

9.0-21.0

6.0-12.3

48

1219

9.0-28.0

9.0-27.0

9.0-25.4

9.0-24.0

9.0-23.5

9.0-23.0

9.0-22.0

6.0-12.3

52

1321

9.0-28.0

9.0-27.0

9.0-25.4

9.0-24.2

9.0-23.5

9.0-23.0

9.0-22.0

6.0-12.3

56

1422

10.0-29.0

10.0-28.0

10.0-26.0

10.0-24.5

10.0-23.8

10.0-23.0

10.0-22.0

6.0-12.3

60

1524

10.0-29.0

10.0-28.0

10.0-26.0

10.0-24.5

10.0-23.8

10.0-23.0

10.0-22.0

6.0-12.3

64

1626

10.0-30.0

10.0-29.0

10.0-27.0

10.0-25.4

10.0-24.8

10.0-24.0

10.0-23.0

6.0-12.3

68

1727

10.0-30.0

10.0-29.0

10.0-27.0

10.0-25.4

10.0-24.8

10.0-24.0

10.0-23.0

6.0-12.3

72

1829

10.0-30.0

10.0-29.0

10.0-27.0

10.0-25.4

10.0-24.8

10.0-24.0

10.0-23.0

6.0-12.3

 

Tolerance of Outside Diameter and Wall Thickness of LSAW Steel Pipe

Types

Standard

SY/T5040-2000

SY/T5037-2000

SY/T9711.1-1977

ASTM A252

AWWA C200-97

API 5L PSL1

Tube end OD deviation

±0.5%D

±0.5%D

-0.79mm~+2.38mm

<±0.1%T

<±0.1%T

±1.6mm

Wall thickness

±10.0%T

D<508mm, ±12.5%T

-8%T~+19.5%T

<-12.5%T

-8%T~+19.5%T

5.0mm<t<15.0mm, ±0.11<=”” p=””></t<15.0mm,>

D>508mm, ±10.0%T

T≥15.0mm, ±1.5mm

Chemical Composition and Mechanical Properties of LSAW Steel Pipe

Standard

Grade

Chemical Composition(max)%

Mechanical Properties(min)

C

Mn

Si

S

P

Yield Strength(Mpa)

Tensile Strength(Mpa)

GB/T700-2006

A

0.22

1.4

0.35

0.050

0.045

235

370

B

0.2

1.4

0.35

0.045

0.045

235

370

C

0.17

1.4

0.35

0.040

0.040

235

370

D

0.17

1.4

0.35

0.035

0.035

235

370

GB/T1591-2009

A

0.2

1.7

0.5

0.035

0.035

345

470

B

0.2

1.7

0.5

0.030

0.030

345

470

C

0.2

1.7

0.5

0.030

0.030

345

470

BS En10025

S235JR

0.17

1.4

0.035

0.035

235

360

S275JR

0.21

1.5

0.035

0.035

275

410

S355JR

0.24

1.6

0.035

0.035

355

470

DIN 17100

ST37-2

0.2

0.050

0.050

225

340

ST44-2

0.21

0.050

0.050

265

410

ST52-3

0.2

1.6

0.55

0.040

0.040

345

490

JIS G3101

SS400

0.050

0.050

235

400

SS490

0.050

0.050

275

490

API 5L PSL1

A

0.22

0.9

0.03

0.03

210

335

B

0.26

1.2

0.03

0.03

245

415

X42

0.26

1.3

0.03

0.03

290

415

X46

0.26

1.4

0.03

0.03

320

435

X52

0.26

1.4

0.03

0.03

360

460

X56

0.26

1.1

0.03

0.03

390

490

X60

0.26

1.4

0.03

0.03

415

520

X65

0.26

1.45

0.03

0.03

450

535

X70

0.26

1.65

0.03

0.03

585

570

Spiral steel pipe (SSAW) is a spiral seam steel pipe made of strip steel coils as raw materials, often extruded and formed by automatic double-wire double-sided submerged arc welding. The spiral steel pipe feeds the strip steel into the welded pipe unit. After rolling by multiple rollers, the strip steel is gradually rolled up to form a round tube blank with an open gap. The reduction of the squeeze roller is adjusted to control the weld gap at 1~ 3mm, and make both ends of the welding joint flush.

Sizes:

Out diameter:219mm-3620mm

Wall thickness: 5mm-25.4mm

Length: 3m-12m

Standard and Classfication of SSAW Steel Pipe

Classfication

Standard

Main Products

Line Pipe

API 5L PSL1/2

Line pipe

Casing

API 5CT/    ISO 11960 PSL1

Steel pipe for use as casing or tubing for wells of petroleum and natural gas industries

Steel Pipe for Fluid ServiceASTM A53Black and hot-hipped galvanized welded and seamless steel pipe
BS EN10217-2Welded steel tybes for pressure purposes – delivery technical conditions – part2: Electric welded non- alloy and alloy steel tubes with specified elevated temperature properties
BS EN10217-5Welded steel tybes for pressure purposes – delivery technical conditions – part5: submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties
Steel Pipe for Ordinary StructureASTM A252Welded and seamless steel pipe piles
BS EN10219-1Cold formed welded structural hollow sections of non-alloy and fine grain steels – part1: Technical delivert conditions
BS EN10219-2Cold formed welded structural hollow sections of non-alloy and fine grain steels – part2: tolerances dimmsions and sectional properties

Tolerance of Outside Diameter and Wall Thickness

StandardTolerance of Pipe BodyTolerance of Pipe EndTolerance of Wall Thickness
Out DiameterToleranceOut DiameterTolerance
GB/T3091OD≤48.3mm≤±0.5OD≤48.3mm≤±10%
48.3<od≤273.1mm
</od≤273.1mm
≤±1.0%48.3<od≤273.1mm< span=””>
</od≤273.1mm<>
273.1<od≤508mm
</od≤508mm
≤±0.75%273.1<od≤508mm< span=””>
</od≤508mm<>
-0.8~+2.4
OD>508mm≤±1.0%OD>508mm-0.8~+3.2
GB/T9711.1OD≤48.3mm-0.79~+0.41OD≤73-12.5%~+20%
60.3<od≤457mm
</od≤457mm
≤±0.75%OD≤273.1mm-0.4~+1.5988.9≤OD≤457-12.5%~+15%
508<od≤941mm
</od≤941mm
≤±1.0%OD≥323.9-0.79~+2.38OD≥508-10.0%~+17.5%
OD>941mm≤±1.0%
GB/T9711.260<od≤610mm
</od≤610mm
±0.75%D~±3mm60<od≤610mm
</od≤610mm
±0.5%D~±1.6mm4mm<wt<25mm
</wt<25mm
±12.5%T~±15.0%T
610<od≤1430mm
</od≤1430mm
±0.5%D~±4mm610<od≤1430mm
</od≤1430mm
±0.5%D~±1.6mmWT≥25mm-3.00mm~+3.75mm
OD>1430mmOD>1430mm-10.0%~+17.5%
SY/T5037OD<508mm≤±0.75%OD<508mm≤±0.75%OD<508mm≤±12.5%
OD≥508mm≤±1.00%OD≥508mm≤±0.50%OD≥508mm≤±10.0%
API 5L PSL1/PSL2OD<60.3-0.8mm~+0.4mmOD≤168.3-0.4mm~+1.6mmWT≤5.0≤±0.5
60.3≤OD≤168.3≤±0.75%168.3<od≤610
</od≤610
≤±1.6mm5.0<wt<15.0
</wt<15.0
≤±0.1T
168.3<od≤610
</od≤610
≤±0.75%610<od≤1422
</od≤1422
≤±1.6mmT≥15.0≤±1.5
610<od≤1422
</od≤1422
≤±4.0mmOD>1422
OD>1422
API 5CTOD<114.3≤±0.79mmOD<114.3≤±0.79mm≤-12.5%
OD≥114.3-0.5%~1.0%OD≥114.3-0.5%~1.0%≤-12.5%
ASTM A53≤±1.0%≤±1.0%≤-12.5%
ASTM A252≤±1.0%≤±1.0%≤-12.5%

Chemical Analysis and Mechanical Properties of SSAW Steel Pipe

 

Standard

Grade

Chemical Composition(max)%

Mechanical Properties(min)

C

Si

Mn

P

S

Tensile Strength(Mpa)

Yield Strength(Mpa)

API 5CT

h40

0.030

417

417

J55

0.030

517

517

K55

0.300

655

655

API 5L PSL1

A

0.22

0.90

0.030

0.030

335

335

B

0.26

1.20

0.030

0.030

415

415

X42

0.26

1.30

0.030

0.030

415

415

X46

0.26

1.40

0.030

0.030

435

435

X52

0.26

1.40

0.030

0.030

460

460

X56

0.26

1.40

0.030

0.030

490

490

X60

0.26

1.40

0.030

0.030

520

520

X65

0.26

1.45

0.030

0.030

535

535

X70

0.26

1.65

0.030

0.030

570

570

API 5L PSL2

B

0.22

0.45

1.20

0.025

0.015

415

415

X42

0.22

0.45

1.30

0.025

0.015

415

415

X46

0.22

0.45

1.40

0.025

0.015

435

435

X52

0.22

0.45

1.40

0.025

0.015

460

460

X56

0.22

0.45

1.40

0.025

0.015

490

490

X60

0.12

0.45

1.60

0.025

0.015

520

520

X65

0.12

0.45

1.60

0.025

0.015

535

535

X70

0.12

0.45

1.70

0.025

0.015

570

570

X80

0.12

0.45

1.85

0.025

0.015

625

625

ASTM A53

A

0.25

0.10

0.95

0.050

0.045

330

330

B

0.30

0.10

1.20

0.050

0.045

415

415

ASTM A252

1

0.050

345

345

2

0.050

414

414

3

0.050

455

455

EN10217-1

P195TR1

0.13

0.35

0.70

0.025

0.020

320

320

P195TR2

0.13

0.35

0.70

0.025

0.020

320

320

P235TR1

0.16

0.35

1.20

0.025

0.020

360

360

P235TR2

0.16

0.35

1.20

0.025

0.020

360

360

P265TR1

0.20

0.40

1.40

0.025

0.020

410

410

P265TR2

0.20

0.40

1.40

0.025

0.020

410

410

EN10217-2

P195GH

0.13

0.35

0.70

0.025

0.020

320

320

P235GH

0.16

0.35

1.20

0.025

0.020

360

360

P265GH

0.20

0.40

1.40

0.025

0.020

410

410

EN10217-5

P235GH

0.16

0.35

1.20

0.025

0.020

360

360

P265GH

0.20

0.40

1.40

0.025

0.020

410

410

EN10219-1

S235JRH

0.17

1.40

0.040

0.040

360

360

S275JOH

0.20

1.50

0.035

0.035

410

410

S275J2H

0.20

1.50

0.030

0.030

410

410

S355JOH

0.22

0.55

1.60

0.035

0.035

470

470

S355J2H

0.22

0.55

1.60

0.030

0.030

470

470

S355K2H

0.22

0.55

1.60

0.030

0.030

470

470