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Jan 27, 2026 Leave a message

ERW Steel Pipe & ERW Casing

Types

ERW Steel Pipe(Electric Resistance Welded Pipe), A53 ERW Pipe, ERW Casing, ERW Carbon Steel Pipe, Galvanized ERW Pipe, Stainless Steel ERW Pipe, ERW Structural Pipe

 

Sizes:erw steel pipe

OD (Out Diameter): 21.3-660mm
WT (Wall Thickness): 1.0-20mm or sch5, sch10, sch40, sch80, st, xs

 

Standard:

For ERW pipe

ASTM A53 GR.B, ASTM A135, ASTM A178, ASTM A252

API 5L X42/46/52/56/60/70

ASTM A500, ASTM A513, ASTM A36

EN 10204/10217 S235JR,S275JR, S355,S355JR,S355J2H

 

For EFW pipe

Carbon steel efw pipe: ASTM A671, ASTM A672

Stainless steel erw pipe: ASTM A312

Alloy steel efw pipe: ASTM A691

 

Coating

3PE Coating 3PP Coating FBE Coating Epoxy Coating Special Painting

 

Uses:

For ERW Line Pipe

For ERW Casing

For ERW Structure Tube

For High pressure and High temperature

 

ERW Pipe

Tolerance of Outside Diameter

Standard Out Diameter Tolerance of Pipe End Tolerance of Pipe Body
API 5L

219.1～273.1

 +1.6mm, -0.4mm ±0.75%
274.0～320 +2.4mm, -0.8mm ±0.75%
323.9～457 +2.4mm, -0.8mm ±0.75%
508 +2.4mm, -0.8mm ±0.75%
559～610 +2.4mm, -0.8mm ±0.75%

 

Tolerance of Wall Thickness

Standard Grade Out Diameter Wall Thickness
API 5L A 219.1～457 +15%, -12.5%
B 508～610 +17.5%, -12.5%
X42-X80 508～610 +19.5%, -8%

 

Chemical Analysis and Mechanical Properties

Standard Class Grade Chemical Analysis(%) Mechanical Properties(min)(Mpa)
C Mn P S Tensile Strength Yield Strength
API 5L PSL1 B 0.26 1.20 0.030 0.030 414 241
X42 0.26 1.30 0.030 0.030 414 290
X46 0.26 1.40 0.030 0.030 434 317
X52 0.26 1.40 0.030 0.030 455 359
X56 0.26 1.40 0.030 0.030 490 386
X60 0.26 1.40 0.030 0.030 517 414
X65 0.26 1.45 0.030 0.030 531 448
X70 0.26 1.65 0.030 0.030 565 483
PSL2 B 0.22 1.20 0.025 0.015 414 241
X42 0.22 1.30 0.025 0.015 414 290
X46 0.22 1.40 0.025 0.015 434 317
X52 0.22 1.40 0.025 0.015 455 359
X56 0.22 1.40 0.025 0.015 490 386
X60 0.22 1.40 0.025 0.015 517 414
X65 0.22 1.45 0.025 0.015 531 448
X70 0.22 1.65 0.025 0.015 565 483
X80 0.22 1.85 0.025 0.015 621 552

 

ERW Pipe Manufacturing Process:

 

High-frequency straight seam electric-resistance welded steel pipe(erw steel pipe) is hot-rolled coil after forming machine, the use of high-frequency current skin effect and proximity effects, the tube edge heating and melting, squeeze roller under pressure welding to achieve production.

High-frequency resistance welding steel pipe, welding pipe and ordinary welding process is not the same, the weld is made of the base metal melt from the body, the mechanical strength is better than the general pipe. Smooth appearance, high precision, low cost weld high and small, favorable 3PE anti-corrosion coating. There are significant differences in the welding methods between high frequency welded pipe and submerged arc welded pipe. As the welding is done instantly at high speed, the difficulty of ensuring the quality of welding is much higher than that of submerged arc welding.

 

ERW Steel Pipe Manufacturing Process

 

 

ERW Casing

Standard: API SPEC 5CT

Application: Casing serves as wall of well

 

Specification

OD

WT

End Type

inch

mm

inch

mm

Grade

J55

M65

N80/L80-1

P110

K55

8 5/8

219.08

0.304

7.72

-

PS

-

-

0.352

8.94

PSLB

PSLB

-

-

0.400

10.16

PSLB

PSLB

PLB

PLB

0.450

11.43

-

PLB

PLB

PLB

0.500

12.70

-

-

PLB

PLB

9 5/8

244.48

0.352

8.94

PSLB

PSLB

-

-

0.395

10.03

PSLB

PSLB

PLB

PLB

0.435

11.05

-

PLB

PLB

PLB

0.472

11.99

-

PLB

PLB

PLB

0.545

13.84

-

-

PLB

PLB

10 3/4

273.05

0.350

8.89

PSB

PSB

-

-

0.400

10.16

PSB

PSB

-

-

0.450

11.43

PSB

PSB

PSB

PSB

0.500

12.57

-

PSB

PSB

PSB

0.545

13.84

-

-

-

PSB

13 3/8

339.72

0.380

9.65

PSB

PSB

-

-

0.430

10.92

PSB

PSB

-

-

0.480

12.19

PSB

PSB

PSB

PSB

0.514

13.06

-

-

PSB

PSB

16

406.40

0.438

11.13

PSB

-

-

-

0.495

12.57

PSB

-

-

-

0.656

16.66

P

-

-

-

18 5/8

473.08

0.435

11.05

PSB

-

-

-

20

508

0.438

11.13

PSLB

-

-

-

0.500

12.70

PSLB

-

-

-

0.635

16.13

PSLB

--

-

-

 

Dimensional Tolerance

Standard

Tolerance of O.D.

Tolerance of W.T.

Straightness of Pipe Body

Straightness of Pipe End

Tolerance for Weight

API 5CT

+1%, -0.5%

-12.5%

≤0.2%L

≤3.18mm

+6.5%, -3.5%

 

Mechanical Properties

Standard

Grade

Yield Strength(Mpa)

Tensile Strength(Mpa)

Hardness(HRC)

Impact Energy(J)(min)

Impact Temperature(℃)

API 5CT

J55

379-552

≥517

-

T-10-20(SR16)

21

K55

379-552

≥655

-

L-10-27(SR16)

M65

448-586

≥586

≤22

T-10-20, L-10-41

C19-20, C76-77(SR16)

0

L80

552-655

≥655

≤23

N80

552-758

≥689

-

P110

758-965

≥862

-

 

Chemical Composition(%)

Standard

Grade

C

Mn

P

S

Ni

Cu

Si

API 5CT

J55

-

-

≥0.030

≥0.030

-

-

-

K55

-

-

≥0.030

≥0.030

-

-

-

M65

-

-

≥0.030

≥0.030

-

-

-

L80

≥0.43

≥1.90

≥0.030

≥0.030

≥0.25

≥0.35

≥0.45

N80

-

-

≥0.030

≥0.030

-

-

-

P110

-

-

≥0.030

≥0.030

-

-

-

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