Large Diameter ERW Steel Pipe OD 219mm-660mm Industrial Pipeline

Item

Details

Product Name

Large Diameter ERW Steel Pipe OD 219mm-660mm Industrial Pipeline

Production Process

Electric Resistance Welded (ERW) - High-frequency resistance welding, continuous forming, strict dimensional control

Outer Diameter Range

219 mm - 660mm

Wall Thickness Range

5 mm - 25mm

Length

Fixed length: 6m, 12m; Random length: 5.8m-12m; Customized length available

Material Grade

Carbon steel: Q235, Q345, S235JR, S355JR, A53 Gr. B, A106 Gr. B, API 5L Gr. B, X42, X46, X52, X60, X65, X70

Standard Compliance

API 5L, ASTM A53, ASTM A106, EN 10217, GB/T 3091, GB/T 9711

Application

Industrial fluid transmission, oil & gas pipeline, water supply & drainage, heating engineering, chemical industry, power plant, structural engineering

Outer Diameter (OD)

Tolerance

Wall Thickness (WT)

Tolerance

Length Tolerance

219 mm-355mm

±0.75% OD

5 mm-12mm

±10% WT

0mm / +20mm

377 mm-530mm

±0.80% OD

8 mm-18mm

±10% WT

0mm / +20mm

550 mm-660mm

±1.00% OD

10 mm-25mm

±12.5% WT

0mm / +20mm

Material Grade

Yield Strength (Min)

Tensile Strength (Min)

Elongation (Min)

Impact Test

Q235 / A53 Gr. B

235 MPa

370 MPa

24%

Optional

Q345 / S355JR

345 MPa

470 MPa

22%

Optional

API 5L Gr. B

241 MPa

414 MPa

23%

Standard

API 5L X42-X70

290-485 MPa

414-565 MPa

20%-22%

Standard

Grade

C (Max)

Si

Mn

P (Max)

S (Max)

A53 Gr. B / API 5L Gr. B

0.3

0.10-0.35

0.29-1.06

0.05

0.045

Q235

0.22

≤ 0.35

≤ 1.40

0.045

0.045

Q345

0.2

≤ 0.55

≤ 1.70

0.035

0.035

X42-X70

0.12-0.20

0.15-0.45

1.00-1.60

0.025

0.015

Process Stage

Control Measures & Standards

Raw Material Inspection

Chemical composition analysis, mechanical property test, surface defect detection

Forming Process

Continuous cold forming, roll design optimization, consistent roundness

Welding Process

High-frequency resistance welding, online temperature monitoring, no filler metal

Weld Seam Treatment

Internal & external weld bead removal, smooth transition, full penetration guarantee

Heat Treatment

Normalizing / Stress relief (optional, per requirement)

Dimensional Check

OD, WT, length, straightness, ovality - 100% online measurement

Non-Destructive Testing

Ultrasonic testing (UT), Eddy current testing (ET), Hydrostatic test (100% pressure test up to 10-50 MPa)

Surface Inspection

Visual check for cracks, scratches, dents; wall thickness uniformity verification

Treatment Type

Description

Application Scenario

Bare / Black Varnish

Mill finish, light oil coating for temporary anti-rust

General industrial use, internal transmission

Hot-Dip Galvanized

Zinc coating 85-100μm, excellent corrosion resistance

Water supply, outdoor pipeline, civil engineering

Epoxy Coating

Fusion bonded epoxy (FBE), thickness 300-600μm

Oil & gas, chemical, high corrosion environment

3PE / 3PP Coating

Polyethylene / polypropylene three-layer structure, long-term protection

Buried pipeline, marine engineering, long-distance transmission

Anti-Corrosion Paint

Coal tar epoxy, asphalt paint, customized coating

Underground drainage, sewage treatment

End Type

Specification

Usage

Plain End (PE)

Deburred, square cut

Butt welding, socket connection

Beveled End (BE)

30°±5° bevel, 1.6mm±0.8mm root face

High-pressure welding, long-distance pipeline

Threaded End

NPT / BSP thread, with coupling

Low-pressure, small-diameter branch connection

Grooved End

Standard groove for mechanical coupling

Fast installation, fire protection system

Item

Details

Packaging

Standard export packaging: Bundled with steel strips, covered with waterproof plastic or woven cloth; Customized packaging available

Marking

Permanent marking: Product name, standard, material grade, OD × WT × Length, batch number, manufacturer logo, inspection stamp

Documents

Mill test report (MTR), material certificate, inspection report, packing list, commercial invoice, certificate of origin