Hot-DIP Galvanized Round Steel Pipe For Outdoor Structures And Fence Posts

Item

Available Range / Option

Product

Hot-dip galvanized round steel pipe / steel tube

Base Pipe Route

ERW welded round pipe as the main direction

Main Grade

Q235

Higher-Strength Option

Q355

BS EN Structural Options

S275 / S355 with complete grade suffix under the applicable standard

Nominal Size

1/2 inch–16 inches

Actual Outside Diameter

21.3–406.4 mm

Wall Thickness

According to the confirmed size and selected product standard

Length

According to the confirmed order requirement

Surface Route

Hot-dip galvanized after pipe forming

Section

Round / circular hollow section

Base End Condition

Plain end

Packing

Steel bundles; wrapping, labels and end protection by order

Main Applications

Outdoor posts, fence posts and rails, supports, construction components and fabricated tubular parts

NOMINAL SIZE

Actual Outside Diameter

Wall Thickness

Available Length

NPS/inch

DN

mm

mm

m

1/2"

15

21.3

1.5-3.00

1-12

3/4"

20

26.9

1.5-3.25

1-12

1"

25

33.7

1.5-4.25

1-12

1.1/4"

32

42.4

1.5-4.50

1-12

1.1/2"

40

48.3

1.5-4.75

1-12

2"

50

60.3

1.5-7.00

1-12

2.1/2"

65

76.1

1.8-7.50

1-12

3"

80

88.9

1.8-9.75

1-12

4"

100

114.3

1.8-11.75

1-12

5"

125

139.7

1.8-11.75

1-12

6"

150

168.3

1.8-13.00

1-12

8"

200

219.1

1.8-13.75

1-12

10"

250

273.9

1.8-13.75

1-12

12"

300

323.9

3.0-16.00

1-12

14"

350

355.6

3.0-16.00

1-12

16"

400

406.4

5.0-16.00

1-12

Grade Direction

Supply Position

Typical Purchasing Logic

Main Confirmation Points

Q235

Main conventional grade

General outdoor posts, fence rails, supports, frames and fabricated components

Product standard, dimensions, application and documents

Q355

Higher-strength structural option

Structural circular tube, posts and supports requiring a higher strength level

Full grade designation, base-pipe standard, tolerances and MTC

S275

BS EN structural option

Singapore and other BS EN / Eurocode-based structural hollow-section projects

EN 10219 or EN 10210 route, full suffix and project documents

S355

Higher-strength BS EN structural option

Higher-strength structural hollow-section requirements

Full suffix, manufacturing condition, FPC/MTC and project specification

Q275

Separate Chinese GB route

Orders that explicitly require the applicable Chinese grade

Product standard, documents and project acceptance route

ASTM Grade A / B

ASTM A53 route

Black or hot-dip galvanized pipe ordered to ASTM A53

NPS, wall, manufacturing method and test requirements

Size Direction

Typical Component Direction

Main Selection Focus

1/2 inch–2 inches

Small posts, rails, braces, connection parts and threaded components

Actual OD, wall thickness, end condition, connection method and product standard

2 1/2 inches–6 inches

Fence posts, outdoor supports, frame members and larger rails

Height, spacing, wall thickness, connection, exposure and processing

8 inches–16 inches

Large-diameter components, project pipe and fabricated tubular parts

Actual use, wall thickness, length, weight, galvanizing feasibility and transport

Inspection Area

Typical Checks

Base-Pipe Checks

Actual outside diameter,Wall thickness,Length,Straightness,Pipe-end condition,Weld-seam condition where applicable

Galvanized-Surface Checks

Overall visible surface,External and accessible internal appearance,Zinc runs and rough areas,Drainage condition,
Local uncovered or damaged areas,Handling and storage marks

Coating Checks

Coating mass,Coating thickness,Measurement method,Inspection frequency,Average and local requirements,
Third-party inspection

Processed-Part Checks

Cut length,Hole size and location,Thread or groove,Attached plates or brackets,Item identification,Quantity by drawing number

Packing

Steel bundle packing,Waterproof wrapping when agreed,End protection,Labels and shipping marks,Sorted bundles,Large-diameter loading arrangements