Q355B & S355JR Galvanized Square Rectangular Steel Pipe | GB/T 6728 EN 10219 Hollow Section

Galvanized Square/Rectangular Steel Pipe

Q355B & S355JR Galvanized Square Rectangular Steel Pipe | GB/T 6728 EN 10219 Hollow Section

  1. High yield & tensile strength, designed for heavy-load structural engineering
  2. Manufactured to GB/T 6728 and EN 10219 standards for global project acceptance
  3. Hot-dip galvanized coating delivers reliable long-term anti-corrosion performance outdoors
  4. Excellent impact resistance and good weldability for fabrication and cutting
  5. Precise dimensional tolerance, stable mechanical performance for infrastructure
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Product Overview

Our Q355B & S355JR galvanized square and rectangular steel pipe is hot-dip galvanized hollow section manufactured in compliance with GB/T 6728 and EN 10219 standards. The base material adopts Q355B and S355JR carbon steel grades, then undergoes hot-dip galvanization to form a dense zinc protective layer on the steel surface.

Both grades feature high mechanical strength. Q355B is the Chinese standard grade under GB/T 6728, while S355JR follows EN 10219 European standard, with nearly matching strength properties for heavy-duty applications. This galvanized hollow section is widely used for load-bearing structures, heavy engineering supports, outdoor building frames, solar mounting structures, highway guardrails and large infrastructure projects. Uniform zinc coating ensures great corrosion resistance in humid and outdoor environments. Custom cutting and length options are available to satisfy different project requirements.

Galvanized Square/Rectangular Steel Pipe

Chemical & Mechanical Property Snapshot

Property Item Q355B S355JR
Standard GB/T 6728 EN 10219
Yield Strength Min (MPa) 355 355
Tensile Strength (MPa) 470-630 470-630
C ≤ (%) ≤0.20 ≤0.22
Mn ≤ (%) ≤1.60 ≤1.60
Si ≤ (%) ≤0.50 ≤0.55
P ≤ (%) ≤0.035 ≤0.035
S ≤ (%) ≤0.035 ≤0.035
Elongation A (%) ≥21 ≥21

Detailed Technical Specifications

Specification Item Details
Product Name Galvanized Square / Rectangular Steel Pipe
Steel Grade Q355B, S355JR
Execution Standard GB/T 6728, EN 10219
Production Process Welded tube + Hot Dipped Galvanized
Zinc Coating Weight 60-275 g/m²
Wall Thickness 1.2mm – 16mm
Outer Dimension (Square) 10×10mm ~ 400×400mm
Outer Dimension (Rectangular) 20×10mm ~ 500×300mm
Length 5.8m / 6m / 11.8m or custom cut length
Surface Hot-dip galvanized, silver bright surface
MOQ 5 Tons
Lead Time 7–15 working days after deposit
Payment Terms T/T, L/C at sight
Package Bundled with steel strips, export standard packing

Dimension Section

Type Cross Section Size (mm) Available Wall Thickness (mm) Standard Length Custom Cut Length
SHS Square Hollow Section 10×10 0.8, 1.2, 1.5, 2.0, 2.5, 3.0 6 m / 12 m 1–12 m
SHS Square Hollow Section 15×15 0.8, 1.2, 1.5, 2.0, 2.5, 3.0 6 m / 12 m 1–12 m
SHS Square Hollow Section 20×20 0.8, 1.2, 1.5, 2.0, 2.5, 3.0, 4.0 6 m / 12 m 1–12 m
SHS Square Hollow Section 25×25 0.8, 1.2, 1.5, 2.0, 2.5, 3.0, 4.0 6 m / 12 m 1–12 m
SHS Square Hollow Section 30×30 0.8, 1.2, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0 6 m / 12 m 1–12 m
SHS Square Hollow Section 40×40 1.2, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 6 m / 12 m 1–12 m
SHS Square Hollow Section 50×50 1.2, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 8.0 6 m / 12 m 1–12 m
SHS Square Hollow Section 60×60 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 8.0 6 m / 12 m 1–12 m
SHS Square Hollow Section 80×80 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 8.0, 10.0 6 m / 12 m 1–12 m
SHS Square Hollow Section 100×100 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 8.0, 10.0, 12.0 6 m / 12 m 1–12 m
SHS Square Hollow Section 120×120 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 8.0, 10.0, 12.0 6 m / 12 m 1–12 m
SHS Square Hollow Section 150×150 2.5, 3.0, 4.0, 5.0, 6.0, 8.0, 10.0, 12.0, 16.0 6 m / 12 m 1–12 m
SHS Square Hollow Section 200×200 3.0, 4.0, 5.0, 6.0, 8.0, 10.0, 12.0, 16.0 6 m / 12 m 1–12 m
SHS Square Hollow Section 250×250 4.0, 5.0, 6.0, 8.0, 10.0, 12.0, 16.0 6 m / 12 m 1–12 m
SHS Square Hollow Section 300×300 4.0, 5.0, 6.0, 8.0, 10.0, 12.0, 16.0 6 m / 12 m 1–12 m
SHS Square Hollow Section 400×400 5.0, 6.0, 8.0, 10.0, 12.0, 16.0 6 m / 12 m 1–12 m
SHS Square Hollow Section 500×500 6.0, 8.0, 10.0, 12.0, 16.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 20×10 0.8, 1.2, 1.5, 2.0, 2.5, 3.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 30×20 0.8, 1.2, 1.5, 2.0, 2.5, 3.0, 4.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 40×20 1.2, 1.5, 2.0, 2.5, 3.0, 4.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 40×30 1.2, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 50×25 1.2, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 50×30 1.2, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 60×40 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 80×40 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 8.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 80×60 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 8.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 100×50 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 8.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 100×80 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 8.0, 10.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 120×60 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 8.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 150×100 2.5, 3.0, 4.0, 5.0, 6.0, 8.0, 10.0, 12.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 200×100 2.5, 3.0, 4.0, 5.0, 6.0, 8.0, 10.0, 12.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 250×150 3.0, 4.0, 5.0, 6.0, 8.0, 10.0, 12.0, 16.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 300×200 3.0, 4.0, 5.0, 6.0, 8.0, 10.0, 12.0, 16.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 400×200 4.0, 5.0, 6.0, 8.0, 10.0, 12.0, 16.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 500×300 5.0, 6.0, 8.0, 10.0, 12.0, 16.0 6 m / 12 m 1–12 m
RHS Rectangular Hollow Section 600×400 6.0, 8.0, 10.0, 12.0, 16.0 6 m / 12 m 1–12 m

Product Comparison Table

Comparison Item Q355B S355JR
Equivalent Standard GB/T 6728 EN 10219
Yield Strength Min (MPa) 355 355
Tensile Strength (MPa) 470-630 470-630
Typical Application Load-bearing structures, heavy supports, engineering frames High-load outdoor structures, heavy-duty construction projects
Corrosion Resistance After Galvanizing Good Good
Main Advantage High strength, good impact resistance, meets Chinese standard High strength for heavy-duty applications, EU project compliance

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FAQs

Our products follow GB/T 6728 for Q355B grade and EN 10219 for S355JR grade, suitable for Chinese and European overseas construction projects.

Q355B complies with Chinese GB/T 6728 standard; S355JR complies with European EN 10219 standard. Both grades have the same minimum yield strength for heavy load applications, with slight differences in chemical composition limits.

Yes, custom cutting service is available, subject to MOQ 5 tons.

Zinc coating weight ranges from 60g/m² to 275g/m², adjustable according to customer anti-corrosion requirements.

MOQ is 5 tons. Lead time is 7–15 working days after deposit received. Payment options include T/T and L/C at sight.

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