Q355B & S235JR Galvanized Square Rectangular Steel Pipe | GB/T 6728 EN 10219 Hollow Section

Q355B & S235JR Galvanized Square Rectangular Steel Pipe | GB/T 6728 EN 10219 Hollow Section

  1. Hot-dip galvanized coating provides outstanding anti-corrosion performance for outdoor use
  2. Compliant with GB/T 6728 and EN 10219 standards for global project acceptance
  3. High mechanical strength, suitable for load-bearing structural engineering
  4. Smooth surface, uniform zinc layer, easy cutting, welding and fabrication
  5. Stable dimension tolerance, ideal for building frames and solar support systems
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Product Overview

Our Q355B & S235JR galvanized square and rectangular steel pipe is a hot-dip galvanized hollow section produced in accordance with GB/T 6728 and EN 10219 standards. The base metal adopts Q355B and S235JR carbon steel grades, then processed with hot-dip galvanization to form a dense zinc protective layer on the steel surface.

This galvanized square rectangular pipe balances mechanical strength and corrosion resistance. Q355B grade delivers higher yield and tensile strength for heavy load projects, while S235JR features excellent weldability for general construction. Widely used in building frameworks, greenhouse structures, solar mounting brackets, guardrails, engineering supports and infrastructure projects. The product maintains stable geometric tolerances, uniform zinc coating thickness, and long service life in outdoor and humid environments. We support custom lengths and cutting services to meet different engineering requirements.

Galvanized Square/Rectangular Steel Pipe

Chemical & Mechanical Property Snapshot

Property Item Q355B S235JR
Standard GB/T 6728 EN 10219
Yield Strength Min (MPa) 355 235
Tensile Strength (MPa) 470-630 360-510
C ≤ (%) ≤0.20 ≤0.17
Mn ≤ (%) ≤1.60 ≤1.40
Si ≤ (%) ≤0.50 ≤0.35
P ≤ (%) ≤0.035 ≤0.035
S ≤ (%) ≤0.035 ≤0.035
Elongation A (%) ≥21 ≥25

Detailed Technical Specifications

Specification Item Details
Product Name Galvanized Square / Rectangular Steel Pipe
Steel Grade Q355B, S235JR
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 S235JR
Equivalent Standard GB/T 6728 EN 10219
Yield Strength Min (MPa) 355 235
Tensile Strength (MPa) 470-630 360-510
Typical Application Load-bearing structures, heavy supports, engineering frames European-standard general construction, greenhouses, light frames
Corrosion Resistance After Galvanizing Good Good
Main Advantage High strength, good impact resistance EU project compliance, excellent weldability, cost-effective

App Market

Reliable Steel Coil Solutions For Diverse Industrial Applications

New Energy Photovoltaic Industry

Building Enclosure and Security Engineering

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FAQs

Our galvanized hollow sections follow GB/T 6728 for Q355B grade and EN 10219 for S235JR grade, meeting requirements for overseas construction projects.

Q355B has higher yield strength for heavy load structural applications. S235JR has great weldability, more suitable for light and medium load European construction projects. Both have good anti-corrosion performance after hot dip galvanizing.

Yes. We can cut the galvanized square and rectangular pipe to your required custom lengths, based on MOQ 5 tons.

The zinc coating weight ranges from 60g/m² to 275g/m². We can adjust zinc thickness according to customer requirements.

MOQ is 5 tons. Lead time is 7–15 working days after receiving deposit. Payment can be T/T or L/C at sight.

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