Q345 Galvanized Steel Pipe
Q345 Galvanized Steel Pipe
Q345 Galvanized Steel Pipe
Q345 Galvanized Steel Pipe
Q345 Galvanized Steel Pipe
Q345 Galvanized Steel Pipe
q345-gi-pipe (3)
Q345 Galvanized Steel Pipe
Q345 Galvanized Steel Pipe
Q345 Galvanized Steel Pipe
Q345 Galvanized Steel Pipe
Q345 Galvanized Steel Pipe

Q345 Galvanized Steel Pipe/Tube

Q345 Galvanized Steel Pipe is a low-alloy high-strength structural steel (Chinese standard GB/T 1591) coated with zinc through hot-dip galvanization. The “Q345” denotes a minimum yield strength of 345 MPa (equivalent to ASTM A572 Grade 50 or EN S355). The zinc coating provides exceptional corrosion resistance, making it ideal for harsh environments.

    • Steel grade: Q345 (equivalent to ASTM A572 Gr.50).
    • Zinc coating: typically 40–600g/m².
    • Outer diameter range: Round: 21.3mm – 219.1mm (or larger, up to 406.4mm)
      Square: 20x20mm – 400x400mm
      Rectangular: 20x40mm – 300x500mm (or larger, up to 400x800mm).
    • Wall thickness: 0.8–20mm (customizable).
    • Standards: GB/T 3091, ASTM A53, BS 1387, EN 10255, EN 10219, JIS G3444, etc..
    • Shapes: Round, square, or rectangular sections.
    • Certificated：ISO9001:2015, CE, ROHS

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Description

What is the Q345 Galvanized Steel Pipes?

Q345 Galvanized Pipe is a type of steel pipe that combines the high – strength properties of Q345 steel with the corrosion – resistant benefits of galvanization. Q345 steel, also known as low – alloy high – strength structural steel, has a yield strength of no less than 345MPa. This steel grade contains alloying elements such as manganese, silicon, and vanadium, which endow it with excellent mechanical properties, including high tensile strength, good plasticity, and impact resistance.
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The galvanization process involves coating the surface of the Q345 steel pipe with a layer of zinc, usually through hot – dip galvanizing pipe or electro – galvanizing. Hot – dip galvanizing is the more common method, where the steel pipe is immersed in a molten zinc bath. This results in a relatively thick and durable zinc coating that adheres well to the steel surface, providing long – term protection against corrosion. The zinc coating not only acts as a physical barrier between the steel and the external environment but also provides sacrificial protection. When the zinc coating is scratched or damaged, the zinc will corrode preferentially, sacrificing itself to protect the underlying steel.

Technical Parameters of Q345 GI Pipe

Parameter Details
Steel Grade Q345 (equivalent to ASTM A572 Gr.50)
Outer Diameter 20 mm – 800 mm (customizable)
Wall Thickness 1.5 mm – 30 mm (customizable)
Length 5.8 m / 6 m / 12 m or customized
Zinc Coating Thickness 40–600 g/m² (depending on galvanizing process)
Surface Treatment Hot-dip galvanized / pre-galvanized
Standard GB/T 3091, GB/T 6728, EN 10219, ASTM A53
Tolerance As per relevant industry standards
Pipe Ends Plain ends, beveled ends, or threaded
Chemical Composition of Q345 Steel (Typical Values)
Element Content (%)
Carbon (C) ≤0.20
Manganese (Mn) 1.00 – 1.60
Silicon (Si) ≤0.55
Sulfur (S) ≤0.045
Phosphorus (P) ≤0.045
Vanadium (V) 0.02 – 0.15
Niobium (Nb) 0.015 – 0.060
Titanium (Ti) 0.02 – 0.20

Mechanical Properties of Q345 Galvanized Steel Pipe

Property Index
Yield Strength (MPa) ≥345
Tensile Strength (MPa) 470 – 630
Elongation (%) ≥21
Impact Energy (at 20℃, KV2, J) ≥34

Advantages of Q345 Galvanized Pipe

✅ High Strength – Q345 steel delivers outstanding yield and tensile strength for heavy-load and structural applications.
✅ Superior Corrosion Resistance – The galvanized zinc coating offers robust protection against atmospheric corrosion, extending the pipe’s service life.
✅ Excellent Weldability – Q345 steel can be easily welded, cut, and machined, ensuring flexibility during fabrication and installation.
✅ Smooth Surface Finish – Provides a neat, uniform appearance and facilitates additional painting or coating if needed.
✅ Reduced Maintenance Costs – Less prone to rust and deterioration, lowering long-term maintenance expenses.
✅ Cost-Effective – Combines strength and corrosion resistance at an affordable price, making it an economical choice for large-scale projects.

Applications of Q345 Galvanized Steel Tube

Q345 galvanized steel pipes are widely used in industries requiring reliable strength and corrosion protection, including:

✔ Structural engineering: beams, columns, trusses, frameworks
✔ Construction: bridges, high-rise buildings, scaffolding systems
✔ Machinery manufacturing: equipment supports, mechanical components
✔ Transportation: automotive parts, trailers, truck frames
✔ Agriculture: greenhouse frames, irrigation systems, fencing
✔ Power industry: transmission towers, substations
✔ Marine structures: piers, docks, coastal defense
✔ Oil & gas: pipeline supports, cable protection
✔ General industrial uses requiring robust, rust-resistant piping

galvanized pipe application

How to Choose the Right Galvanized Pipe/Tubes

When selecting galvanized pipes for your project:

  • 🔍 For light structural and low-pressure needs → Choose Q195

  • 🏗️ For general construction use → Choose Q235

  • 🏢 For heavy-duty, high-strength applications → Choose Q345

Comparison Table: Q345 vs Other Galvanized Steel Pipes

Feature Q195 Galvanized Pipe Q215 Galvanized Pipe Q235 Galvanized Pipe Q345 Galvanized Pipe
Tensile Strength 315–430 MPa 315–430 MPa 375–500 MPa 470–630 MPa
Yield Strength ≥195 MPa ≥215 MPa ≥235 MPa ≥345 MPa
Plasticity High Medium-High Medium Lower
Strength Low Medium Medium-High High
Weldability Excellent Excellent Good Moderate
Cost Lowest Low Moderate Higher
Application Suitability Light structures Medium-load structures Structural, pressure pipe Heavy-load structures

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