Galvanized Square Tube, also known as Galvanized Square Hollow Section (SHS), is a carbon steel tube coated with a protective layer of zinc through the hot-dip galvanizing or pre-galvanizing process. It provides outstanding corrosion resistance, long-lasting durability, and excellent structural performance in outdoor and industrial environments.
Manufactured in accordance with ASTM A500, JIS G3466, EN10219, and GB/T6728 standards, galvanized square tubes are widely used in construction, steel structures, machinery, furniture, and solar mounting systems.
Our factory offers a full range of square and rectangular galvanized steel tubes with customized sizes, thicknesses, and coating weights to meet global customer requirements.
Main Keywords: Galvanized Square Tube, Hot Dip Galvanized Square Pipe, Galvanized Square Hollow Section, Pre-Galvanized Steel Tube, SHS Steel Tube Manufacturer, Square Hollow Steel Section Supplier
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Chemical Composition (Typical %)
| Grade | C (max) | Mn (max) | P (max) | S (max) |
|---|---|---|---|---|
| Q195 | 0.12 | 0.50 | 0.04 | 0.04 |
| Q235 | 0.22 | 1.40 | 0.05 | 0.05 |
| Q345 | 0.20 | 1.60 | 0.035 | 0.035 |
| STKR400 | 0.25 | 1.60 | 0.040 | 0.040 |
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|
| Q195 | ≥ 195 | ≥ 315 | ≥ 33 |
| Q235 | ≥ 235 | ≥ 375 | ≥ 26 |
| Q345 | ≥ 345 | ≥ 470 | ≥ 21 |
| STKR400 | ≥ 245 | ≥ 400 | ≥ 23 |
International Standard Size Chart
| Size (mm) | Wall Thickness (mm) | Weight (kg/m) | Length (m) |
|---|---|---|---|
| 20×20 | 1.0–3.0 | 0.62–1.78 | 6 / 12 |
| 25×25 | 1.2–4.0 | 0.91–2.84 | 6 / 12 |
| 30×30 | 1.2–4.0 | 1.12–3.45 | 6 / 12 |
| 40×40 | 1.5–5.0 | 1.73–5.29 | 6 / 12 |
| 50×50 | 1.5–6.0 | 2.22–7.43 | 6 / 12 |
| 60×60 | 1.5–6.0 | 2.67–8.93 | 6 / 12 |
| 80×80 | 2.0–8.0 | 4.77–13.50 | 6 / 12 |
| 100×100 | 2.0–10.0 | 5.96–16.68 | 6 / 12 |
| 150×150 | 3.0–12.0 | 13.31–32.51 | 6 / 12 |
| 200×200 | 4.0–16.0 | 21.16–61.33 | 6 / 12 |
| Standard | ASTM A500 / JIS G3466 / EN10219 / GB/T6728 |
|---|---|
| Material Grades | Q195, Q235, Q345, S235JR, STKR400, STKR490 |
| Shape | Square / Rectangular |
| Outer Size | 15×15 mm – 500×500 mm (Square) / 20×30 mm – 400×600 mm (Rectangular) |
| Wall Thickness | 0.8 mm – 25 mm |
| Length | 6 m, 12 m, or customized |
| Zinc Coating | 40–600 g/m² |
| Surface Finish | Hot Dip Galvanized / Pre-Galvanized / Electro-Galvanized |
| End Type | Plain, Beveled, or Capped |
| Tolerance | As per ASTM / JIS / EN standards |
| Packing | In bundles with steel strips and waterproof wrapping |
Galvanized square tube Metal Content
| Grade | C | Mn | Si | P | S |
| Q215A | 0.15 | 1.2 | 0.35 | 0.035 | 0.035 |
| Q215B | 0.15 | 1.2 | 0.35 | 0.035 | 0.035 |
| Q235B | 0.22 | 1.4 | 0.35 | 0.035 | 0.035 |
| Q195 | 0.12 | 0.5 | 0.3 | 0.035 | 0.035 |
| Q275 | 0.28-0.38 | 0.50-0.80 | 0.35 | 0.045 | 0.05 |
* Process: Pre-galvanized steel pipes are galvanized before they are formed into the final product. The galvanization process
typically involves coating the steel with a layer of zinc through either a hot-dip process or an electroplating process.
* Appearance: Pre-galvanized pipes have a smoother and more even zinc coating. The surface is usually shinier and has a uniform appearance.
* Application: Pre-galvanized pipes are often used in applications where the final appearance is important, such as in outdoor structures, fencing, and decorative applications.
HOT-DIP GALVANIZED STEEL SQUARE/RECTANGLE TUBE
* Process: Hot-dip galvanized steel pipes are formed first and then immersed in a molten bath of zinc. The immersion process results in a thicker and more durable zinc coating compared to pre-galvanized pipes.
* Appearance: Hot-dip galvanized pipes may have a rougher surface compared to pre-galvanized pipes due to the thicker zinc coating. The coating is usually more uneven, but it provides greater protection against corrosion.
* Application: Hot-dip galvanized pipes are commonly used in applications where corrosion resistance is a critical factor, such as in water pipelines, construction, and outdoor structures exposed to harsh environment
Looking for a reliable Galvanized Square Tube manufacturer and exporter in China?
We provide high-quality galvanized square and rectangular steel tubes at competitive factory prices with full export support.
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
office@dongmjd.com
FAQ (Frequently Asked Questions)
Q1: What is the difference between hot-dip galvanized and pre-galvanized square tubes?
A1: Hot-dip galvanizing immerses the tube in molten zinc for thick, durable coating (40–600 g/m²), while pre-galvanized tubes have thinner coatings applied before forming.
Q2: What standards do you follow for galvanized square tubes?
A2: Our tubes comply with ASTM A500, JIS G3466, EN10219, and GB/T6728 international standards.
Q3: What is the typical zinc coating thickness?
A3: The zinc coating thickness ranges from 40 to 600 g/m², depending on application and customer requirements.
Q4: Can galvanized square tubes be welded or painted?
A4: Yes, they can be welded, drilled, or painted easily without damaging structural integrity.
Q5: What is the standard length for export?
A5: Standard lengths are 6 meters and 12 meters, with custom cutting available per order.
Q6: What are your main material grades?
A6: Common grades include Q195, Q235, Q345, STKR400, and S235JR, ensuring versatile mechanical performance.
Q7: How do you ensure coating quality?
A7: We perform zinc layer thickness inspection, adhesion tests, and salt spray tests to verify corrosion resistance.
Q8: What is your minimum order quantity (MOQ)?
A8: The MOQ is usually 5–10 tons per size, but small trial orders are acceptable for first cooperation.
Q9: What kind of packaging do you offer?
A9: Bundles with steel strips, plastic caps, and waterproof wrapping for safe sea shipment. Wooden pallets are optional.
Q10: Do you provide certificates and third-party inspection?
A10: Yes. Mill Test Certificate (EN10204/3.1) is provided, and SGS, BV, or TUV inspections are available upon request.
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