We supply hot dip galvanized square tubes (SHS) in Q235B/Q355B. Thick, uniform zinc coating ensures excellent anti-corrosion and long service life. High strength, full sizes, fast delivery. Ideal for construction, fencing, greenhouse frames and steel structures.
Hot dip galvanized square tube (SHS) is a square hollow section made of Q235B/Q355B steel, cold formed, high frequency welded and hot dip galvanized. The zinc layer provides both
barrier protection and
cathodic protection, preventing rust even if scratched. Service life reaches
20–50 years outdoors with little maintenance. Precise dimensions, straightness and strong welds ensure high load capacity, ideal for structural and outdoor projects.
Product Features:
● HDG Anti Corrosion: Zinc coating 80–200g/㎡ (65–120μm), uniform & adherent, excellent salt spray resistance
● Reliable Grade: Q235Bstandard, Q355B high strength option, yield ≥235MPa
● Strong Structure: Square section for high bending, compression & torsion resistance
● Full Sizes: Side 20–300mm, wall 1.5–12mm, standard 6m/12mlengths
● Nice Surface: Bright or matte finish, no skip galvanizing, ready to use without painting
● Custom Service: Cut to length, heavy zinc, punching, bevel, flange available
● Certified: GB/T 6728, ASTM A500, A123compliant
● Fast Delivery: 20,000 tonsin stock, 5–7 days for standard orders
Frequently Asked Questions (FAQ):
Q: Can you customize size and length?
A：Yes, we customize outer diameter, wall thickness, length and pipe shapes.
Q:What’s your payment term?
A:T/T (30% deposit, 70% balance before shipment) and L/C are acceptable.
Q:What standards do your products comply with?
A: GB/T 6728, ASTM A500, ASTM A123 and other international standards. Inspection reports can be provided.
| Item |
Specification |
| Product Name |
Hot Dip Galvanized Square Tube / Galvanized SHS |
| Material |
Q235B (Std), Q355B (High Strength) |
| Standard |
GB/T 6728, ASTM A500, ASTM A123 |
| Side Size |
20×20mm – 300×300mm |
| Wall Thickness |
1.5mm – 12mm |
| Standard Length |
6m / 12m (Custom lengths available) |
| Zinc Coating |
80–200g/㎡ (65–120μm) |
| Surface |
Bright / Spangle / Matte |
| End Finish |
Plain / Cut / Bevel / Flanged |
| MOQ |
100 ton / 1000 piece |
| Delivery Time |
5–15 days |
