Wholesale Dealers of S355jr Galvanized Square Pipe - 20×20 40×40 1×1 inch Galvanized Square Tube For Steel Structure – Baowusteel company Detail:
Pre-galvanized square tube base material is galvanized steel straps then ERW welded to steel tubes. The most produced surface zinc coating thickness of pre-galvanized square tube is 30-40g/㎡ in China market .
Hot-dipped galvanized square tube base material is black tube (no surface finish),then going through zinc pool to get the finished product. The zinc coating thickness 200-600g/㎡.
Baowusteel company International Trading Co., Ltd has powerful system of storage, production and distribution based in the steel industrial area of China. The company is able to supply full sizes of tube and customized specification service, achieve one-stop service and save time and effort for customers.
| OD | 10mmx10mm-500mmx500mm |
| Thickness | 0.6mm-3mm for pre-galvanized square tube;2.5-15mm for hot-dipped galvanized square tube; (1-26 Gauge, 0.023inch-0.59inch) |
| Length | 1-11.8m (5.8m, 6m, 6.1m, 6.4m, 7.3m available customized)3ft-39ft (19ft, 19.6ft, 20ft, 21ft, 24ft) |
| Zinc coating | Pre galvanized:40- 120g/m² Hot dipped galvanized:200-600g/m² |
| Raw material | Q195, Q235, Q345 |
| Standard | EN10219,ASTM A500,GB/T6728 |
Galvanized Square Tube Size Chart
| SQUARE TUBE SQUARE HOLLOW SECTION ![]() |
RECTANGULAR TUBE RECTANGULAR HOLLOW SECTION (RHS) ![]() |
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| OD (inch) | OD(mm) | OD(inch) | OD(mm) | OD(inch) | OD(mm) | OD(inch) | OD(mm) |
| 1” x 1” | 25 x 25 | 3 1/2” x 31/2” | 90 x 90 | 3/4” x 1 1/2” | 20 x 40 | 2 1/2” x 4” | 60 x 100 |
| 1 1/4” x 1 1/4” | 30 x 30 | 4” x 4” | 100 x 100 | 1” x 2” | 25 x 50 | 3” x 4” | 80 x 100 |
| 1 1/2” x 1 1/2” | 40 x 40 | 4 5/8” x 4 5/8” | 120 x 120 | 1 1/4” x 2” | 30 x 30 | 4” x 6” | 100 x 150 |
| 2” x 2” | 50 x 50 | 5” x 5” | 125x 125 | 1 1/2” x2 1/2” | 40 x 60 | 4” x 8” | 100 x 200 |
| 2 3/8” x 2 3/8” | 60 x 60 | 6” x 6” | 150 x 150 | 1 1/2” x 3” | 40 x 80 | 6” x 8” | 150 x 200 |
| 2 1/2” x 2 1/2” | 60 x 60 | 8” x 8” | 200 x 200 | 2 1/2” x 3” | 60 x 80 | 8” x 10” | 200 x 250 |
| 3” x 3” | 80 x 80 | more | more | 2” x4” | 50 x 100 | more | |
Usage & Application
Furniture pipe,Structure pipe,Fence post, Greenhouse Frame, Construction, Building material, Steel structure.

Package
1.In bundle only, no other package.
2.In bundle tied with steel straps, plastic cover package, each end of bundle with nylon straps.
Shipping
FAQ:
Q: What’s the surface coating thickness?
A: The common zinc coating thickness is 40g/㎡。
Q: What’s the steel grade of your galvanized square tube?
A: The common steel grade is Q195 (yield strength 195mpa). The base material is non-alloy low carbon steel.
Q: Can you produce special size?
A: We accept customized size. Please do not hesitate contact us to verify the size.
Q:Do you have stock?
A: Yes, we have stock for common size. Please send us the size you were looking for, we will check for you.
Q: About sample.
A: The sample is free of charge for weight less than 1kg.
Note: We send sample by air courier for weight less then 1kg. The courier cost is in charge. We will return the courier fee to customers once we cooperated.
Product detail pictures:




Related Product Guide:
Our products are broadly regarded and reliable by end users and can meet up with constantly transforming financial and social requires of Wholesale Dealers of S355jr Galvanized Square Pipe - 20×20 40×40 1×1 inch Galvanized Square Tube For Steel Structure – Baowusteel company, The product will supply to all over the world, such as: Cambodia, Peru, Boston, Corporate goal: Customers' satisfaction is our goal, and sincerely hope to establish long-terms stable cooperative relations with customers to jointly develop the market. Building brilliant tomorrow together!Our company regards "reasonable prices, efficient production time and good after-sales service" as our tenet. We hope to cooperate with more customers for mutual development and benefits. We welcome potential buyers to contact us.
This supplier offers high quality but low price products, it is really a nice manufacturer and business partner.
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