Minjie Steel
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| Product name | hollow section square tube |
| Wall Thickness | 0.7mm--13mm |
| Length | 1--14m According to customer requirements ... |
| Outer Diameter | 20mm*20mm---400mm*400 |
| Tolerance | Tolerance based on Thickness: ±5～±8%; According to customer's request |
| Shape | square |
| Material | Q195---Q345, 10#, 45#, S235JR, GR.B-D, STK500, BS1387...... |
| Surface treatment | Galvanized |
| Zinc coating | Pre-galvanized square tube: 40--220G/M2; Hot dip galvanized square tube: 220--350G/M2 |
| Standard | ASTM, DIN, JIS, BS |
| Certificate | ISO, BV, CE, SGS |
| Payment terms | 30% T/T deposit in advance, 70% balance after B/L copy; |
| Delivery times | 25 days after receive ur deposits |
| Package |
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| Loading port | Tianjin/Xingang |
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Zinc coating
Diameter Detail
Australian customer purchase powder coating pre galvanized steel square tube. After customers receives the goods for the first time. Customer tests adhesive strength between the powder and the surface of the square tube. Customers test powder and square surface adhesion is small. We have meetings with customers to discuss this problem and we do tests all the time. we polished the surface of the square tube. Send the polished square tube to the heating furnace for heating. We tests all the time and discuss with customer all the time. We keep finding ways. After many tests, the final customer is very satisfied with the products. Now customer purchase a large number of products from factory every month.
The customer purchased steel pipes in our factory. After the goods were produced, the customer came to our factory for inspection.
We offer square tubes with outer diameters ranging from 20mm*20mm to 400mm*400mm, with wall thicknesses starting from 0.7mm up to 13mm. The lengths can be adjusted from 1m to 14m according to client specifications.
Our square tubes are manufactured using steel grades Q195 to Q345, 10#, 45#, S235JR, GR.B-D, and STK500. They strictly comply with global standards including ASTM, DIN, JIS, and BS.
We provide pre-galvanized square tubes with a coating thickness of 40-220G/M2, and hot-dip galvanized square tubes with a coating thickness of 220-350G/M2.
We hold certifications from ISO, BV, CE, and SGS. As a direct factory, we manage and inspect our production lines directly to guarantee both quality and prompt delivery.
Yes, we regularly collaborate with clients to resolve technical challenges. For instance, for our Australian customer, we optimized powder adhesion by refining the surface polishing and heat treatment processes, ensuring high-quality standards.
Our manufacturing facility is equipped with 4 pre-galvanized product lines, 8 ERW steel pipe product lines, and 3 hot-dipped galvanized process lines to support high-volume supply needs.
