Square & Rectangular Tubes
Square & Rectangular Tubes Manufacturer and Supplier in Indonesia
Square and rectangular steel tubes, also called hollow structural sections (SHS/RHS), are cold-formed welded profiles with high strength-to-weight ratio for structural and architectural applications. Sino East Steel is a square & rectangular tubes manufacturer and supplier based in Tianjin, China, exporting to Indonesia and more than 50 countries for over 18 years. As a direct factory supplier with a 65,000 m2 production base and 500,000 tons of annual capacity, we deliver to Indonesian importers, distributors, contractors and project companies with complete documentation, including the Mill Test Certificate (MTC) per EN 10204 3.1 on every shipment.
Indonesian buyers choose our square & rectangular tubes because every batch is tested in our ISO 9001:2015 certified quality system, packed seaworthy and shipped to Tanjung Priok (Jakarta), Tanjung Perak (Surabaya), Belawan (Medan) and Makassar within 18-25 days after production. Third-party inspection by SGS, BV or TUV can be arranged at the factory or at the destination port, and SNI documentation support is available for regulated applications.
What Is Square & Rectangular Tubes?
Square and rectangular hollow sections are produced by cold forming steel strip into a closed shape and welding the seam with high-frequency ERW, then sizing to exact dimensions. Their closed section geometry gives excellent torsional and bending stiffness, making them ideal for columns, beams, trusses, frames, gates, railings and furniture frames, and they are lighter than solid sections of equivalent strength.
Indonesian fabricators, steel traders and contractors buy square and rectangular tubes from Sino East Steel in sizes from 20x20 mm to 200x200 mm and wall thicknesses from 1.0 mm to 12 mm, black or galvanized, with full MTC documentation.
Standards, Grades and Specification Range
Our square & rectangular tubes is manufactured to internationally recognized standards and supplied in the sizes most frequently ordered by Indonesian importers and distributors:
| Item | Specification |
|---|---|
| Standards | ASTM A500, EN 10219, JIS G3466, GB/T 6728 |
| Grades | Q195, Q235, Q345, ASTM A500 Gr. B/C |
| Sizes | 20x20 mm to 200x200 mm (SHS), 30x15 to 300x150 mm (RHS) |
| Wall thickness | 1.0 mm - 12.0 mm |
| Length | 6 m / 12 m, or cut to order |
| Finish | Black, or hot-dip galvanized |
| Corners | Sharp, or rounded corner profiles |
| Certification | ISO 9001:2015, MTC per EN 10204 3.1 |
Seam Integrity and Dimensional Precision
The welded seam is the critical zone of a hollow section. Our ERW mills control welding temperature and seam quality with online ultrasonic testing, and every tube is straightened and sized to tight corner and flatness tolerances so that frames and structures assemble without rework. Galvanized hollow sections are coated after welding, protecting both the outside surface and the internal bore.
Applications of Square & Rectangular Tubes in Indonesia
- Structural frames - Portal frames, columns and trusses for industrial buildings.
- Fabrication - Gates, railings, balustrades and staircases.
- Furniture - Table and chair frames, shelving and display systems.
- Agricultural - Greenhouse frames and livestock equipment.
- Automotive - Trailers, racks and vehicle accessories.
Why Indonesian Buyers Buy Direct from Our Factory
When you source square & rectangular tubes from Sino East Steel, you buy from the manufacturer, not a trading company. That means the specification confirmed in the quotation is the specification delivered, at mill-direct pricing with complete quality accountability:
| Factor | Factory direct (Sino East Steel) | Trading company |
|---|---|---|
| Pricing | Mill-direct, no middleman markup | Multiple markups added |
| Quality control | In-house testing lab, heat number traceability | Relies on supplier documents |
| Documentation | MTC per EN 10204 3.1 on every batch | Documents often incomplete |
| Production control | Direct scheduling, 15-25 days lead time | Lead time dependent on third parties |
| Custom orders | Custom dimensions and specifications accepted | Limited to stocked items |
How to Order Square & Rectangular Tubes as an Indonesian Importer
- Send your required standard, grade, size, quantity and destination port to [email protected] or WhatsApp +86 186 2208 8833.
- Receive a formal quotation with FOB Tianjin or CIF pricing, delivery time and shipping options within 24 hours.
- Confirm the specification in writing; production starts after order confirmation and 30% deposit.
- Track your shipment with weekly progress updates and full export documentation, including MTC, commercial invoice, packing list and bill of lading.
Shipping and Logistics to Indonesian Ports
We ship on a monthly rolling schedule to the main Indonesian ports: Tanjung Priok (Jakarta), Tanjung Perak (Surabaya), Belawan (Medan) and Makassar, with regular consolidation for mixed-product container orders. Sea freight from Tianjin to Indonesian ports typically takes 18-25 days. Mixed sizes and mixed product lines can be consolidated in one container to reduce your total landed cost.
Frequently Asked Questions
What is the minimum order quantity?
MOQ is typically 5 metric tons per specification, and mixed-size container loads of 20 or 40 feet are welcomed for distributors and project stock orders.
What are the payment terms?
We accept T/T, L/C, D/A, D/P and O/A for long-term partners. Standard terms are 30% deposit and 70% against copy of shipping documents.
Do you provide Mill Test Certificates?
Yes, every batch ships with an MTC per EN 10204 3.1 including chemical composition and mechanical test results.
How long does delivery to Indonesia take?
Production takes 15-25 days after specification confirmation, followed by 18-25 days sea freight to Tanjung Priok, Tanjung Perak, Belawan or Makassar.
Can third-party inspection be arranged?
Yes, SGS, BV or TUV inspection can be arranged at the factory before loading or at the destination port, which is common for government and project supply in Indonesia.
What is the difference between SHS and RHS?
SHS (square hollow section) has equal sides; RHS (rectangular) has different width and height, chosen for directional strength and aesthetics.
Can you supply galvanized square tubes?
Yes, we supply hot-dip galvanized hollow sections for outdoor and coastal applications.
Request a Quote from the Square & Rectangular Tubes Manufacturer
Send your specification to [email protected] or message us on WhatsApp +86 186 2208 8833. We respond within 24 hours with pricing, lead time and shipping options to Indonesian ports.