Description
Factory-direct stainless steel hollow sections — 13+ grades from 201 to 904L in cold-rolled BA finish, shipped with original mill test certificates and ready for SGS/BV inspection before loading.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | 304/304L/316/316L/321/201 Stainless Steel Square and Rectangular Hollow Section |
| Product Type | Square and Rectangular Stainless Steel Tube (Hollow Section) |
| Steel Grade | 201, 301, 301L, 304, 304L, 304N, 304H, 310S, 316, 316L, 317, 321, 410, 904L |
| Standard | ASTM A312 |
| Section Shape | Square / Rectangular |
| Size Range | 5mm–400mm (outer diameter) |
| Technique | Cold Rolled |
| Surface Treatment | BA (Bright Annealed) |
| Tolerance | ±5% |
| Welding Line Type | ERW |
| Processing Service | Welding |
| Invoicing | By Actual Weight |
| Delivery Time | 15–21 days |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Architectural & Construction | Building facade frames, interior structural columns, decorative handrails and balustrades |
| Gas Distribution | Indoor and outdoor gas piping systems requiring corrosion-resistant tubing |
| Food & Pharmaceutical | Hygienic processing lines, cleanroom support frames, food-grade fluid transfer |
| Machinery Fabrication | Equipment frames, conveyor structures, automated system supports |
Where Grade Traceability Decides Whether Your Shipment Clears Customs
Original mill test certificates with heat number traceability are non-negotiable for stainless steel hollow sections in regulated markets.
Buyers importing stainless steel square and rectangular hollow sections into the EU, Middle East, or Australia routinely face customs holds when chemical composition documentation does not match the declared grade. A 316L shipment missing molybdenum content records, or a 304 batch without proper ASTM A312 referencing, triggers inspection delays that cascade into project schedule overruns. [NEED_CITE: stainless steel grade traceability requirements for customs clearance]
The problem compounds when suppliers cannot provide third-party verification. Project specifications increasingly demand SGS or BV inspection reports alongside mill certificates — and suppliers who cannot produce these documents force buyers into costly re-certification or outright rejection at the port.
How Cold-Rolled BA Finish Meets Hygienic and Architectural Standards
Cold-rolled stainless steel square and rectangular hollow sections with BA (Bright Annealed) finish deliver the surface consistency required for both visible architectural applications and hygienic environments. The bright annealing process preserves a reflective, oxide-free surface that resists staining in food processing facilities and pharmaceutical cleanrooms — while providing the aesthetic uniformity that architects specify for exposed structural frames. For a stainless steel square and rectangular hollow section supplier serving both industrial and decorative markets, maintaining this finish quality across 13+ grades from 201 to 904L requires controlled atmosphere annealing and precise cold reduction.
Engineering Compliance Across Corrosive Environments and Structural Codes
Stainless steel hollow sections specified under ASTM A312 must demonstrate compliance with both material chemistry and dimensional tolerance requirements. The ±5% tolerance on cold-rolled ERW sections ensures fabrication precision for welded frame assemblies, while the full grade range — from economical 201 for interior dry environments to 904L for aggressive chemical exposure — allows engineers to match material selection to specific corrosion conditions. European projects may require CE marking under EN 10210/10219, while North American specifications reference ASTM standards directly; a qualified stainless steel square and rectangular hollow section supplier must document compliance with the applicable standard for each destination market. [NEED_CITE: ASTM A312 stainless steel pipe specification requirements]
Understanding Grade Selection and Cold-Rolled ERW Manufacturing
The 14 stainless steel grades offered span three distinct corrosion resistance tiers. The 200 series (201) provides cost-effective solutions for interior, low-corrosion applications. The 300 series (304, 304L, 316, 316L, 321, 310S, 317, 904L) covers the majority of architectural, food-grade, and marine environments — with 316L offering superior chloride resistance and 321 providing stabilization against sensitization during welding. The 400 series (410) serves martensitic applications requiring higher hardness. Cold-rolled ERW manufacturing produces tight dimensional tolerances and smooth surface finish compared to hot-formed alternatives, while the BA annealing process eliminates the need for subsequent pickling or polishing in most applications. Invoicing by actual weight rather than theoretical weight ensures buyers pay only for material received — a transparency point that matters on large-volume orders where tolerance stacking affects total cost.
The Hidden Cost of Unverified Stainless Steel Grades
Specifying 316L for a coastal facade and receiving 201 material creates more than a documentation problem — it creates a corrosion failure timeline. Stainless steel square and rectangular hollow sections installed in chloride-bearing environments without proper molybdenum content will show surface pitting within months, not years. [NEED_CITE: stainless steel grade misidentification consequences in construction] Beyond material substitution, missing mill certificates or incomplete heat number traceability can halt project acceptance, trigger re-inspection costs, and void warranty coverage. The expense of verifying grade compliance before shipment is always lower than the cost of replacing installed hollow sections.
Why Bulk Buyers Choose Our Stainless Steel Hollow Section Supply
Our production lines run three cold-rolled ERW trains simultaneously, producing stainless steel square and rectangular hollow sections in monthly volumes exceeding 20,000 tons across 2,800+ specifications. Every heat carries original mill test certificates documenting chemical composition and mechanical properties — and we welcome SGS or BV third-party inspection at our facility before container loading. Factory-direct pricing eliminates trading margins, with volume discount programs for partners committing to recurring procurement. Our export documentation team handles customs paperwork, container loading optimization, and multi-product consolidation for buyers sourcing both stainless and carbon steel sections from a single supply point.
Documentation & Compliance
- Mill test certificate documenting 304/316L chemical composition (Ni, Cr, Mo content) and mechanical properties per ASTM A312
- CE certificate covering EN 10210/EN 10219 compliance for European market hollow sections
- ISO 9001:2015 quality management certificate covering cold-rolled stainless steel tube production
- SGS or BV third-party inspection report available for pre-shipment grade verification and dimensional audit
- Full material traceability by heat number from slab to finished hollow section
- Export customs documents including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Cold-rolled BA finish stainless steel tubes bundled with steel strips and edge protectors to preserve surface quality during ocean transit
- Seaworthy packaging with waterproof wrapping for 316L and 304L sections destined for humid or coastal ports
- Container loading optimization for 5mm–400mm outer diameter sections, maximizing weight utilization within 20ft and 40ft containers
- Custom length cutting available to reduce on-site waste and support just-in-time fabrication schedules
- Heat number and grade identification marked on each bundle for site traceability and inspection verification
- FOB, CIF, and DDP shipping terms available with door-to-door logistics coordination
Start Your Stainless Steel Hollow Section Procurement
Submit your specification requirements — including grade, size, quantity, and destination port — to receive a competitive bulk quotation with mill test certificate confirmation and typical production lead times. Our technical team can advise on grade selection for your corrosion environment and provide non-standard size availability within the cold-rolled ERW range.
Request Your Stainless Steel Hollow Section Quotation
Send your specifications to admin@sdxinjiyuan.com or contact us via WhatsApp at +86 188 5315 7756 for bulk pricing and documentation confirmation.
