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Help CenterAISI 304 316 409 Stainless Steel Round Bar Square Flat Bar for Construction
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Wuxi Yansheng Technology Co., Ltd., a professional manufacturer established in 2017 with a factory size of 1,000–3,000 square meters and an annual export value exceeding US$50 million, proudly presents our premium AISI 304, 316, and 409 Stainless Steel Round Bar, Square Bar, and Flat Bar – specifically engineered for demanding construction projects. Our bars combine exceptional corrosion resistance, high tensile strength, and precise dimensional tolerances, ensuring reliable performance in structural frameworks, reinforcement, and architectural applications. With over 100 skilled employees and a robust supply chain, we deliver consistent quality across global markets including North America, Europe, and Southeast Asia.
Our stainless steel bars are available in three popular grades: 304 (general-purpose, excellent corrosion resistance), 316 (superior resistance to chlorides and acids, ideal for marine environments), and 409 (cost-effective for high-temperature applications like exhaust systems). Each bar is manufactured to strict ASTM A276 and JIS G4303 standards, with customizable lengths and surface finishes to meet your project specifications. The round bars range from 6mm to 300mm in diameter, while square and flat bars offer widths from 10mm to 200mm, all available in 1m to 6m lengths.
Key Features & Technical Specifications
Material Grade Options: AISI 304 (good formability), AISI 316 (enhanced corrosion resistance), AISI 409 (heat-resistant ferritic).
Shapes: Round bar (solid cylindrical), square bar (equal sides), flat bar (rectangular cross-section).
Dimensional Tolerances: Meet ASTM A276 and EN 10088 standards; thickness tolerance ±0.1mm for precision.
Surface Finishes: Bright (cold drawn), pickled (matte), black (hot rolled), or polished (mirror) – optional based on order.
Mechanical Properties: Tensile strength up to 620 MPa (316 grade), yield strength ≥ 205 MPa, elongation ≥ 40%.
Corrosion Resistance: Excellent resistance to rust, pitting, and stress corrosion cracking in construction environments.
Weldability & Machinability: Excellent for welding, cutting, bending, and drilling – suitable for on-site fabrication.
| Parameter | Round Bar | Square Bar | Flat Bar |
|---|---|---|---|
| Grade | 304, 316, 409 | 304, 316, 409 | 304, 316, 409 |
| Diameter / Width | 6mm – 300mm | 10mm – 200mm | 10mm – 200mm (width) |
| Length | 1m – 6m (custom) | 1m – 6m (custom) | 1m – 6m (custom) |
| Surface Finish | Bright, Pickled, Black, Polished | Bright, Pickled, Black, Polished | Bright, Pickled, Black, Polished |
| Typical Applications | Structural columns, shafts, handrails | Frames, brackets, gates | Beams, supports, cladding |
Our bars undergo rigorous quality control: each batch is tested for chemical composition, mechanical properties, and dimensional accuracy. We offer customizable cutting to your exact lengths, reducing waste and fabrication time on site. The bars are packed securely with anti-rust paper and wooden crates for safe ocean freight to Tianjin, Shanghai, Qingdao, or Ningbo ports.
Why choose Wuxi Yansheng Technology? We are a manufacturer with direct factory control, enabling competitive pricing and fast lead times (typically 15–25 days). Our products are certified under ISO9001, ISO14000, OHSAS18001, and other international standards, reflecting our commitment to quality, environmental responsibility, and occupational health. With an annual export value of US$50–100 million, we have served clients across 20+ countries, including demanding markets in North America, Europe, and the Middle East.
We invite you to contact us for a quote or sample – our team provides technical support to help you select the right grade and size for your construction project. Whether you need AISI 304 for general building, 316 for coastal infrastructure, or 409 for high-temperature flues, Wuxi Yansheng Technology delivers quality you can trust.
Frequently Asked Questions
What is the difference between AISI 304, 316, and 409 stainless steel bars for construction? 304 is the most common grade with good corrosion resistance; 316 offers superior resistance to chlorides and acids (ideal for marine or chemical environments); 409 is a ferritic grade with good heat resistance but lower corrosion resistance, suitable for exhaust systems or high-temperature applications. Our team can advise based on your specific exposure conditions.
Can you custom cut the bars to specific lengths? Yes, we offer custom cutting to lengths as short as 0.5m or as long as 6m, with tolerances of ±1mm. Please specify the exact dimensions when ordering.
What surface finishes are available? We provide bright (cold drawn, smooth), pickled (matte, oxide-free), black (hot rolled with scale), and polished (mirror finish). Each finish serves different aesthetic or functional needs – bright is common for machined parts, polished for architectural elements.
Do you provide test certificates or material reports? Absolutely. Each shipment includes a mill test certificate (MTC) with chemical composition and mechanical properties. Third-party inspection (e.g., SGS, BV) is available upon request at additional cost.
What is the minimum order quantity (MOQ)? For standard sizes, MOQ is 500 kg per grade and shape. For non-standard or custom sizes, MOQ may be 1,000 kg. We can discuss smaller quantities for sample orders.
How are the bars packaged for export? Bars are bundled with steel straps, wrapped in anti-rust paper and plastic film, then packed in wooden crates or pallets suitable for sea freight. Each bundle is marked with grade, size, and heat number for traceability.
Which ports do you ship from? We mainly ship from Tianjin, Shanghai, Qingdao, and Ningbo ports. Delivery time to most international ports is 15–30 days depending on destination.
Can you provide samples before bulk order? Yes, we can supply small samples (up to 30 cm length) for quality evaluation. The sample is free, but shipping cost is borne by the buyer. Please contact our sales team to arrange.
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