ASTM A554 Grade 304 Welded Stainless Steel Mechanical Square Tube is a cold-formed, high-frequency welded (HFW) austenitic stainless steel tube designed for mechanical, architectural, and decorative applications. As the most widely specified grade under the ASTM A554 standard, it offers an excellent combination of corrosion resistance, mechanical strength, formability, and surface finish — all at a cost-effective price point.
Key Features:
1) Excellent corrosion resistance in atmospheric and mild chemical environments
2) Available in mill finish, brushed (#4), mirror polish (#8), or satin finishes to meet decorative and architectural requirements
3) Good weldability and fabrication performance, can be easily cut, drilled, bent, welded, and punched without cracking for most standard wall thicknesses
4) Cost-effective solution for structural and ornamental applications, offers superior value compared to 316L grade, ideal for projects where extreme corrosion resistance is not required
5) High strength-to-weight ratio, the square profile delivers excellent torsional rigidity and load-bearing capacity for framing and support applications
ASTM A554 Gr. 304 Chemical Composition & Mechanical Property:
Chemical Composition |
Chemical Composition, % | 304 | 304L | 316 | 316L |
C, max | 0.08 | 0.035 | 0.08 | 0.035 |
Mn, max | 2.00 | 2.00 | 2.00 | 2.00 |
P, max | 0.045 | 0.045 | 0.045 | 0.045 |
S, max | 0.030 | 0.030 | 0.030 | 0.030 |
Si, max | 1.00 | 1.00 | 1.00 | 1.00 |
Cr | 18.0-20.0 | 18.0-20.0 | 16.0-18.0 | 16.0-18.0 |
Ni | 8.0-11.0 | 8.0-13.0 | 10.0-14.0 | 10.0-15.0 |
Mo | / | / | 2.00-3.00 | 2.00-3.00 |
N | / | / | / | / |
Tensile Requirements | 304 | 304L | 316 | 316L |
Yield Strength (min)
MPa (psi) | 207 (30,000) | 172 (25,000) | 207 (30,000) | 172 (25,000) |
Tensile Strength (min)
MPa (psi) | 517 (75,000) | 483 (70,000) | 517 (75,000) | 483 (70,000) |
General information:
Standard: ASTM A554
Grade: 304
Size: OD: 10 x 10mm–200 x 200mm; WT: 0.5-8mm; L: 6m / Cut to length
Ends:
1) Plain ends
Available Finishing: mill finish; polished (180G, 320G, 400G, 600G); mirror finish; hairline / satin finish
Package: Bundled, waterproof material wrapped, polished or mirror surface tube protected with PVC film, wooden frames for safe transport or special requirements
Shipment: Land transportation by truck or train, sea transportation by container shipment or bulk vessel.
Hebei K-Steel Pipe Industry Our advantage:
Flexible Project Customization
We provide tailored manufacturing solutions to meet diverse project requirements, including customized outer diameter, wall thickness, and length specifications. In addition, we offer precision end preparation and a full range of anti-corrosion coating options to ensure optimal performance in various operating environments. This flexibility enables us to deliver line pipe solutions that align seamlessly with your technical and application needs.
Fast & Reliable Lead Time
With strong mill partnerships and readily available inventory resources, we are able to shorten production cycles and respond quickly to urgent project demands. Our integrated supply network ensures stable material availability, efficient scheduling, and on-time delivery — helping clients keep their projects on track without delay.
Advanced Technical & Quality Assurance
Equipped with our own metallurgical laboratories and supported by trusted third-party inspection agencies, we ensure every line pipe meets international standards and project specifications. Comprehensive testing and verification guarantee consistent mechanical properties, chemical composition, and coating integrity, providing clients with reliable, high-quality pipeline solutions.
Rapid Delivery & Complete Logistics
Leveraging fast supply capabilities and a well-established logistics network, we ensure timely delivery of line pipes to any project location. Our streamlined transportation and warehousing system minimize lead time, helping clients maintain smooth operations and meet critical project schedules.
