Stainless Steel Square Tube: Sizes, Price & Supplier Guide

Stainless steel square tube: A Practical Buying Guide

Looking for a reliable stainless steel square tube supplier? Huaxiao Stainless keeps 100,000 tons of inventory, ships in 15 days, and is certified to ISO/TS16949. Before you request a quote, here is what actually matters when specifying and sourcing stainless steel square tube.

Why Choose Stainless Steel Square Tube

Stainless steel square tube gives you a closed, four-square profile that resists torsion and bending better than open sections of the same weight – ideal for frames, guards, handrails and structural members where stiffness in all directions matters. Produced by roll-forming strip and welding the seam, square tube is far cheaper than seamless for the same outside dimension, and the weld is fully consolidated and tested for structural and decorative use.

Choose 304 for indoor and architectural frames, 316L for coastal or chloride-exposed structures, and specify a brushed or mirror finish when the tube is visible. Square tube is the backbone of modular stainless framing because corners, connectors and end caps are standard off the shelf.

Specifications, Sizes & Surface Finish

We stock square tube to ASTM A554 (mechanical) and A312 / A269 (instrumentation). Outside dimension runs 10×10 mm to 100×100 mm, wall 0.8 mm to 4 mm, length 6 m standard or cut to order. Finish: mill (ASTM A554), 180/240/320/400 grit brushed, or mirror.

• Grade: 304 / 304L standard, 316L for marine
• Weld: longitudinal seam, pickled or bright-annealed; TIG option for visible tube
• Finish: mill, brushed (No.4 / hairline), or 8K mirror
• Tolerance: per A554 for mechanical tube; OD and wall on request

Typical 304 properties: tensile 515 MPa min, yield 205 MPa min, elongation 40% min.

Stainless Steel Square Tube Price Factors

The stainless steel square tube price per kg is set by grade (316L costs more for molybdenum), wall thickness (thicker wall = more weight = more cost), and finish (mirror and brushed add polishing). Welded square tube is far more economical than seamless round tube of equal size, which is why it dominates framing.

• Grade: 304 for architecture, 316L for marine
• Wall: heavier wall raises the per-meter price sharply
• Finish: mirror adds the most; mill finish is cheapest

Give us the OD, wall and length and we quote per meter or per kg as you prefer, with cut-to-length priced per cut.

Common Applications

Square tube frames everything: handrails and balustrades, machine guards and enclosures, equipment and racking frames, architectural trims and supports, display and shopfitting structures, marine rails, and the visible skeleton of stainless furniture. Its closed section and square corners make it the default for bolt-together framing systems.

How to Choose a Reliable Supplier

For square tube check the weld line (must be continuous and flush), corner radius and straightness, and the surface finish on visible runs, plus the mill cert for the grade. A credible stainless steel square tube supplier supplies cut-to-length, end caps and connectors and stands behind the weld quality.

Huaxiao Stainless carries 100,000 tons in stock, ships in 15 days, and works to ISO/TS16949, which matters when the tube feeds a structural or architectural line.

Frequently Asked Questions About Stainless steel square tube

Get a Quote for Stainless steel square tube

Stainless steel square tube in stock: 100,000 tons available, 15-day delivery, certified to ISO/TS16949. Browse our stainless steel square tube product page or contact us for a quote to get a competitive price today.