Stainless Steel Square Pipe & Tube
We supply ss square tube and stainless steel square pipe, cut and finished in our own plant in Wuxi and backed by our own stock. Sizes run from 10 × 10 mm to 300 × 300 mm, with walls of 0.4–12 mm. Rectangular and oval pipe & tube are available in the same grades and finishes.
Wall 0.4–12 mm; 6 m standard, cut to 3, 9 or 12 m, or laser cut to size
Mill finish, No.4 or hairline (grit 180–320), or mirror
PVC film on finished faces; corners protected in packing
Made to ASTM A554 and EN 10296-2
Laser cut, brushed or polished in our own plant; lead time 8–12 working days
Why Order SS Square Pipe & Tube From MTS
01
10 × 10 to 300 × 300 mm
Stock sizes run from 10 × 10 to 200 × 200 mm, with 20, 25, 30, 40, 50, 60, 80, 100, 150 and 200 mm as standard sizes. Sizes above 200 × 200, up to 300 × 300 mm, are made to order. Decorative walls run 0.4–3.0 mm, and industrial walls 3.0–12 mm.
02
Straight and Untwisted
We check bow and twist per lot. Long rails and frames line up without forcing.
03
Finished Faces Ready to Fit
Satin or mirror faces leave our plant polished and filmed. Brushing (grit 180–320) and polishing run on our own lines. You cut and weld, then peel.
04
Weld Seam on One Face
The seam sits on a known face, so you can turn it out of sight on visible parts.
05
Cut to Your Drawing on Our Tube Laser
Our tube laser cuts lengths, notches, holes and miters in square and rectangular tube, up to 350 mm and 9 m long, with walls up to 10 mm. Frame parts arrive ready to weld.
06
Processing and Delivery From Wuxi
We process up to 100,000 tons a month and keep 3,000 tons of stainless pipe & tube in stock (out of 80,000 tons in total) in 60,000 m² of warehouse space in Wuxi. Our own cranes load each container for Shanghai, Qingdao or Tianjin.
Clean Lines for Frames, Rails and Machines
Square and rectangular pipe & tube give flat faces to bolt, weld and mount. They resist bending better than round tube of the same weight.
That is why stainless steel square pipe & tube frame food machines, kitchen equipment, shop fittings, gates and balustrades. In 304 they stay clean indoors. In 316 they hold their finish outdoors and near the sea.
Square, Rectangular and Oval Range
SS 304 Square Pipe & Tube
The standard grade for indoor frames, furniture and food machines. 10 × 10 mm to 300 × 300 mm.
316 Square Pipe & Tube
For coastal railings, pool areas and marine fittings. 316 square tube comes in the same sizes, walls and lengths as 304.
Stainless Steel Rectangular Pipe & Tube
Rectangular sizes fall in the same 10–300 mm range, with walls of 0.4–12 mm. 304 stainless steel rectangular tube for frames, rails and door profiles. Also sold as rectangular ss pipe.
Stainless Steel Oval Pipe & Tube
Flat oval and elliptical sections from 15 × 8 mm to 195 × 100 mm, for handrails, furniture legs and trim. Stock sizes include 20 × 40, 25 × 50, 30 × 60, 40 × 80 and 50 × 100 mm, the usual handrail sizes. SS oval pipe in 201, 304 and 316.
Sizes above 150 × 80 mm are rarely in stock, and sizes close to 195 × 100 mm usually need a custom die. Decorative walls run 0.4–3.0 mm, most often 0.6, 0.8, 1.0, 1.2, 1.5 or 2.0 mm. Structural walls of 3.0–5.0 mm are made to order. Standard length is 6 m, cut to any length, with 12 m as the maximum.
Square Pipe & Tube for Railings
SS railing square pipe for posts and top rails. Matching fittings are quoted on request.
Small Hollow Sections
Hollow stainless 1x1 inch (25.4 mm) and 1/2" square for light frames and displays, with decorative walls from 0.4 mm.
Specifications
| Item | Range |
|---|---|
| Grades | 201, 304, 316, 316L; S32001 made to order |
| Square | 10 × 10 – 300 × 300 mm; stock to 200 × 200 mm, larger made to order |
| Rectangular | Within the same 10–300 mm range |
| Oval / flat oval | 15 × 8 – 195 × 100 mm; wall 0.3–5.0 mm (stock 0.4–3.0 mm; 3.0–5.0 mm to order) |
| Wall | Decorative 0.4–3.0 mm (from 0.24 mm on request); industrial 3.0–12 mm |
| Length | 6 m standard; cut to any length, including 3, 9 or 12 m; max 12 m |
| Finish | Mill finish, No.4 / satin (grit 180–320), hairline, mirror (No.8) |
| Standards | ASTM A554 (decorative), ASTM A500 (structural), EN 10296-2, EN 10219 |
| Process | Welded, ERW cold formed (almost all stock); seamless square, extruded, walls from 3 mm, to order |
How to Order Stainless Steel Square Pipe & Tube
Size, Wall and Corner Radius
Square pipe & tube are sold by outside size × wall, such as 40 × 40 × 1.5 mm. Schedule and NPS do not apply.
Ask about corner radius if parts must fit flush. Cold formed square tube has an outside radius of about 1.5 to 2.5 times the wall. Sharp corner tube, made by extra forming, costs more but looks crisper on furniture and display parts.
Which Standard?
Most stainless square tube is made to ASTM A554. A554 covers welded mechanical and ornamental tubing, including square, rectangular and oval shapes. You will see it written as ASTM A554-16 or a later year.
A554 tube is not meant for pressure. If your frame carries structural loads, ask for ASTM A500 or EN 10219 or a project-specific spec. For fluid lines, use round pipe & tube instead.
Almost all square tube is welded, ERW cold formed. Seamless square tube is extruded, with walls from about 3 mm, for heavy machinery. It is rarely stocked and is made to order.
304, 316 or 201?
304 is right for indoor frames, kitchens and food machines. It welds well and stays clean with normal care.
Choose 316 for outdoor railings within a few kilometers of the sea, pool areas and de-icing salt zones. 304 tends to tea-stain there.
201 costs less, with lower nickel. 201 and 304 are the usual grades for decorative railings, doors and windows. Keep 201 to dry indoor decoration. Don’t use it outdoors or in food contact.
Square, Rectangular or Oval?
Square tube carries load equally in both directions. It is the default for posts and table legs.
Rectangular tube puts more steel where the bend is. For a beam that bends one way, it is stronger per kilogram than square. Set the long side vertical.
Oval tube is chosen for looks and grip. It fits handrails and furniture where a round section looks too plain.
Finish and Weld Seam
For visible parts, order the finish before cutting. Satin #320 is the most common for railing and furniture. Mirror finish shows every mark, so it needs film and careful handling. For polishing options in detail, see Polished Stainless Steel Pipe & Tube.
The weld seam runs along one face. On satin tube it is polished out and hard to see. On mirror tube it may show. Turn the seam face inward on your design.
Avoiding Problems in Fabrication
Thin wall square tube can dent in clamps. Use soft jaws.
Welding heat leaves tint on the faces. Pickle or polish welds on 316 used outdoors. Otherwise, the heat tint will rust first.
Frequently Asked Questions
Is ss square tube the same as stainless steel square pipe?
Yes. Buyers use both names for the same product. Square sections are always sold by outside size × wall, so "pipe" here does not mean NPS sizing. Send size, wall, grade and finish.
What is the most common size for railing posts?
For ss railing square pipe posts, 40 × 40 mm and 50 × 50 mm are common. Wall is usually 1.5–2.0 mm. Top rails often use 40 × 20 mm rectangular or a round or oval section. Local building codes set the load each post must carry.
Can you cut square pipe & tube to length?
Yes. Our tube laser cuts lengths, notches and holes, up to 350 mm and 9 m long. Cut pieces are packed with film intact.
What lengths can you supply?
Standard length is 6 m, and we cut to any length, including 3, 9 or 12 m. The maximum single length is 12 m. Lengths up to 11.8 m fit a 40HQ container; longer pieces ship as break bulk. Shorter pieces are laser cut to your drawing.
How much does stainless square tube cost?
Price depends on grade, size, wall, finish and quantity. Mirror finish and thin wall add cost. Nickel prices move the base price. Send your size list and we will quote within 2–4 working hours.
Request a Quote
We reply within 2–4 working hours with a price per ton, valid for 3 days.