Stainless Steel Rectangular Tube

Specifications

Product Name	Stainless Steel Rectangular Tube
Place of Origin	Tianjin, China
Cross Section Size	10×20mm ~ 100×200mm, custom sizes available
Wall Thickness	0.4mm – 6.0mm
Standard Length	3m / 6m; custom cut length up to 12m available
Surface Finishes	No.1, 2B, BA, Hairline, Mirror, polished ss rectangular tube
Custom Machining	Polishing, Punching, Bending, Precision Cutting
Minimum Order Quantity	5 Tons
Production Lead Time	10–18 working days
Executive Standards	ASTM A554, JIS G3446, GB/T 12770

Common Stainless Steel Grades for Rectangular Tubes

·  SUS201: Cost-effective ss rectangular pipe for indoor furniture and Ice cream truck shells with low corrosion exposure.

·  SUS202: Better rust resistance than SUS201, suitable for mild corrosive environments, yet inferior to SUS304.

·  SUS304 / SUS304L: Mainstream 304 stainless steel rectangular tube for long-term oxidation resistance indoors and outdoors.

·  SUS316 / SUS316L: Upgraded grade, 316 stainless steel rectangular tubing with outstanding chloride resistance for marine and chemical environments.

·  SUS321: Stabilized grade for exhaust and high-temperature working conditions, continuously resistant to 450–600°C.

·  SUS310S: Ultra-high temperature resistant grade, capable of enduring over 1000°C, ideal for kilns and high-heat furnace equipment.

·  SUS430: Ferritic stainless steel widely used for home appliance housings, kitchen cabinet frames and automotive decorative profiles.

·  SUS409L / SUS439: Dedicated for automotive exhaust brackets and exhaust treatment systems, favored by auto part exporters.

Mechanical properties by grade

SS Grade	Tensile strength（MPa）	Yield strength（MPa）	Elongation（%）	Hardness（HB）
SUS201	≥520	≥275	≥40	≤217
SUS202	≥520	≥275	≥40	≤223
SUS304 / SUS304L	≥520 / ≥480	≥205 / ≥175	≥40 / ≥40	≤201 / ≤187
SUS316 / SUS316L	≥520 / ≥480	≥205 / ≥175	≥40 / ≥40	≤217 / ≤202
SUS321	≥520	≥205	≥40	≤201
SUS310S	≥520	≥205	≥40	≤202
SUS430	≥450	≥205	≥22	≤183
SUS409L/SUS439	≥380 / ≥360	≥175 / ≥170	≥25 / ≥25	≤183 / ≤197

2 Main Production Processes

There are two distinct manufacturing technologies for stainless rectangular tubes, among which welded stainless rectangular tube is the most widely adopted.

1. Welded Stainless Steel Rectangular Tube

·  Slit stainless steel coils into narrow strips with target width.

·  Cold roll and curl strips into open round tube blanks, then further shaped into open rectangular profiles.

·  Seal the seam via combined TIG welding + plasma welding.

·  Post-processing including weld grinding, sizing and surface finishing.

2. Seamless Stainless Steel Rectangular Tube

· Hot-pierce solid stainless steel billets into hollow seamless round tubes.

·  Reduce outer diameter and wall thickness via multiple cold drawing / cold rolling passes.

·  Form rectangular cross-sections by pulling round tubes through custom rectangular dies.

·  Intersperse multi-pass cold drawing and intermediate annealing procedures.

·  Final treatment: pickling, straightening and polishing.

Welded VS Seamless SS Rectangular Tube

Item	Welded SS Rectangular Tube	Seamless SS Rectangular Tube
Raw Material	Stainless steel strip coil	Solid stainless steel billet
Forming Method	Cold roll forming + longitudinal welding	Hot piercing + multi-pass cold drawing
Weld Seam	With longitudinal weld seam	Seamless, no welding joint
Wall Thickness Range	0.3–5.0mm	1.0–10.0mm and above
Dimensional Precision	High	Relatively high
Surface Quality	Excellent, easy to produce polished stainless steel rectangular tubing	Good
Pressure Bearing Capacity	Moderate	Outstanding
Production Cost	Low, cost-efficient	High, 2–3 times higher than welded tube
Customization Flexibility	High, wide size options	Limited forming range
Applicable Standards	ASTM A554, JIS G3446, GB/T 12770	ASTM A269, JIS G3459, GB/T 14976

Core Product Advantages

✔ Excellent mechanical performance Rectangular cross-section delivers much stronger bending resistance than round tubes. Our stainless steel rectangular tubing supports welding, punching and customizable cutting to any required length.

✔ Superior corrosion resistance Chromium-nickel alloy forms a natural passive anti-rust film on the surface, enabling stable rust-free performance under diverse humid, salty and acidic environments.

✔ Customizable aesthetic appearance We supply multiple surface finishes including polished stainless steel rectangular tubing, hairline and matte surfaces to meet decorative requirements.

✔ Sanitary & food-grade safety Unlike galvanized or black carbon steel tubes, stainless rectangular hollow section fits sterile standards for pharmaceutical, food processing and biological laboratory applications.

Application Scenarios

• Decorative Construction: Handrails & balustrades for office buildings and shopping malls, curtain wall frames, landscape sculpture supports
• Food & Pharmaceutical Industry: Storage vessels for laboratories, pharmaceutical processing machinery, refrigeration units on food carts
• Fluid Transportation: Wastewater pipelines, pure water filtration, seawater and corrosive chemical discharge piping
• Municipal Infrastructure: Coastal guardrails, bridge decorative frames, public facility supports
• High-Temperature & Industrial Equipment: Boiler and kiln frames, high-temperature fluid conveying pipelines

Stainless steel rectangular tube size

Length × Width, mm	Wall thickness (mm)	Linear weight (kg/m)
20×10	1.0 / 1.5	0.46 / 0.67
20×40	1.0 / 1.5 / 2.0	0.92 / 1.36 / 1.78
50×25	1.0 / 1.5	1.23 / 1.81
40×60	1.0 / 1.5 / 2.0	1.55 / 2.31 / 3.05
50×30	2.0	2.41
40×80	1.0 / 1.5 / 2.0	1.87 / 2.78 / 3.68
100×50	1.0 / 1.5	2.95 / 4.35

The formula for calculating the weight per meter (kg/m) of a rectangular tube is:

Weight = [(Long Side + Short Side) × 2 / 3.14 - Wall Thickness] × Wall Thickness × Density Coefficient × 1 meter

• Density coefficient: For common stainless steels such as 304 and 316, the density coefficient is typically taken as 0.02491; the coefficient for 316L is 0.02507, while 310S has a higher density, with a coefficient of approximately 0.02507.
• Long side, short side, and wall thickness: Units are in millimeters (mm).

Stainless Steel Rectangular Tube VS Carbon Steel Rectangular Tube

Comparison Item	Stainless Steel Rectangular Tube	Carbon Steel Rectangular Tube
Anti-Corrosion Performance	Excellent, resistant to salt spray & acid	Prone to rust, galvanization required
Surface Appearance	Bright, smooth finish	Black oxidized rough surface
Production Cost	Higher	Low
Service Lifespan	Over 10 years with zero maintenance	Rust occurs within 2–3 years
Typical Application	Humid coastal areas, food equipment, decorative projects	Dry indoor steel structures, general support frames

Why Choose Glory Steel?

1. Complete advanced production lines: Integrated equipment covering slitting, cold forming, welding, weld seam grinding and surface polishing for stainless steel rectangular pipe manufacturing.
2. Mature professional technology: Strict online inspection guarantee leak-free welds, precise stainless steel rectangular tube sizes and defect-free surface finishes.
3. Strict quality control system: Every batch undergoes full inspection including raw material composition test, weld flaw detection and dimensional audit.
4. Trusted global market reputation: We serve worldwide clients with on-time delivery, factory-direct price, ISO certifications and multilingual sales teams.

Glory Steel factory, located in Tianjin, China, is an ISO 9001, ISO 14001, and CE-certified factory with an annual output of 100,000 tons. Specializing in the production of stainless steel square and rectangular tubes, as well as various SS steel round tubes. With our high-quality products and services, we export to over 120 countries.