Stainless Steel Pipes Manufacturer in India
Stainless Steel Rectangular Pipe Manufacturer in India
Sachiya Steel International is a leading Stainless Steel Rectangular Pipe Manufacturer in India, established in 2005 and based in Mumbai. With over 20+ years of experience, we manufacture, supply, and export stainless steel rectangular pipes in grades such as 304, 304L, 316, 316L, and 321. Our pipes are available in different sizes, wall thicknesses, and finishes to meet various industrial and engineering requirements.
We serve customers across 85+ countries and supply pipes for construction, fabrication, chemical, pharmaceutical, marine, and other industries. Our ISO 9001:2015 and TÜV certifications reflect our focus on quality and reliable service. Products are supplied according to relevant ASTM and ASME standards, with material test certificates available for quality assurance and traceability. We also handle bulk orders and project requirements with a focus on timely delivery and consistent product quality.
What Is Stainless Steel Rectangular Pipe?
A Stainless Steel Rectangular Pipe is a hollow steel section with a rectangular shape, made from stainless steel. It is available in welded and seamless options, with different sizes and wall thicknesses to suit various applications. Its flat surfaces and strong corners make it easy to cut, weld, and fit into different designs. These pipes are widely used in construction, frames, handrails, furniture, machinery, and decorative structures because they offer good strength, corrosion resistance, and a clean finish.
Stainless Steel Rectangular Pipes
High-quality stainless steel rectangular pipes manufactured for demanding applications across chemical, petrochemical, power generation, marine, construction and engineering industries. Available in multiple grades, sizes, wall thicknesses and surface finishes.
Why Choose Stainless Steel Rectangular Pipe?
Stainless Steel Rectangular Pipe is widely used in industrial, structural, and decorative applications because of its strength, durability, and clean appearance. It is available in different grades, sizes, and finishes to suit various project requirements.
- High Strength: Provides reliable support for frames, structures, and equipment.
- Corrosion Resistance: Helps resist rust and corrosion, depending on the stainless steel grade and working environment.
- Easy Fabrication: Flat surfaces make cutting, welding, and installation easier.
- Low Maintenance: Requires minimal upkeep when properly selected and maintained.
- Multiple Finishes: Available in satin, mirror, and pickled finishes for different applications.
- Wide Applications: Suitable for handrails, furniture, construction, machinery, and architectural projects.
Choosing the right grade, size, and wall thickness helps ensure good performance and long service life. These pipes offer a practical solution for projects that require strength, corrosion resistance, and a neat finish.
Types of Stainless Steel Rectangular Pipe
As a Stainless Steel Rectangular Pipe Manufacturer, we offer different types of pipes to meet various industrial, structural, and decorative requirements.
- Welded Rectangular Pipe: Made by forming stainless steel strips and welding the edges, suitable for frames, handrails, and general fabrication.
- Seamless Rectangular Pipe: Made from seamless stainless steel tubes and shaped into a rectangular section for specific engineering applications.
- Satin Polished Rectangular Pipe: Features a smooth, brushed finish for handrails, furniture, and interior designs.
- Mirror Polished Rectangular Pipe: Offers a shiny, reflective surface for architectural and decorative applications.
- Pickled Rectangular Pipe: Has a cleaned surface suitable for industrial and equipment applications.
- Heavy Wall Rectangular Pipe: Designed for structural frames, supports, and applications requiring thicker walls.
- Thin Wall Decorative Pipe: Lightweight and suitable for furniture, display frames, signage, and decorative work.
Choosing the right type depends on the required strength, surface finish, dimensions, and intended application.
Types of Pipes & Tubes
Explore our range of industrial pipes and tubes, manufactured for different applications, materials, specifications and engineering requirements.
Pipes and Tubes
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Seamless Pipes
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ERW Pipes
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LSAW Pipes
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SSAW Pipes
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Seamless Tubes
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Welded Pipes
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Welded Tubes
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Box Pipes
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Box Tubes
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Brass Pipes
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Heat Exchanger Tubes
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Boiler Tubes
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Aluminium Pipes
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Carbon Steel Seamless Pipes
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Carbon Steel Pipe
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Stainless Steel Pipe
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Alloy Steel Pipe
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Duplex Steel Pipe
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Super Duplex Steel Pipe
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Nickel Alloy Pipe
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Copper Nickel Alloy Pipe
→Get Certified Stainless Steel Rectangular Pipes at Competitive Factory Prices
Stainless Steel Rectangular Pipe Specifications
| Parameter | Details |
|---|---|
| Material | Stainless steel 304, 304L, 316, 316L, 321 |
| Shape | Rectangular (square also available) |
| Manufacturing | TIG welded, ERW welded, seamless |
| Size (width × height) | 10 × 20 mm to 200 × 100 mm, larger on request |
| Wall thickness | 0.8 mm to 12 mm |
| Corner | Small radius, formed to the wall thickness |
| Weld seam | Ground flush and polished on request |
| Length | 6 m standard, cut length up to 12 m |
| Surface finish | Pickled, 2B, No. 4 satin, 240 grit, mirror |
| Tests | Chemical analysis, tensile, dimensional, weld seam check, PMI |
| Documents | EN 10204 3.1 mill certificate, inspection reports |
Stainless Steel Rectangular Pipe Standards
| Standard | What it covers |
|---|---|
| ASTM A554 | Welded stainless mechanical tubing, including rectangular and square |
| ASTM A511 | Seamless stainless mechanical tubing |
| JIS G3446 | Stainless tubes for machine and structural use |
| ASTM A380 / A967 | Cleaning and passivation of stainless parts |
| ASTM A262 | Intergranular corrosion testing, on request |
Material and Grades of Stainless Steel Rectangular Pipe
304: The most widely used grade. It resists corrosion well in indoor and general outdoor use, and takes a good polish.
304L: Low carbon, preferred when the sections are heavily welded.
316: Adds molybdenum for better resistance to salt, chlorides and chemicals. It is the pick for coastal and marine use.
316L: Low-carbon 316 for welded structures in tough environments, including food, pharma and waterfront work.
321: Stabilised with titanium for sections that see sustained heat, such as furnace racks and exhaust frames.
For rectangular pipe, the right grade depends mostly on where it will stand. Indoors, 304 is usually enough. Near the sea or in polluted air, 316L lasts far longer.
Stainless Steel Rectangular vs Square vs Round Pipe: Which Shape Do You Need?
| Point | Rectangular | Square | Round |
|---|---|---|---|
| Bending strength | Highest along the long side | Equal in both directions | Equal in all directions |
| Look | Modern, flat, linear | Modern, uniform | Classic, smooth |
| Joining | Flat faces weld, bolt and clad easily | Same as rectangular | Needs saddle cuts |
| Best for | Beams, frames, handrails, supports | Posts, legs, frames | Rails and fluid pipelines |
| Carrying fluids under pressure | Not recommended | Not recommended | Best choice |
Choose rectangular pipe for beams, frames and rails that carry load in one direction. Choose square pipe when the load comes from both directions. If you need to move a liquid or gas under pressure, use round pipe, as the corners of a rectangle do not handle internal pressure well.
Stainless Steel Rectangular Pipe Chemical Composition
| Element | 304 (%) | 304L (%) | 316L (%) | 321 (%) |
|---|---|---|---|---|
| Carbon (C) | 0.08 max | 0.03 max | 0.03 max | 0.08 max |
| Manganese (Mn) | 2.00 max | 2.00 max | 2.00 max | 2.00 max |
| Silicon (Si) | 1.00 max | 1.00 max | 1.00 max | 1.00 max |
| Phosphorus (P) | 0.045 max | 0.045 max | 0.045 max | 0.045 max |
| Sulphur (S) | 0.030 max | 0.030 max | 0.030 max | 0.030 max |
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 | 16.0 – 18.0 | 17.0 – 19.0 |
| Nickel (Ni) | 8.0 – 11.0 | 8.0 – 12.0 | 10.0 – 14.0 | 9.0 – 12.0 |
| Molybdenum (Mo) | — | — | 2.00 – 3.00 | — |
| Titanium (Ti) | — | — | — | 5×(C+N) min, 0.70 max |
| Iron (Fe) | Balance | Balance | Balance | Balance |
Stainless Steel Rectangular Pipe Mechanical Properties
| Property | 304 / 316 / 321 | 304L / 316L |
|---|---|---|
| Tensile strength | 515 MPa min | 485 MPa min |
| Yield strength (0.2%) | 205 MPa min | 170 MPa min |
| Elongation (typical) | 35% | 35% |
| Hardness (typical) | 90 HRB max | 90 HRB max |
| Density | 7.93 g/cm³ (304), 7.98 g/cm³ (316, 321) | Same as base grade |
| Magnetic response | Non-magnetic when annealed | Non-magnetic when annealed |
Stainless Steel Rectangular Pipe Size and Weight Chart
Weight per metre for a rectangular section is 0.01586 × Wall × (Width + Height − 2 × Wall) for 304, 304L and 321, and 0.01596 × the same figure for 316 and 316L. All dimensions are in mm. The formula ignores corner radii, so actual weight is slightly lower.
Use factor 0.01586 for 304, 304L and 321, and 0.01596 for 316 and 316L. Width, height and wall are in mm. Multiply the result by the length to obtain the total weight.
| Size (W × H, mm) | Wall (mm) | 304 kg/m | 316 kg/m |
|---|---|---|---|
| 20 × 10 | 1.2 | 0.53 | 0.53 |
| 25 × 13 | 1.2 | 0.68 | 0.68 |
| 40 × 20 | 1.5 | 1.36 | 1.36 |
| 50 × 25 | 1.5 | 1.71 | 1.72 |
| 50 × 30 | 2.0 | 2.41 | 2.43 |
| 60 × 40 | 2.0 | 3.05 | 3.06 |
| 80 × 40 | 2.0 | 3.68 | 3.70 |
| 100 × 50 | 2.5 | 5.75 | 5.79 |
| 100 × 60 | 3.0 | 7.33 | 7.37 |
| 120 × 60 | 3.0 | 8.28 | 8.33 |
| 150 × 100 | 3.0 | 11.61 | 11.68 |
| 200 × 100 | 4.0 | 18.52 | 18.64 |
Stainless Steel Rectangular Pipe Sizes, Dimensions and Tolerances
Rectangular pipe is ordered by width, height and wall in mm. The table lists common wall thicknesses for each size range.
| Size range (W × H, mm) | Common wall range (mm) | Typical use |
|---|---|---|
| 20 × 10 to 40 × 20 | 0.8 – 1.5 | Furniture, trim, light frames |
| 50 × 25 to 60 × 40 | 1.2 – 2.5 | Handrails, shop fittings, frames |
| 80 × 40 to 100 × 60 | 1.5 – 3.0 | Balustrade posts, support frames |
| 120 × 60 to 150 × 100 | 2.0 – 4.0 | Structural beams, equipment frames |
| 200 × 100 and above | 3.0 – 12.0 | Heavy structural work |
Wall thickness tolerance on A554 tubing is typically ±10%. Straightness, twist and corner shape are checked before dispatch. Standard length is 6 m, and cut lengths up to 12 m, mitred ends and punched or drilled sections are made to your drawing.
Surface Finishes of Stainless Steel Rectangular Pipe
| Finish | What it is | Where it is used |
|---|---|---|
| Pickled and annealed | Acid-cleaned industrial finish | Plant frames, process equipment |
| 2B / mill | Smooth, matt factory finish | General fabrication |
| No. 4 satin (180 grit) | Soft linear brushed grain | Handrails, interiors, facades |
| 240 grit satin | Finer, more even grain | Hygienic equipment, kitchens |
| Mirror (No. 8) | Buffed to a reflective shine | Architecture and decor |
| Weld seam polished | Seam ground flush and blended | Any visible installation |
Testing and Inspection of Stainless Steel Rectangular Pipe
| Test | Purpose |
|---|---|
| Chemical analysis | Confirms the grade against the standard |
| Tensile test | Checks strength and elongation |
| Dimensional check | Measures width, height, wall and corner radius |
| Straightness and twist | Confirms the section is true and does not twist along its length |
| Weld seam check | Eddy current or visual inspection of the seam, dye penetrant on request |
| Surface inspection | Checks finish for scratches, dents and weld marks |
| PMI | Confirms the alloy before dispatch |
| IGC to ASTM A262 | Checks resistance to intergranular attack, on request |
Common Materials Supplied with Stainless Steel Rectangular Pipe
We manufacture and supply stainless steel rectangular pipes along with a range of related products for industrial, construction, and fabrication applications. As experienced stainless steel rectangular pipe suppliers, we offer products in different grades, sizes, and specifications to meet varied project requirements.
Stainless Steel Square Pipe: Used for frames, support posts, furniture, and structural applications.
Stainless Steel Round Pipe: Suitable for handrails, railings, and industrial equipment.
Angles, Channels and Flat Bars: Used for supports, brackets, and fabrication work.
Stainless Steel Sheets and Plates: Suitable for cladding, panels, enclosures, and industrial components.
End Caps and Handrail Fittings: Provide a neat finish to pipe ends and railing systems.
Duplex 2205 Hollow Sections: Offer high strength and improved resistance to chloride corrosion.
With manufacturing, supply, and export capabilities, we provide stainless steel products in various grades and specifications for industrial and engineering projects across 85+ countries.
Applications of Stainless Steel Rectangular Pipe
- Architecture and Construction: Handrails, balustrades, facades, canopies and curtain wall frames.
- Furniture and Interiors: Tables, shelving, partitions and shopfitting frames.
- Food Processing: Equipment frames, conveyors and support structures in washdown areas.
- Pharmaceutical and Hospitals: Equipment stands, carts, cleanroom frames and handrails.
- Marine and Coastal: Deck railings, gangways and waterfront structures in 316L.
- Transport and Rail: Bus and train body frames, station furniture and handrails.
- Commercial Kitchens: Work tables, racks and hood frames.
- Water and Wastewater: Walkways, supports and covers where steel must not rust.
Why Choose Us as Your Stainless Steel Rectangular Pipe Manufacturer in India?
Established in 2005, we bring 20+ years of experience in manufacturing and exporting stainless steel pipes and tubes. With ISO 9001:2015 and TÜV certifications, we focus on product quality, accurate dimensions, and reliable supply. As a trusted stainless steel rectangular pipe Supplier in India, we have a production and supply capacity of up to 100 tons per month, serving customers across 85+ countries.
Wide Grade Selection: We manufacture rectangular pipes in grades 304, 304L, 316, 316L, and 321 for different industrial and structural applications.
Custom Sizes and Finishes: Our range includes various dimensions, wall thicknesses, and surface finishes to suit specific project needs.
Quality Checks: We focus on dimensional accuracy, straightness, weld quality, and surface finish to maintain consistent product standards.
Quality Documentation: Material test certificates and additional inspections are available as per project requirements.
Bulk Supply Capability: Our monthly capacity of up to 100 tons supports regular orders, bulk requirements, and project supplies.
Worldwide Exports: We supply stainless steel rectangular pipes to customers in 85+ countries, with export documentation and packaging support.
Our focus on manufacturing quality, flexible specifications, and dependable delivery makes us a reliable choice for stainless steel rectangular pipe requirements across various industries.
Countries We Export Stainless Steel Rectangular Pipe To
Our stainless steel rectangular pipes reach customers in 85+ countries around the world. We supply products for a wide range of industries, including construction, food processing, pharmaceuticals, marine, and engineering. Our export experience helps us manage different order sizes, product specifications, and shipping requirements for international projects.
Middle East: UAE, Saudi Arabia, Qatar, Oman, Kuwait, and Bahrain.
European Markets: Germany, Italy, the United Kingdom, France, Spain, the Netherlands, Belgium, and Poland.
Asia-Pacific: Japan, Australia, Singapore, Malaysia, Indonesia, Thailand, Vietnam, and South Korea.
North and South America: USA, Canada, Mexico, Brazil, and Chile.
African Markets: South Africa, Nigeria, Egypt, and Kenya.
South Asian Markets: Nepal, Bangladesh, and Sri Lanka.
We check each order before dispatch and pack our pipes carefully to help prevent surface damage during transport. We also provide EN 10204 3.1 material test certificates with every order and can arrange EN 10204 3.2 certification or third-party inspections when needed. Our team prepares the required export documents to help make international deliveries smooth and hassle-free.
FAQs
Common questions about stainless steel rectangular pipe, grades, finishes, sizing and supply.
How do I calculate the weight of rectangular pipe?
Use 0.01586 × Wall × (Width + Height − 2 × Wall) for 304, with all values in mm, to get kg per metre. For 316, use 0.01596 in place of 0.01586.
Which grade should I use outdoors?
304 works for most outdoor use inland. Use 316 or 316L near the sea, in polluted air or where chlorides and de-icing salts are present.
What is the difference between rectangular and square pipe?
Rectangular pipe has two different side lengths and resists bending best along the long side. Square pipe has equal sides and handles loads from both directions.
Which standard applies to rectangular pipe?
ASTM A554 covers welded stainless mechanical tubing, including rectangular. ASTM A511 covers seamless mechanical tubing.
Can rectangular pipe carry water or gas?
It is designed for structural and decorative use. For pressurised fluids, round pipe is the better choice because corners weaken under internal pressure.
Is the weld seam visible?
On pickled pipe the seam is visible but neat. On satin and mirror pipe we grind and blend the seam flush so it virtually disappears.
Which finish is best for handrails?
No. 4 satin is the most popular because it hides fingerprints and scratches. Mirror finish gives a brighter, more formal look but shows every mark.
Can you supply seamless rectangular pipe?
Yes. Seamless rectangular pipe is shaped from seamless tube for loads and conditions where a weld seam is not wanted.
Do you supply cut lengths and mitred ends?
Yes. Standard length is 6 m, and we cut to length, mitre the ends and drill or punch sections to your drawing.
What wall thickness should I choose?
Light frames and furniture often use 1.0–2.0 mm. Handrail posts and support frames use 2.0–3.0 mm, and heavy structures use 3.0 mm and above. Tell us the load and span and we can suggest a wall.
Which documents come with an order?
EN 10204 3.1 mill test certificates are included. Inspection reports, PMI reports and third-party certificates are available on request.
How is rectangular pipe packed for export?
Each length is wrapped in protective film or paper to guard the finish, then bundled and strapped or crated. Heat numbers are marked on each bundle for traceability.