Stainless Steel LSAW Pipes Manufacturer in India
Stainless Steel LSAW Pipes Manufacturer in India
Sachiya Steel International is a leading stainless steel LSAW pipes manufacturer in India, established in 2005 with 20+ years of experience. We manufacture LSAW pipes from stainless steel plates for demanding applications such as desalination headers, bleach plants, flue gas scrubbers, and hot acid transfer lines. Our pipes range from 8″ to 48″ OD and include 304, 304L, 316, 316L, 321, 347, 904L, and duplex grades, manufactured to ASTM A358, A409, A312, and A790 standards.
We also work as a stainless steel LSAW pipes supplier in India, offering forming, welding, annealing, pickling, cutting, and beveling services. We export to 85+ countries and can support standard, bulk, and project requirements. We examine each weld, pressure test every pipe, and provide an EN 10204 3.1 certificate with orders. Our quality systems include ISO 9001:2015 and PED 2014/68/EU certifications, supporting quality, traceability, and technical compliance.
What Are Stainless Steel LSAW Pipes?
Stainless steel LSAW pipes are large-diameter pipes made from stainless steel plate with a straight weld running along their length. LSAW means Longitudinal Submerged Arc Welded. They are also known as DSAW (Double Submerged Arc Welded) pipes, while some applications refer to them as EFW (Electric Fusion Welded) pipes under fusion-welded stainless steel standards such as ASTM A358.
The manufacturing process starts with carefully inspected stainless steel plate. The long edges are prepared for welding, and the plate is formed into a round shape using JCO, UO, or three-roll bending methods. The seam is then welded from both the inside and outside. Depending on the grade and application, TIG or plasma welding may be used for the root, followed by submerged arc welding. The filler metal matches the pipe grade, such as 308L for 304L and 316L for 316L.
After welding, the pipe undergoes solution annealing at around 1,040°C or higher to restore corrosion resistance in the weld area. We then straighten and size the pipe before pickling and passivation. Welds can be checked using radiographic or ultrasonic testing, followed by hydrostatic testing. Since LSAW pipes use thick stainless steel plate, they can handle large diameters and heavy wall thicknesses for demanding applications.
Stainless Steel LSAW Pipes
High-quality stainless steel LSAW pipes manufactured for demanding industrial applications across oil & gas, petrochemical, chemical, power generation, marine, construction and engineering industries. Available in various sizes, grades, wall thicknesses and international standards.
Types of Stainless Steel LSAW Pipes
Stainless steel LSAW pipes are available in different grades to meet requirements for corrosion resistance, strength, temperature, and pressure. The right grade depends on the application, operating environment, pipe dimensions, wall thickness, and required standards.
- 304 LSAW Pipes: Suitable for water, food processing, construction, fabrication, and general industrial applications.
- 304L LSAW Pipes: Lower carbon content helps maintain corrosion resistance in welded areas and supports demanding fabrication work.
- 316 LSAW Pipes: Molybdenum improves resistance to chlorides and chemicals, making this grade useful for marine and chemical applications.
- 316L LSAW Pipes: Offers good corrosion resistance and weldability for pharmaceutical, food processing, chemical, and marine systems.
- 321 LSAW Pipes: Titanium stabilization helps the material perform reliably at elevated temperatures.
- 347 LSAW Pipes: Niobium stabilization improves resistance to intergranular corrosion during high-temperature service.
- 904L LSAW Pipes: Higher nickel and molybdenum content provides strong resistance to aggressive acids and corrosive environments.
- Duplex LSAW Pipes: Combine high strength with good corrosion resistance for oil & gas, marine, chemical, and industrial applications.
- Super Duplex LSAW Pipes: Provide high strength and excellent chloride resistance for offshore and severe marine environments.
Choosing the right Stainless Steel LSAW Pipes Manufacturer helps ensure the required grade, dimensions, testing, documentation, and finish match the project specifications.
304L LSAW Pipes, 316L LSAW Pipes, 321 and 347 LSAW Pipes, 904L LSAW Pipes, Duplex LSAW Pipes, Stainless Steel LSAW Pipes Manufacturers and Suppliers in India
We are one of the stainless steel LSAW pipes manufacturers in India that EPC teams and process plants call when a line is large and the grade must be exact. We buy stainless steel plate from approved mills, form and weld it at our own facility near Mumbai, and ship annealed and pickled pipe.
For large water, chemical, and food plant lines, our 304L and 316L LSAW pipes carry the flow. For hot service, our 321 and 347 pipes hold their strength. For hot acids, our 904L pipes take the duty, and for seawater and offshore lines, our duplex and super duplex LSAW pipes bring strength and chloride resistance.
As a stainless steel LSAW pipes supplier, we treat the weld record and the surface as part of the product. Every pipe carries a heat number tied to its plate certificate, a weld map, and the test results your weld class requires. We cut to length, bevel the ends, and cap them against dirt, so the pipe arrives clean. Buyers comparing stainless steel LSAW pipes suppliers can send us their grade, OD, wall thickness, weld class, quantity, and port. We will reply with a price, a lead time, and the certificate type.
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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LSAW Pipes
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Box 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 LSAW Pipes at Competitive Factory Prices
Stainless Steel LSAW Pipes Specification
| Parameter | Details |
|---|---|
| Size Range | 8" to 48" OD (219.1 mm to 1219.2 mm) |
| Wall Thickness | 3 mm to 25 mm |
| Forming | JCO, UO, or three-roll plate bending |
| Welding | Longitudinal seam, inside and outside, TIG or plasma root with submerged arc fill, matching filler |
| Weld Class | ASTM A358 Class 1, 2, 3, 4, 5 |
| Grades | 304, 304L, 316, 316L, 321, 347, 904L, 2205, 2507 |
| Heat Treatment | Solution annealed and rapidly cooled |
| Surface Finish | Annealed and pickled, passivated, weld ground flush on request |
| Length | 6 m to 12 m, custom lengths on request |
| End Finish | Plain end, bevelled end (30° to 37.5°) |
| Testing | Radiography or UT of weld, hydrostatic, tensile, guided bend, PMI, IGC (A262), ferrite content (duplex) |
| Certificate | EN 10204 3.1 (3.2 on request) |
Stainless Steel LSAW Pipe Standards and Specifications
| What It Covers | Standard | Note |
|---|---|---|
| Fusion Welded Austenitic Pipe | ASTM A358 / ASME SA358 | The main standard for plate-welded stainless pipe, NPS 8 and up |
| Large Light-Wall Welded Pipe | ASTM A409 / ASME SA409 | Sizes 14" to 30", thin wall |
| Welded Austenitic Pipe | ASTM A312 / ASME SA312 | Smaller sizes up to about 24" |
| Welded Duplex Pipe | ASTM A790, ASTM A928 | A790 covers pipe made by welding, A928 covers fusion welded duplex |
| Dimensions | ASME B36.19M, ASME B36.10M | Large sizes are ordered by OD and wall |
| General Requirements | ASTM A999 | Tolerances, tests, and marking |
| Intergranular Corrosion Test | ASTM A262 Practice E | Checks for sensitisation |
| Cleaning and Passivation | ASTM A380, ASTM A967 | Sets the surface condition |
| Welding Qualification | ASME Section IX | Weld procedures and welder approvals |
| Design Code | ASME B31.3 | Process piping rules and joint factors |
| European Standard | EN 10217-7 | Welded stainless pressure tubes |
| Certificate | EN 10204 3.1 and 3.2 | Mill and independent inspector options |
ASTM A358 Weld Classes
| Class | Weld | Radiography |
|---|---|---|
| Class 1 | Double welded | Full |
| Class 2 | Double welded | None |
| Class 3 | Single welded | Full |
| Class 4 | Single welded | None |
| Class 5 | Double welded | Spot |
Stainless Steel LSAW Pipes Material and Grades
| Grade | UNS | EN No. | Typical PREN | Standard | Where It Fits |
|---|---|---|---|---|---|
| 304 | S30400 | 1.4301 | ~19 | A358, A312 | General process, water, food |
| 304L | S30403 | 1.4307 | ~19 | A358, A312, A409 | Welded large lines in mild chemicals |
| 316 | S31600 | 1.4401 | ~24 | A358, A312 | Chlorides, coastal air |
| 316L | S31603 | 1.4404 | ~24 | A358, A312, A409 | Welded large lines in pharma, chemical, marine |
| 321 | S32100 | 1.4541 | ~18 | A358, A312 | Hot service up to about 850°C |
| 347 | S34700 | 1.4550 | ~18 | A358, A312 | Hot service, refinery and power |
| 904L | N08904 | 1.4539 | ~35 | A358, A312 | Hot sulphuric and phosphoric acids |
| 2205 | S32205 | 1.4462 | ~35 | A790, A928 | Offshore, desalination, oil and gas |
| 2507 | S32750 | 1.4410 | ~42 | A790, A928 | Subsea, severe chloride service |
What Is the Difference Between Stainless Steel LSAW Pipes and Stainless Steel ERW Pipes?
The difference is the starting material, the weld, and the size. ERW pipes start as thin coil and weld with high-frequency current and no filler, so the mill makes them fast and cheap in small and medium sizes, up to about 24 inches. LSAW pipes start as thick plate and weld with arc welding and filler metal, so the mill reaches large diameters and heavy walls that coil mills cannot roll.
Choose ERW for small and medium lines with thin walls. Choose LSAW for large diameters, thick walls, and heavy-duty process or duct lines.
| Point | Stainless Steel LSAW Pipes | Stainless Steel ERW Pipes |
|---|---|---|
| Starting Material | Plate | Coil or strip |
| Welding Method | Arc welding with filler, inside and outside | High-frequency resistance, no filler |
| Governing Standard | ASTM A358, A409 | ASTM A312, A554 |
| Size Range | 8" to 48" and larger | 1/2" to 24" |
| Wall Thickness | Medium to very heavy | Thin to medium |
| Weld Examination | Radiography or UT by class | Eddy current along the seam |
| Weld Appearance | Visible bead, can be ground flush | Narrow, trimmed flush |
| Price | Higher | Lower |
| Best For | Large headers, ducts, desalination, chemical plants | Small and medium lines, handrails, frames |
Stainless Steel LSAW Pipes Chemical Composition
Chemistry sets corrosion resistance, strength, and weldability. Values are weight percent, maximum unless a range shows.
Austenitic Stainless Steel LSAW Pipes (ASTM A358, A312, A409)
| Grade | C | Mn | Si | P | S | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| 304 | 0.08 | 2.00 | 1.00 | 0.045 | 0.030 | 18.0–20.0 | 8.0–11.0 | – | – |
| 304L | 0.035 | 2.00 | 1.00 | 0.045 | 0.030 | 18.0–20.0 | 8.0–13.0 | – | – |
| 316 | 0.08 | 2.00 | 1.00 | 0.045 | 0.030 | 16.0–18.0 | 11.0–14.0 | 2.0–3.0 | – |
| 316L | 0.035 | 2.00 | 1.00 | 0.045 | 0.030 | 16.0–18.0 | 10.0–15.0 | 2.0–3.0 | – |
| 321 | 0.08 | 2.00 | 1.00 | 0.045 | 0.030 | 17.0–19.0 | 9.0–12.0 | – | Ti 5×(C+N) min–0.70 |
| 347 | 0.08 | 2.00 | 1.00 | 0.045 | 0.030 | 17.0–19.0 | 9.0–13.0 | – | Nb 10×C min–1.00 |
| 904L | 0.020 | 2.00 | 1.00 | 0.040 | 0.030 | 19.0–23.0 | 23.0–28.0 | 4.0–5.0 | Cu 1.0–2.0 |
Duplex and Super Duplex LSAW Pipes (ASTM A790, A928)
| Grade | C | Mn | Si | P | S | Cr | Ni | Mo | N | Other |
|---|---|---|---|---|---|---|---|---|---|---|
| 2205 | 0.030 | 2.00 | 1.00 | 0.030 | 0.020 | 22.0–23.0 | 4.5–6.5 | 3.0–3.5 | 0.14–0.20 | – |
| 2507 | 0.030 | 1.20 | 0.80 | 0.035 | 0.020 | 24.0–26.0 | 6.0–8.0 | 3.0–5.0 | 0.24–0.32 | Cu 0.50 max |
Stainless Steel LSAW Pipes Mechanical Properties
Mechanical properties show how much load the pipe carries before it stretches (yield) or breaks (tensile). Values are minimum unless marked max.
| Grade | Tensile Strength ksi (MPa) | Yield Strength ksi (MPa) | Elongation % | Hardness (max) |
|---|---|---|---|---|
| 304 | 75 (515) | 30 (205) | 35 | – |
| 304L | 70 (485) | 25 (170) | 35 | – |
| 316 | 75 (515) | 30 (205) | 35 | – |
| 316L | 70 (485) | 25 (170) | 35 | – |
| 321 | 75 (515) | 30 (205) | 35 | – |
| 347 | 75 (515) | 30 (205) | 35 | – |
| 904L | 71 (490) | 31 (220) | 35 | – |
| 2205 | 95 (655) | 65 (450) | 25 | 290 HBW / 30.5 HRC |
| 2507 | 116 (800) | 80 (550) | 15 | 310 HBW / 32 HRC |
Strength is only half the picture for a welded pipe, because design codes also give the weld a joint efficiency. Under ASTM A358, Class 1 and Class 3 pipes (fully radiographed) earn the highest joint efficiency, and the lower classes earn less. The mill test certificate lists the exact values for each heat, plus the weld test results.
Stainless Steel LSAW Pipe Size and Weight Chart
Stainless steel LSAW pipes use outside diameter and wall thickness in mm. The weights below are in kg per metre for 304 stainless steel, with a density of 7.93 g/cm³. Pipes in 316 weigh about 1% more, and duplex pipes weigh about 1% less.
| NPS | OD mm | 4 mm | 5 mm | 6 mm | 8 mm | 10 mm | 12 mm | 16 mm |
|---|---|---|---|---|---|---|---|---|
| 8" | 219.1 | 21.43 | 26.66 | 31.85 | 42.07 | 52.09 | 61.91 | 80.95 |
| 12" | 323.9 | 31.87 | 39.72 | 47.51 | 62.95 | 78.19 | 93.23 | 122.72 |
| 16" | 406.4 | 40.10 | 49.99 | 59.84 | 79.39 | 98.74 | 117.89 | 155.60 |
| 20" | 508.0 | 50.22 | 62.65 | 75.03 | 99.64 | 124.05 | 148.26 | 196.09 |
| 24" | 609.6 | 60.34 | 75.30 | 90.21 | 119.89 | 149.36 | 178.63 | 236.59 |
| 30" | 762.0 | 75.53 | 94.28 | 112.99 | 150.26 | 187.32 | 224.19 | 297.33 |
| 36" | 914.4 | 90.71 | 113.27 | 135.77 | 180.63 | 225.29 | 269.75 | 358.07 |
| 48" | 1219.2 | 121.08 | 151.23 | 181.32 | 241.37 | 301.21 | 360.86 | 479.55 |
To work out the weight of any size, use Weight (kg/m) = (OD − Wall) × Wall × 0.02491 for 304, with both values in mm.
Common Materials
Stainless steel LSAW pipes are available in several material grades, with austenitic stainless steels commonly used for applications involving water, food, chemicals, and general industrial service. Grade 304L (UNS S30403) offers good corrosion resistance, while 316L (UNS S31603) contains molybdenum for better resistance to chlorides and acids. Their low carbon content also helps protect the weld area after fabrication.
321 Stainless Steel: Titanium-stabilized grade that performs well at temperatures of around 425°C to 850°C.
347 Stainless Steel: Niobium-stabilized grade suitable for elevated-temperature applications and welded service.
904L (UNS N08904): Offers strong resistance to aggressive acids, including hot sulphuric and phosphoric acid.
Duplex 2205 (UNS S32205): Combines high strength with good resistance to chloride-related corrosion and stress cracking.
Super Duplex 2507 (UNS S32750): Provides higher strength and excellent resistance to severe chloride environments.
Experienced stainless steel LSAW pipe suppliers can provide these grades according to the required standard, weld class, surface finish, and inspection requirements. Engineers also use PREN = %Cr + 3.3 × %Mo + 16 × %N to compare resistance to pitting in chloride environments. A higher PREN value generally indicates better pitting resistance.
Available Sizes, Dimensions and Schedules
We make stainless steel LSAW pipes from 8" to 48" OD, in walls from 3 mm to 25 mm. Large pipes are ordered by outside diameter and wall thickness in mm, not by schedule number, although ASME B36.19M schedules like 10S and 40S still guide the wall for sizes up to 30". The standard sets the allowed tolerances on diameter, wall, and out-of-roundness. Because a welded pipe is rolled from plate, you can also order a non-standard diameter and wall if your drawing needs it. Standard lengths run from 6 m to 12 m, and we cut custom lengths on request.
As a stainless steel LSAW pipes supplier in India, we hold selected grades of plate in stock, subject to availability, and we form pipe to order.
| Product | Size Range | Wall Thickness | Lengths | Condition |
|---|---|---|---|---|
| ASTM A358 304L / 316L LSAW Pipes | 8" to 48" OD | 3 mm to 25 mm | 6 m to 12 m / custom | Annealed and pickled |
| ASTM A358 321 / 347 LSAW Pipes | 8" to 48" OD | 4 mm to 25 mm | 6 m to 12 m / custom | Annealed and pickled |
| ASTM A358 904L LSAW Pipes | 8" to 40" OD | 4 mm to 20 mm | 6 m to 12 m / custom | Annealed and pickled |
| ASTM A409 Light-Wall Large Pipes | 14" to 30" OD | 3 mm to 8 mm | 6 m to 12 m / custom | Annealed and pickled |
| Duplex LSAW Pipes (A790 / A928) | 8" to 48" OD | 4 mm to 25 mm | 6 m to 12 m / custom | Annealed and pickled |
Stainless Steel LSAW Pipes We Manufacture and Supply
| Product | Grades | Standard | Weld Class Options |
|---|---|---|---|
| Austenitic LSAW Pipes | 304, 304L, 316, 316L | ASTM A358, A312 | Class 1, 2, 3, 4, 5 |
| Stabilised LSAW Pipes | 321, 347 | ASTM A358 | Class 1, 2, 3, 4, 5 |
| High-Alloy LSAW Pipes | 904L | ASTM A358 | Class 1, 3, 5 |
| Light-Wall Large Pipes | 304L, 316L | ASTM A409 | As specified |
| Duplex and Super Duplex LSAW Pipes | 2205, 2507 | ASTM A790, A928 | As specified |
| Weld-Ground LSAW Pipes | 304L, 316L | ASTM A358 | Class 1, 3 |
Each product ships with the weld map, the heat numbers, the plate certificates, and the test reports your standard requires.
Applications of Stainless Steel LSAW Pipes
- Desalination and Water Treatment: Carry seawater, brine, and treated water in large headers.
- Chemical and Petrochemical Plants: Move hot acids, solvents, and process fluids in big-bore lines.
- Flue Gas Desulphurisation Systems: Handle corrosive gas ducts and slurry lines.
- Pulp and Paper Mills: Resist bleach liquors and hot chemicals.
- Power Plants: Serve hot process lines in 321 and 347.
- Food, Dairy and Pharmaceutical Plants: Carry bulk water and product in large clean lines.
- Oil and Gas and Offshore Platforms: Run seawater cooling and firewater mains in duplex.
- Fertilizer and Mining Plants: Carry acids and slurries.
- Architecture and Large Structures: Form large decorative columns and facade elements.
Why Choose Us as Your Stainless Steel LSAW Pipes Manufacturer in India?
We bring 20+ years of experience in the stainless steel pipe industry, with our business established in 2005. Over the years, we have built practical knowledge of plate forming, welding, heat treatment, finishing, testing, and documentation for demanding pipe requirements. This experience helps us understand project needs and supply pipes that match the required grade, dimensions, standards, and inspection requirements. Our range includes 304L, 316L, 321, 347, 904L, duplex, and super duplex grades for demanding industrial applications.
We also support customers looking for a dependable stainless steel LSAW pipes supplier in India for regular, bulk, and project orders. We manufacture and export up to 100 tons of stainless steel LSAW pipes every month, with pipe sizes from 8" to 48" OD. Our services include forming, welding, annealing, pickling, cutting, and beveling. We export to 85+ countries, examine welds, conduct pressure testing, and provide EN 10204 3.1 certificates with orders. Our ISO 9001:2015, ISO 14001:2015, ISO 45001:2018, and applicable TÜV certifications support quality, traceability, and consistent supply.
Countries We Export Stainless Steel LSAW Pipes To
We export stainless steel LSAW pipes to customers across 85+ countries, supporting EPC contractors, manufacturers, fabricators, distributors, engineering companies, and procurement teams. Our supply covers standard, bulk, and project requirements, with grades, sizes, testing, and documentation selected according to each project.
North America: United States, Canada, Mexico
Middle East: UAE, Saudi Arabia, Qatar, Kuwait, Oman, Bahrain
Europe: UK, Germany, France, Italy, Netherlands, Spain
Asia Pacific: Australia, Singapore, Malaysia, Indonesia, Thailand, Vietnam
Africa: South Africa, Egypt, Nigeria, Kenya, Algeria
South America: Brazil, Argentina, Chile, Peru, Colombia
With 20+ years of industry experience, we support customers with reliable manufacturing and supply. We can manufacture and export up to 100 tons of stainless steel LSAW pipes every month, helping suppliers, distributors, contractors, and end users manage regular and large-volume requirements with consistent quality and timely delivery.
Stainless Steel LSAW Pipes FAQs
Common questions about stainless steel LSAW pipe grades, weld classes, dimensions, testing, and supply.
Why do stainless steel LSAW pipes follow ASTM A358?
ASTM A358 is the standard for fusion welded austenitic stainless steel pipe made from plate, which is exactly how LSAW pipes are built. It sets the weld classes, the tests, and the heat treatment.
Which ASTM A358 class should I order?
Class 1 gives the highest joint efficiency, because the pipe is welded on both sides and fully radiographed, so it suits critical lines. Class 5 uses spot radiography at a lower cost. Class 2 and Class 4 skip radiography and suit low-risk service.
Should I choose 304L or 316L for a large-diameter line?
Choose 304L for water, food, and mild chemicals. Choose 316L when the line sees chlorides, brine, or dilute acids. Both grades hold low carbon, which protects the weld zone.
When does duplex make more sense than 316L for a big pipe?
Duplex 2205 gives nearly twice the yield strength of 316L, so you can use a thinner wall on a large diameter and save weight and cost. It also resists chloride stress cracking much better.
Are the pipes solution annealed after welding?
Yes. We heat every pipe to 1,040°C or higher and cool it quickly, which restores corrosion resistance in the weld zone.
Which filler metal do you use?
We use filler metal that matches the pipe grade, such as 308L for 304L and 316L for 316L, so the weld keeps the same corrosion resistance as the plate.
Can you grind the weld flush inside the pipe?
Yes, on request. A flush inside surface gives smoother flow and fewer crevices where deposits can collect.
Can you supply non-standard diameters and walls?
Yes. Because we roll pipe from plate, we can form many diameters and walls to your drawing.
What sizes do your stainless steel LSAW pipes come in?
We make pipes from 8" to 48" OD, in walls from 3 mm to 25 mm. Larger sizes and heavier walls are available on request.
What decides the price of stainless steel LSAW pipes?
Nickel and molybdenum prices, plate grade, diameter, wall thickness, weld class, inspection scope, quantity, and delivery port all shape the price. Send us your enquiry for a current quote.
Which certificate comes with the pipes?
Every order ships with an EN 10204 3.1 certificate. We issue 3.2 with third-party inspection on request.
Are you a stainless steel LSAW pipes manufacturer or a supplier?
Both. We manufacture the pipes and also work as a stainless steel LSAW pipes supplier in India, with plate in