Alloy 20 Pipes Manufacturer in India
Alloy 20 Pipes Manufacturers in India
Stainless Steel Pipe Manufacturers is an established Alloy 20 Pipes Manufacturer in India, with manufacturing and supply experience dating back to 2005. Based near Mumbai, with an export office in Mumbai, we manufacture, supply and export industrial pipes and tubes to customers across 85+ countries. Our product range covers stainless steel, duplex, super duplex, carbon steel, alloy steel and nickel alloy pipes and tubes in different grades, sizes, schedules, dimensions and finishes. We work with EPC contractors, fabricators, distributors, engineering companies and industrial buyers across demanding sectors.
Our operations are supported by ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018 certifications, along with PED 2014/68/EU and TUV approvals. We supply products to applicable ASTM, ASME, ANSI, DIN and ISO requirements, with material testing, inspection and traceability documentation as required. Every order includes an EN 10204 3.1 certificate, while 3.2 certification and third-party inspection are available on request.
What Are Alloy 20 Pipes?
Alloy 20 pipes are corrosion-resistant pipes made from UNS N08020, a nickel-iron-chromium alloy developed for handling aggressive chemical environments, especially sulphuric acid. The material is also known as 20Cb-3 and is commonly identified by EN material number 2.4660. Its combination of nickel, chromium, copper and molybdenum provides strong resistance to general corrosion, while niobium helps improve resistance to intergranular corrosion after welding.
Alloy 20 pipes are available in seamless and welded construction. Seamless pipes are produced from solid billets, while welded pipes are formed from plate or strip and welded before the required finishing and heat treatment. They can be supplied in different NPS sizes, schedules, wall thicknesses, lengths and finishes according to the applicable specification and project requirements.
Alloy 20 Pipes
High-quality Alloy 20 Pipes manufactured for demanding applications across chemical, petrochemical, pharmaceutical, power generation, food processing and engineering industries. Available in multiple sizes, wall thicknesses, grades and specifications.
Types of Alloy 20 Pipes
Our Alloy 20 Pipes range includes different manufacturing methods, wall thicknesses, sizes and finishes for chemical, process and acid-service applications. As an experienced Alloy 20 Pipes Manufacturer, we supply the following types:
- Seamless Alloy 20 Pipes: Manufactured to ASTM B729 without a welded seam, suitable for pressure and demanding chemical service.
- Welded Alloy 20 Pipes: Manufactured to ASTM B464 from plate or strip, offering a practical option for larger diameters.
- Cold-Drawn Alloy 20 Pipes: Provide closer dimensional control and a smoother surface, particularly for smaller and medium bore requirements.
- Hot-Finished Alloy 20 Pipes: Suitable for larger diameters and heavier wall requirements.
- Thin-Wall Pipes: Sch 5S and Sch 10S options for applications where a lighter wall is suitable.
- Standard-Wall Pipes: Sch 40S and Sch 80S for general process and chemical piping.
- Heavy-Wall Pipes: Sch 160 pipes for applications requiring greater wall thickness.
- Large-Diameter Pipes: Available in welded construction for larger size requirements.
- Annealed and Pickled Pipes: Heat treated and cleaned to provide a clean, scale-free surface.
- Plain-End and Bevelled-End Pipes: Supplied with suitable end preparation for installation and butt welding.
Seamless, Welded, Cold-Drawn and Hot-Finished Alloy 20 Pipes Manufacturers and Suppliers in India
We manufacture and supply Alloy 20 Pipes in seamless and welded construction, with cold-drawn and hot-finished options available for different service requirements. The right manufacturing method depends on the pipe size, pressure conditions, corrosion allowance, dimensional requirements and project specification.
- Seamless Alloy 20 Pipes (ASTM B729): Suitable for pressure service, small and medium bore piping, and demanding chemical applications where a welded seam is not preferred.
- Welded Alloy 20 Pipes (ASTM B464): A practical choice for larger diameters, with uniform wall thickness and efficient production from plate or strip.
- Cold-Drawn Alloy 20 Pipes: Provide closer dimensional control and a smoother surface, making them suitable for smaller bore and precision piping requirements.
- Hot-Finished Alloy 20 Pipes: Available for larger diameters and heavier wall requirements, including process headers and demanding industrial piping.
- Thin-Wall and Heavy-Wall Alloy 20 Pipes: Available across applicable schedules, including Sch 5S, Sch 10S, Sch 40S, Sch 80S and Sch 160.
- Annealed and Pickled Alloy 20 Pipes: Supplied in a heat-treated condition with a clean surface suitable for fabrication and welding.
Available dimensions include different outside diameters, wall thicknesses, lengths and end finishes, based on the required specification.
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→Get Certified Alloy 20 Pipes at Competitive Factory Prices
Alloy 20 Pipes Specification
| Item | Detail |
|---|---|
| Product | Alloy 20 Pipes |
| Grade | UNS N08020 (2.4660, 20Cb-3) |
| Process | Seamless (hot finished or cold drawn) or welded (TIG or plasma arc), then annealed |
| Pipe standards | ASTM B729 / ASME SB-729 (seamless), ASTM B464 / ASME SB-464 (welded) |
| General requirements | ASTM B829 (seamless), ASTM B775 (welded) |
| Dimensions | ASME B36.19M (Sch 5S, 10S, 40S, 80S), ASME B36.10M (Sch 160 and other walls) |
| Size reference | NPS 1/2 to 12 in the tables, other sizes on request |
| Length | Single random, double random or cut length |
| Ends | Plain or bevelled (ASME B16.25) |
| Heat treatment | Annealed |
| Surface | Pickled |
| Tests | Chemical analysis, tensile, flattening, hydrostatic or non-destructive test; weld tension test on welded pipe |
| Certificate | EN 10204 3.1 with every order, 3.2 on request |
| Inspection | Third-party inspection on request |
Alloy 20 Pipes Standards and Specifications
Alloy 20 pipe is bought to a pipe standard, with matching fitting and flange standards behind it. The table links each one to its job.
| Standard | Scope | Where it applies |
|---|---|---|
| ASTM B729 / ASME SB-729 | Seamless UNS N08020 pipe and tube | Seamless Alloy 20 pipe |
| ASTM B464 / ASME SB-464 | Welded UNS N08020 alloy pipe | Welded Alloy 20 pipe |
| ASTM B829 | General requirements for seamless nickel and nickel alloy pipe and tube | Tolerances and test rules for seamless pipe |
| ASTM B775 | General requirements for welded nickel and nickel alloy pipe | Tolerances and test rules for welded pipe |
| ASTM B366 | Factory-made wrought nickel and nickel alloy fittings | Matching butt-weld fittings (WP20CB) |
| ASTM B462 | Forged or rolled UNS N08020 flanges, fittings and valves | Matching flanges and forgings |
| ASTM B463 / B473 | UNS N08020 plate, sheet and strip / bar | Matching plate and bar |
| ASME B36.19M and B36.10M | Pipe dimensions and weights | OD and wall reference |
| ASME B16.25 | Butt-welding ends | Bevel angle and root face |
| EN 10204 | Types of inspection documents | 3.1 and 3.2 certificates |
Alloy 20 Pipes Material and Grades
Alloy 20 is a single grade, sold under a few names. The table lists the designations you will see on drawings and enquiries.
| Designation | Value |
|---|---|
| UNS | N08020 |
| Common name | Alloy 20, 20Cb-3 |
| EN / Werkstoff number | 2.4660 |
| Alloy type | Nickel-iron-chromium with copper and molybdenum, niobium stabilised |
| Seamless standard | ASTM B729 |
| Welded standard | ASTM B464 |
| Matching fittings | ASTM B366 WP20CB |
| Matching flanges | ASTM B462 |
| Matching weld filler | ER320LR / E320LR |
| Typical use | Sulphuric acid, phosphoric acid, pickling and chemical process lines |
What Is the Difference Between Alloy 20 Pipes and Stainless Steel 316L Pipes?
The short answer: Alloy 20 has much more nickel plus copper, which lets it resist sulphuric acid and chloride cracking where 316L fails. Use 316L for general and mild chemical service, and Alloy 20 where hot or strong acids attack stainless.
| Point | Alloy 20 Pipes | Stainless Steel 316L Pipes |
|---|---|---|
| Nickel | 32.0–38.0% | 10.0–14.0% |
| Chromium | 19.0–21.0% | 16.0–18.0% |
| Molybdenum | 2.0–3.0% | 2.0–3.0% |
| Copper | 3.0–4.0% | None |
| Stabiliser | Niobium | Low carbon only |
| Sulphuric acid | Strong resistance over a wide range | Limited |
| Chloride stress cracking | High resistance | Cracking can occur |
| Tensile strength, min | 551 MPa | 485 MPa |
| Yield strength, min | 241 MPa | 170 MPa |
| Cost | Higher | Lower |
| Common standards | ASTM B729, B464 | ASTM A312 |
Alloy 20 Pipes Chemical Composition
Chemistry gives Alloy 20 its resistance to sulphuric acid. The table shows the ASTM B729 and B464 limits, one element per row. Values are percentage by weight, maximum unless shown as a range or marked "min".
| Element | UNS N08020 (%) | Role in the alloy |
|---|---|---|
| Nickel (Ni) | 32.0–38.0 | Corrosion resistance, stress cracking resistance |
| Chromium (Cr) | 19.0–21.0 | Oxidation and general corrosion resistance |
| Copper (Cu) | 3.0–4.0 | Sulphuric acid resistance |
| Molybdenum (Mo) | 2.0–3.0 | Pitting and acid resistance |
| Niobium (Nb) | 8×C min, 1.00 max | Stabiliser against intergranular attack |
| Carbon (C) | 0.07 | Kept low and tied up by niobium |
| Manganese (Mn) | 2.00 | Deoxidiser |
| Silicon (Si) | 1.00 | Deoxidiser |
| Phosphorus (P) | 0.045 | Impurity limit |
| Sulphur (S) | 0.035 | Impurity limit |
| Iron (Fe) | Balance | Base metal |
Alloy 20 Pipes Mechanical Properties
Alloy 20 pipe is supplied annealed. The table gives minimum values under ASTM B729 and B464.
| Property | Minimum value |
|---|---|
| Tensile strength | 551 MPa (80 ksi) |
| Yield strength 0.2% | 241 MPa (35 ksi) |
| Elongation | 30% |
| Density | 8.08 g/cm³ (typical) |
Alloy 20 Pipes Size and Weight Chart
Weight depends on OD and wall thickness. Alloy 20 has a density of about 8.08 g/cm³, so we use this formula:
OD and wall are in mm. Example: NPS 2 Sch 40S is (60.3 − 3.91) × 3.91 × 0.02538 = 5.60 kg/m. Multiply by length for total weight. Walls for each schedule are listed in the next section.
| NPS | OD (mm) | Sch 10S (kg/m) | Sch 40S (kg/m) | Sch 80S (kg/m) |
|---|---|---|---|---|
| 1/2" | 21.3 | 1.03 | 1.30 | 1.66 |
| 1" | 33.4 | 2.15 | 2.58 | 3.33 |
| 2" | 60.3 | 4.04 | 5.60 | 7.70 |
| 3" | 88.9 | 6.65 | 11.62 | 15.72 |
| 4" | 114.3 | 8.61 | 16.54 | 22.97 |
| 6" | 168.3 | 14.23 | 29.09 | 43.80 |
| 8" | 219.1 | 20.55 | 43.79 | 66.53 |
| 10" | 273.1 | 28.60 | 62.07 | 83.93 |
| 12" | 323.9 | 37.04 | 76.04 | 100.31 |
Available Sizes, Dimensions and Schedules
Alloy 20 Pipes follow ASME B36.19M for Sch 5S, 10S, 40S and 80S, and ASME B36.10M for Sch 160. A schedule is a wall-thickness code, so for the same OD a higher number means a thicker wall. Acid lines often run on the lighter schedules because Alloy 20 is strong, but confirm the wall against the design code and your corrosion allowance. Other sizes and walls can be quoted on request.
| NPS | OD (mm) | Sch 5S (mm) | Sch 10S (mm) | Sch 40S (mm) | Sch 80S (mm) | Sch 160 (mm) |
|---|---|---|---|---|---|---|
| 1/2" | 21.3 | 1.65 | 2.11 | 2.77 | 3.73 | 4.78 |
| 1" | 33.4 | 1.65 | 2.77 | 3.38 | 4.55 | 6.35 |
| 2" | 60.3 | 1.65 | 2.77 | 3.91 | 5.54 | 8.74 |
| 3" | 88.9 | 2.11 | 3.05 | 5.49 | 7.62 | 11.13 |
| 4" | 114.3 | 2.11 | 3.05 | 6.02 | 8.56 | 13.49 |
| 6" | 168.3 | 2.77 | 3.40 | 7.11 | 10.97 | 18.26 |
| 8" | 219.1 | 2.77 | 3.76 | 8.18 | 12.70 | 23.01 |
| 10" | 273.1 | 3.40 | 4.19 | 9.27 | 12.70 | 28.58 |
| 12" | 323.9 | 3.96 | 4.57 | 9.53 | 12.70 | 33.32 |
Tolerances on OD, wall and length follow ASTM B829 for seamless pipe and ASTM B775 for welded pipe, and they depend on pipe size.
Common Materials in Alloy 20 Pipes
We manufacture and supply Alloy 20 Pipes together with the materials that match them in a piping system, so the whole line has the same corrosion resistance.
UNS N08020 (2.4660): The base alloy, also sold as 20Cb-3, with about 35% nickel, 20% chromium, 3.5% copper and 2.5% molybdenum.
ASTM B366 WP20CB fittings: Elbows, tees, reducers and caps in the same alloy.
ASTM B462 flanges and forgings: Forged flanges and fittings in UNS N08020.
ASTM B463 and B473 plate and bar: Matching plate, sheet and bar for fabricated parts.
ER320LR and E320LR weld filler: Low-carbon matching filler for joining Alloy 20 pipe on site.
These products form part of our supply range as Alloy 20 Pipes Suppliers, with different sizes, schedules and finishes available according to the required specification.
Alloy 20 Pipes We Manufacture and Supply
We make Alloy 20 Pipes in the forms below. The form follows the pressure, the size and the service.
| Form | Standard | Typical use |
|---|---|---|
| Seamless, cold drawn | ASTM B729 | Small-bore acid and instrument lines |
| Seamless, hot finished | ASTM B729 | Medium and heavy-wall process headers |
| Welded, thin wall | ASTM B464 | Large-diameter acid ducts and low-pressure lines |
| Welded, standard wall | ASTM B464 | General process piping |
| Sch 160 heavy wall | ASTM B729 | High-pressure acid lines |
Applications of Alloy 20 Pipes
- Sulphuric acid plants: Acid transfer, dilution and storage lines.
- Chemical processing: Reactor, transfer and utility lines for aggressive chemicals.
- Pickling lines: Acid circulation piping and heating coils.
- Pharmaceutical industry: Process lines for acid-bearing intermediates.
- Fertiliser plants: Phosphoric acid and mixed-acid lines.
- Petrochemical plants: Process piping where hot acid and chlorides are present.
- Synthetic rubber and plastics: Monomer and acid-bearing process lines.
- Food processing: Acid-bearing process piping in processing lines.
- Dyes and pesticides: Reaction and transfer piping for corrosive intermediates.
Why Choose Us as Your Alloy 20 Pipes Manufacturer in India?
Since 2005, we have been manufacturing and supplying pipes and tubes in India, giving us strong practical expertise in producing and handling Alloy 20 Pipes for demanding industrial applications. We manufacture and supply seamless and welded Alloy 20 pipes in commonly required sizes, including small, medium and large diameters, with schedules such as Sch 5S, Sch 10S, Sch 40S, Sch 80S and Sch 160, subject to the applicable specification. Our range includes UNS N08020 / 20Cb-3, with different wall thicknesses, lengths and finishes available for project requirements.
As an experienced Alloy 20 Pipes Supplier in India, we can manufacture and export up to 100 tons per month, depending on product specifications and order requirements. Our quality credentials include ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018, along with PED 2014/68/EU and TUV approvals. Every order includes an EN 10204 3.1 certificate, while 3.2 certification and third-party inspection are available on request. We export to 85+ countries and handle both standard and project-specific requirements.
Countries We Export Alloy 20 Pipes To
We are Alloy 20 Pipe Suppliers serving customers in 85+ countries worldwide. Our Alloy 20 pipes are supplied for chemical, pharmaceutical, fertiliser and acid-handling projects. We work with international specifications and arrange the required material documentation, inspection and shipment details for each order.
Middle East: UAE, Saudi Arabia, Qatar, Oman, Kuwait and Bahrain
Europe: Germany, Italy, United Kingdom, Netherlands, France, Spain and Belgium
Asia-Pacific: Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan and Australia
North and South America: USA, Canada, Mexico and Brazil
Africa: South Africa, Nigeria, Egypt and Kenya
For overseas requirements, EN 10204 3.1 certification is supplied with every order. EN 10204 3.2 certification and third-party inspection can be arranged when specified.
Alloy 20 Pipes FAQs
Common questions about Alloy 20 pipe grades, acid service, welding, dimensions, and supply.
Which chemicals suit Alloy 20 pipes?
Alloy 20 is made for sulphuric acid and also handles phosphoric acid and many organic acids and mixed chemical streams. Check the iso-corrosion data for your exact concentration, temperature and impurities before you finalise the choice.
When should I choose Alloy 20 over 316L?
Choose Alloy 20 when sulphuric acid, hot acid or chloride cracking is attacking 316L. For mild service, 316L costs less and is often enough.
Should I order seamless or welded Alloy 20 pipe?
Seamless pipe suits pressure duty and critical acid lines. Welded pipe costs less, reaches larger diameters and has a shorter lead time.
Do I need post-weld heat treatment on Alloy 20?
Normally no. Niobium ties up the carbon, so the weld zone resists intergranular attack in the as-welded condition. Your fabrication procedure and design code still govern.
How should I weld Alloy 20 pipe?
Use TIG welding with a matching filler such as ER320LR, a clean joint and low heat input. Keep the joint free of oil, paint and marking ink.
Does Alloy 20 resist chloride stress corrosion cracking?
Yes. The high nickel content gives it much better resistance than the 300-series stainless steels. It is still not immune in every chloride environment, so check the conditions against your design basis.
What tolerances apply to OD and wall?
ASTM B829 sets them for seamless pipe and ASTM B775 for welded pipe. The limits depend on pipe size, and cold-drawn pipe holds tighter limits than hot-finished pipe.
What sizes and schedules can I order?
The tables above cover NPS 1/2 to 12 in Sch 5S, 10S, 40S, 80S and 160. Other sizes and walls can be quoted on request, and popular sizes sit in ready stock, subject to availability.
How do I calculate the weight of an order?
Use Weight (kg/m) = (OD − Wall) × Wall × 0.02538, with OD and wall in mm. Multiply by length and quantity. Real weight varies slightly with wall tolerance.
What affects the price of Alloy 20 Pipes?
Nickel, copper and molybdenum content set the base cost. Size, wall, seamless or welded form, finish, testing, quantity, inspection and freight also count.
Which certificates and tests come with the pipes?
Each order carries an EN 10204 3.1 certificate showing chemistry and mechanical results. A 3.2 certificate and third-party inspection are available on request.
Can you supply matching fittings and flanges?
Yes. Alloy 20 fittings to ASTM B366 and flanges to ASTM B462 can be supplied with the pipe, so the whole line has the same corrosion resistance.
Are you a manufacturer or a supplier of Alloy 20 Pipes?
We are both. We manufacture near Mumbai and supply ready stock of popular sizes from the same location, subject to availability.
Do you export Alloy 20 Pipes, and how are they packed?
Yes. We ship to 85+ countries from our Mumbai export office, and we pack the pipes to suit sea or air freight and your project needs.