Stainless Steel 904L Pipes Manufacturer in India
SS 904L Pipe is a stainless steel alloy which is used in corrosive applications – like sulfuric acid lines, seawater services, chlorine containing process fluids and applications where the 316L & 317L grades have failed before. SS 904L Pipe is available in seamless, ERW welded, and EFW (Electric Fusion Welded) types, in sizes from 1/2" NB to 100" NB, in schedules from SCH 5 to XXS.
Metinox Overseas produces and supplies SS 904L pipes for chemical industries, refineries, desalination plants and Offshore Projects all around the globe. The materials supplied by Metinox are in accordance with standards such as ASTM A312, ASTM A213, ASME SB677, and all materials are supplied with full Mill Test Certificate, third party inspection report, and complete heat traceability.
Table of content
- What Is Stainless Steel 904L Pipe?
- Types of 904L Stainless Steel Pipe
- SS 904L Pipe Specifications
- Chemical Composition of SS 904L
- Mechanical Properties of SS 904L Pipe
- Physical Properties of SS 904L Pipe
- SS 904L Equivalent Grades
- Stainless Steel 904L Pipe Schedule List
- Applications & Industry Use Cases – SS 904L Pipes
- Why Choose Metinox Overseas for SS 904L Pipes?
- Stainless Steel 904L Pipes Price
- Frequently Asked Questions (FAQs) – SS 904L Pipes
What Is Stainless Steel 904L Pipe?
SS 904L is a stainless steel pipe grade built for one job - handling acids, seawater, and chloride-heavy fluids that corrode standard grades within months.
It’s used in chemical plants, refineries, desalination plants, and offshore platforms where ss 304 or 316L simply don’t last. The grade gets its corrosion resistance from higher nickel (23–28%), molybdenum (4–5%), and a small addition of copper (1–2%). Carbon is kept extremely low at 0.02% so weld joints don’t lose their corrosion resistance during fabrication.
Why Engineers Specify SS 904L Pipe?
- Sulfuric acid lines - handles a wide concentration range, not just dilute solutions
- High-chloride environments - resists pitting and crevice corrosion where 316L starts failing
- Stress corrosion cracking - not the concern it is with lower-nickel grades
- Welded assemblies - weld joints hold the same resistance as the parent pipe
Types of 904L Stainless Steel Pipe
Metinox Overseas maintains one of the widest product ranges in the 904L category.
| Type | How It’s Made | Where It’s Used |
| SS 904L Seamless Pipe | Extruded without weld seam; consistent microstructure throughout wall | High-pressure, high-temperature service; critical applications |
| SS 904L Welded Pipe | Electric Resistance Welded; cost-effective for medium pressures | General process piping; utility systems |
| SS 904L EFW Pipe | Electric Fusion Welded; suitable up to 8" OD (ASTM A358) | Large-diameter, higher-pressure service |
SS 904L Pipe Specifications –
| Parameter | Details |
| Specifications | ASTM B673, B677 / ASME SB673, SB 677 |
| Dimensions | ASTM, ASME and API |
| Size Range | 1/8″ NB to 30″ NB |
| Outside Diameter | 6.00 mm OD up to 914.4 mm OD; up to 24″ NB ex-stock |
| Wall Thickness Range | 0.3 mm – 50 mm (SCH 5 to SCH XXS) |
| Specialisation | Large Diameter Size; Custom Dimensions Available |
| Schedule | SCH 20, SCH 30, SCH 40, STD, SCH 80, XS, SCH 60, SCH 120, SCH 140, SCH 160, XXS |
| Type | Seamless / ERW / Welded |
| Form | Round, Square, Rectangular, Hydraulic, Coiled Tubes, U-Shape |
| Length | Single Random, Double Random & Cut Length |
| Pipe End | Plain End (PE), Beveled End (BE), Threaded End |
Custom sizes, special wall thicknesses, and non-standard schedules are available on request. Contact Metinox Overseas for tailored solutions.
Chemical Composition of SS 904L
SS 904L is a high-alloy austenitic stainless steel. Its precisely controlled elemental balance gives it superior corrosion resistance compared to standard grades like ss 316L or 317L.
| Grade | C | Cr | Cu | Mn | Mo | Ni | P | S |
| SS 904l | 0.02 | 19.0–23.0 | 1.0–2.0 | 2.00 max | 4.0–5.0 | 23.0–28.0 | 0.045 | 0.035 |
Mechanical Properties of SS 904L Pipe
All mechanical property values below are for annealed condition as per ASTM B673 / ASTM B677 specifications.
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness – Rockwell B (HR B) | Hardness – Brinell (HB) |
| 904L | 490 | 220 | 36 | 70–90 typical | 150 |
Physical Properties of SS 904L Pipe
| Grade | Density (kg/m³) | Elastic Modulus (GPa) | Thermal Expansion 0–100°C (µm/m·°C) | Thermal Expansion 0–315°C (µm/m·°C) | Thermal Expansion 0–538°C (µm/m·°C) | Thermal Conductivity at 20°C (W/m.K) | Thermal Conductivity at 500°C (W/m.K) | Specific Heat 0–100°C (J/kg.K) | Electrical Resistivity (nΩ.m) |
| 904L | 7,900 | 190 | 15 | – | – | 11.5 | – | 500 | 952 |
SS 904L Equivalent Grades
When sourcing or specifying 904L across different markets and standards bodies, the following equivalent designations apply. All refer to the same alloy composition:
| Standard | UNS | Werkstoff | AFNOR | EN | JIS | BS | KS |
| SS 904L | N08904 | 1.4539 | Z2 NCDU 25-20 | X1NiCrMoCu25-20-5 | SUS 904L | 904S13 | STS 317J5L |
Stainless Steel 904L Pipe Schedule List
| Nominal Size (IPS) | Outside Diameter (inches) | Available Schedules |
| 1/8" | 0.405" | SCH 40, 80 |
| 1/4" | 0.540" | SCH 10, 40, 80 |
| 3/8" | 0.675" | SCH 10, 40, 80 |
| 1/2" | 0.840" | SCH 5, 10, 40, 80, 160, XXH |
| 3/4" | 1.050" | SCH 10, 40, 80, 160, XXH |
| 1" | 1.315" | SCH 5, 10, 40, 80, 160, XXH |
| 1-1/4" | 1.660" | SCH 10, 40, 80, 160, XXH |
| 1-1/2" | 1.900" | SCH 10, 40, 80, 160, XXH |
| 2" | 2.375" | SCH 10, 40, 80, 160, XXH |
| 2-1/2" | 2.875" | SCH 10, 40, 80, 160, XXH |
| 3" | 3.500" | SCH 5, 10, 40, 80, 160, XXH |
| 3-1/2" | 4.000" | SCH 10, 40, 80, 160, XXH |
| 4" | 4.500" | SCH 10, 40, 80, 160, XXH |
| 5" | 5.563" | SCH 10, 40, 80, 160, XXH |
| 6" | 6.625" | SCH 5, 10, 40, 80, 120, 160, XXH |
| 8" | 8.625" | SCH 5, 10, 40, 80, 120, 160, XXH |
| 10" | 10.750" | SCH 10, 20, 40, 80 (.500), TRUE 80 (.500) |
| 12" | 12.750" | SCH 10, 20, 40 (.375), TRUE 40 (.406), SCH 80 (.500) |
| 14" | 14.000" | SCH 10 (.188), SCH 40 (.375) |
| 16" | 16.000" | SCH 10 (.188), SCH 40 (.375) |
| 18" | 18.000" | SCH 40 (.375) |
Applications & Industry Use Cases – SS 904L Pipes
| Industry | Specific Applications |
| Chemical Processing | Sulfuric acid piping (H₂SO₄ at all concentrations), phosphoric acid lines, acetic acid systems, chemical reactors, scrubbers |
| Oil & Gas | Sour gas gathering lines, offshore risers, subsea flowlines, gas injection systems, wellhead equipment |
| Petrochemical | Refinery process lines, crude oil desulfurisation units, heat exchanger tubes, column internals |
| Desalination & Seawater | Reverse osmosis (RO) system pipework, brine handling, seawater intake lines, evaporator tubes |
| Pharmaceuticals | Process piping (high-purity), WFI (Water For Injection) loops, CIP/SIP systems, sterile fluid transfer |
| Power Generation | Feedwater heater tubes, condenser tubes, flue gas desulfurisation (FGD) systems, nuclear support structures |
| Pulp & Paper | Bleaching plant piping, digester lines, black liquor handling, chlorine dioxide systems |
| Food & Dairy | High-purity process lines, CIP system piping, hygienic fittings, stainless tanks |
| Aerospace | Hydraulic and pneumatic tubing, fuel system lines, high-pressure structural tubing |
| Fertiliser Plants | Urea synthesis piping, ammonia lines, phosphoric acid systems |
| Marine | Seawater cooling systems, ballast water treatment, offshore structural tubing |
| Refining | Hydrocracker lines, hydrotreater piping, amine gas treating systems |
Why Choose Metinox Overseas for SS 904L Pipes?
Metinox Overseas is a combination of verified technical capability, transparent sourcing and a commitment to delivering exactly what the purchase order specifies not a compromise.
Our Product Quality Standards:
| Quality Parameter | Metinox Overseas Commitment |
| Mill Source Certification | Only from ISO 9001:2015 certified mills with full chemical & mechanical traceability |
| Incoming Inspection | 100% dimensional check + PMI verification on every heat received |
| Surface Finish | Annealed & Pickled (AP) as standard; Bright Annealed (BA) and polished available |
| Test Certificates | EN 10204 3.1 MTC as standard; 3.2 with TPI available on all orders |
| NDT Capabilities | Hydrostatic test, eddy current test, UT, RT (radiography) at certified labs |
| Traceability | Full heat-number traceability from mill to delivery |
Stainless Steel 904L Pipes Price
904L costs more than standard grades — nickel and molybdenum are expensive and this grade carries a lot of both. When market prices for these metals rise, pipe prices follow.
What you actually pay depends on whether you need seamless or welded, the wall thickness, how much you’re ordering, and where the material is sourced from. Indian mill is more affordable than European.
Factors that affect your final 904L pipe price:
- Quantity: Larger orders attract better per-unit pricing; trial quantities are also accommodated
- Grade / Form: Seamless costs more than welded for the same OD and wall
- Schedule / Wall Thickness: Heavy-wall pipes cost more per metre but not necessarily more per kg
- Finish: Bright Annealed (BA) carries a premium over standard Annealed & Pickled (AP)
- Certifications: EN 10204 3.2 with third-party inspection adds cost vs. 3.1
- Origin: European or Japanese mill material commands a higher price than Indian mill
- Lead Time: Ex-stock items are priced differently from made-to-order
Request an exact price quote - our team responds within 24 hours with a detailed commercial offer including lead time, packing, and freight options.
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Frequently Asked Questions (FAQs) – SS 904L Pipes
The key variations can be seen in terms of the alloy composition and resistance to corrosion. In SS 904L, the level of molybdenum is 4-5%, and that of nickel is 23-28%. However, in 316L, the level of molybdenum is 2-3%, and that of nickel is 10-14%. As a result, 904L has much greater PREN of 32-36 compared to 316L
Yes - SS 904L is a premium alloy and carries a higher price per tonne than standard grades such as 304 or 316L. Indicative prices for SS 904L seamless pipes range from USD 5,200 to USD 7,500 per metric tonne (ex-works India), depending on size, schedule, finish, and quantity.
The number under the UNS classification for 904L stainless steel is N08904, while the European Werkstoff number is 1.4539.
Yes. One of 904L's key design advantages is its excellent weldability. The ultra-low carbon content (≤ 0.02%) virtually eliminates the risk of sensitisation (intergranular carbide precipitation) during welding.
SS 904L seamless pipes are available in sizes from 1/2" NB to 16" NB, covering schedules from SCH 5 to SCH XXS. Welded 904L ERW pipes range from 1/2" NB to 24" NB, and EFW pipes from 6" NB to 100" NB. Custom sizes, non-standard wall thicknesses, and special lengths are available on request from Metinox Overseas.
Make sure you ask for a Mill Test Certificate (MTC) with complete chemical and mechanical specifications, along with a PMI test report that verifies the alloy. Metinox Overseas offers EN 10204 3.1 MTC on standard basis, while 3.2 TPI is also available.
Yes. Metinox Overseas is an active exporter of stainless steel 904L pipes to more than 80 countries including the UAE, Saudi Arabia, Qatar, Oman, the United Kingdom, Germany, Italy, the USA, Canada, Singapore, Malaysia, Australia, South Africa, and across Southeast Asia and Africa.
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