Stainless Steel 904L Seamless Pipe Supplier in India
Most stainless steel pipes have a weld seam. SS 904L Seamless Pipe is built without one, making it the specification engineers trust when the application demands zero tolerance for pipe failure.
It is manufactured by piercing a solid steel billet and shaping it into a pipe - no welding involved at any stage. The result is a pipe wall with identical microstructure, corrosion resistance, and mechanical strength at every point. No heat-affected zone. No hidden weak point. No seam to fail under pressure.
Metinox Overseas supplies ASTM A312 TP904L Seamless Pipes to chemical plants, refineries, desalination units, pharmaceutical facilities, and offshore installations worldwide.
Table of content
- What Is SS 904L Seamless Pipe?
- Types of SS 904L Seamless Pipe
- ASTM A312 TP904L Seamless Pipe Specifications
- Chemical Composition of SS 904L Seamless Pipe
- Mechanical Properties of SS 904L Seamless Pipe
- Physical Properties of SS 904L Seamless Pipe
- SS 904L Seamless Pipe Equivalent Grades
- SS 904L Seamless Pipe Schedule & Wall Thickness
- SS 904L Seamless Pipe Applications
- Why Choose Metinox Overseas for SS 904L Seamless Pipes?
- SS 904L Seamless Pipe (FAQs)
What Is SS 904L Seamless Pipe?
Stainless Steel 904L Seamless Pipes are alloy steel pipes that are not welded but are made using the technique of piercing and extrusion of steel billets as a whole. They are very durable and have no weak spots, thus, are suitable for highly aggressive and high pressure applications.
The steel has a composition of chromium (19-23%), nickel (23-28%), molybdenum (4-5%), and copper (1-2%), providing excellent corrosion resistance to sulfuric acid, salt water and chloride containing liquids media that quickly damage pipes of SS 316 and other standard grades.
SS 904L Seamless Pipes have 0.020% of maximum carbon content and PREN of 32-36 [calculated as Cr + 3.3Mo + 16N, per ISO 21457]. They are very popular for application in chemical industry, oil and gas, desalination plants and pharmaceutical processes.
Types of SS 904L Seamless Pipe
Metinox Overseas stocks SS 904L pipes across three manufacturing forms to cover the full range of pressure, diameter, and application requirements.
| Type | Size (OD) | Wall Thickness | Length |
| SS 904L Pipe | 6.00 mm – 914.4 mm | 0.3 mm – 50 mm | Single Random, Double Random & Cut Length |
| SS 904L Welded Pipe | 5.0 mm – 1,219.2 mm | 0.5 mm – 20 mm | Single Random, Double Random & Cut Length |
| SS 904L ERW Pipe | 1/8″ NB – 30″ NB | 0.5 mm – 20 mm | Single Random, Double Random & Cut Length |
ASTM A312 TP904L Seamless Pipe Specifications
| Parameter | Details |
| International Specifications | ASTM A312 / ASME SA312, ASTM B677 / ASME SB677, ASTM A213 / ASME SA213, EN 10216-5 |
| Standard | ASTM, ASME, AISI, EN, DIN, JIS |
| Seamless Pipe Size (NB) | 1/2" NB to 16" NB (up to 24" NB available ex-stock) |
| Outside Diameter (OD) | 4.00 mm OD to 219.00 mm OD (custom OD available) |
| Wall Thickness Range | 0.5 mm – 20 mm |
| Schedule | SCH 5, SCH 10, SCH 20, SCH 40, STD, SCH 80, XS, SCH 120, SCH 160, XXS |
| Type | Seamless (Hot Finished / Cold Drawn) |
| Form | Round, Square, Rectangular |
| Length | Single Random, Double Random & Required Cut Length |
| Pipe End | Plain End (PE), Beveled End (BE), Threaded End (TE) |
| Delivery Condition | Annealed & Pickled (AP), Bright Annealed (BA), Cold Drawn (CD), Hot Finished (HF) |
| Surface Finish | 2B, No.1, No.4, No.8 Mirror Finish; custom finishes available |
| Dimensional Standard | ANSI/ASME B36.10M, B36.19M |
| Marking | Specification, Grade, Size, Schedule, Method of Manufacture, Heat Number |
| Test Certificates | EN 10204 3.1 MTC standard; EN 10204 3.2 with TPI on request |
| NDT | Hydrostatic test, Eddy Current, Ultrasonic Testing (UT), Radiography (RT) |
| Packing | PE fabric bundles, ply wooden boxes, steel strip bundled; standard seaworthy export packing |
Chemical Composition of SS 904L Seamless Pipe
| Grade | C (%) | Mn (%) | Si (%) | P (%) | S (%) | Cr (%) | Mo (%) | Ni (%) | Cu (%) |
| SS 904L | 0.020 max | 2.00 max | 1.00 max | 0.040 max | 0.030 max | 19.00–23.00 | 4.00–5.00 | 23.00–28.00 | 1.00–2.00 |
Mechanical Properties of SS 904L Seamless Pipe
| Grade | Tensile Strength (min) | Yield Strength (0.2% Offset) (min) | Elongation (min) |
| SS 904L | 71,000 psi (490 MPa) | 32,000 psi (220 MPa) | 35% |
Physical Properties of SS 904L Seamless Pipe
| Property | Value (Metric) |
| Density | 7,950 kg/m³ |
| Melting Range | 1,300–1,390°C |
| Elastic Modulus | 190 GPa |
| Thermal Conductivity at 20°C | 11.5 W/m·K |
| Thermal Conductivity at 100°C | 12.9 W/m·K |
| Thermal Expansion (20–100°C) | 15.0 µm/m·°C |
| Specific Heat (0–100°C) | 450–500 J/kg·K |
| Electrical Resistivity | 952 nΩ·m |
SS 904L Seamless Pipe Equivalent Grades
| Standard | UNS | Werkstoff Nr. | AFNOR | EN Designation | JIS | BS | KS |
| SS 904L | N08904 | 1.4539 | Z2 NCDU 25-20 | X1NiCrMoCu25-20-5 | SUS 904L | 904S13 | STS 317J5L |
SS 904L Seamless Pipe Schedule & Wall Thickness
All dimensions are for seamless pipe per ASME B36.19M / ASME B36.10M. Wall thickness values are in inches.
| Nominal (NPS) | OD (in) | SCH 5S | SCH 10S | SCH 40S (Std) | SCH 80S (XH) | SCH 160 |
| 1/8" | 0.405 | – | 0.049 | 0.068 | 0.095 | – |
| 1/4" | 0.540 | – | 0.065 | 0.088 | 0.119 | – |
| 3/8" | 0.675 | – | 0.065 | 0.091 | 0.126 | – |
| 1/2" | 0.840 | 0.065 | 0.083 | 0.109 | 0.147 | 0.187 |
| 3/4" | 1.050 | 0.065 | 0.083 | 0.113 | 0.154 | 0.218 |
| 1" | 1.315 | 0.065 | 0.109 | 0.133 | 0.179 | 0.250 |
| 1-1/4" | 1.660 | 0.065 | 0.109 | 0.140 | 0.191 | 0.250 |
| 1-1/2" | 1.900 | 0.065 | 0.109 | 0.145 | 0.200 | 0.281 |
| 2" | 2.375 | 0.065 | 0.109 | 0.154 | 0.218 | 0.343 |
| 2-1/2" | 2.875 | 0.083 | 0.120 | 0.203 | 0.276 | 0.375 |
| 3" | 3.500 | 0.083 | 0.120 | 0.216 | 0.300 | 0.437 |
| 3-1/2" | 4.000 | – | 0.120 | 0.226 | 0.318 | – |
| 4" | 4.500 | 0.083 | 0.120 | 0.237 | 0.337 | 0.531 |
| 5" | 5.563 | 0.109 | 0.134 | 0.258 | 0.375 | 0.625 |
| 6" | 6.625 | 0.109 | 0.134 | 0.280 | 0.432 | 0.718 |
| 8" | 8.625 | 0.109 | 0.148 | 0.322 | 0.500 | 0.906 |
| 10" | 10.750 | 0.134 | 0.165 | 0.365 | 0.500 | 1.125 |
| 12" | 12.750 | 0.156 | 0.180 | 0.375 | 0.500 | 1.312 |
| 14" | 14.000 | 0.156 | 0.188 | 0.375 | 0.500 | 1.406 |
Note: Sizes above 16" NB in seamless are available on inquiry. Heavier wall schedules (XXS) are available in smaller sizes. Contact Metinox Overseas for a complete seamless pipe dimensions chart.
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SS 904L Seamless Pipe Applications
| Industry | Applications |
| Chemical Processing | Sulfuric acid piping (H₂SO₄ at all concentrations), phosphoric acid lines, acetic acid systems, scrubbers, chemical reactors |
| Oil & Gas | Sour gas gathering lines, offshore risers, subsea flowlines, gas injection systems, wellhead equipment, NACE MR0175 service |
| 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 | High-purity process piping, 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 |
| Aerospace | Hydraulic and pneumatic tubing, fuel system lines, high-pressure structural tubing |
Why Choose Metinox Overseas for SS 904L Seamless 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 904L seamless pipe stock is drawn from ISO 9001:2015 certified mills.
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 |
| Manufacturing Method Verification | Each seamless pipe lot confirmed as hot-finished or cold-drawn; method marked on pipe |
| Surface Finish | Annealed & Pickled (AP) as standard; Bright Annealed (BA) and polished available |
| Certificates | EN 10204 3.1 MTC as standard; 3.2 with TPI available on all orders |
SS 904L Seamless Pipe (FAQs) –
The key difference is the manufacturing method and the resulting microstructure. A seamless pipe is extruded from a solid billet without any weld seam, giving it a homogeneous wall cross-section that is uniform in mechanical and corrosion-resistant properties throughout. A welded pipe (ERW or EFW) has a longitudinal weld seam that is a potential point of weakness under cyclic stress or in highly corrosive service.
SS 904L seamless pipes are stocked and available from 1/2" NB to 16" NB, in schedules SCH 5 to SCH XXS, with outside diameters from 4 mm to 219 mm. Sizes up to 24" NB are available ex-stock. Custom sizes, non-standard wall thicknesses, and special lengths are available on request.
The UNS designation for 904L stainless steel is N08904. The European Werkstoff number is 1.4539, the EN designation is X1NiCrMoCu25-20-5, and the JIS equivalent is SUS 904L.
Yes. The ultra-low carbon content (≤ 0.020%) of 904L is specifically designed to prevent sensitisation (intergranular carbide precipitation) in the heat-affected zone during welding. No preheat is required.
The indicative price of SS 904L seamless pipe ex-works India ranges from USD 5,200 to USD 8,500 per metric tonne (equivalent to approximately USD 5.20–8.50 per kg), depending on size, schedule, finish (AP vs BA), manufacturing route (hot finished vs cold drawn), and quantity. Nickel and molybdenum market prices directly affect the final price.
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