Stainless Steel 904L Pipe & Tubes — ASTM A312 TP904L
Certified Supplier of UNS N08904 | DIN 1.4539 | ASME SA312 TP904L Pipes & Tubes across India and Worldwide
What is Stainless Steel 904L Pipe?
Stainless Steel 904L Pipe is a high-alloy, non-stabilised, low-carbon austenitic stainless steel engineered for the most demanding corrosive service environments. Designated under UNS N08904 and DIN 1.4539, this grade contains elevated levels of chromium (19–23%), nickel (23–28%), molybdenum (4–5%), and copper (1–2%), making it one of the most corrosion-resistant stainless steel alloys commercially available. Unlike standard 304 or 316L grades, SS 904L delivers superior resistance to pitting, crevice corrosion, and stress corrosion cracking — especially in chloride-rich and sulphuric acid environments where lesser grades quickly degrade.
At Aashish Metal & Alloys, we are a dedicated manufacturer, stockist, and supplier of Stainless Steel 904L Pipe and Tubes, supplying across India and to international markets. Every pipe and tube we supply is sourced from globally renowned mills — including Sandvik (Sweden), Tubacex (Spain), Sumitomo (Japan), and Jindal (India) — and is backed by full material test certificates (MTC) as per EN 10204 3.1 or 3.2. Whether you need ASTM A312 TP904L seamless pipes for a high-pressure chemical plant, ASME SA312 TP904L welded tubes for heat exchangers, or custom-cut ERW pipes for pharmaceutical infrastructure, Aashish Metal & Alloys delivers exactly what your project requires — on time, at a competitive price, and with complete documentation.
Table of Content
- Stainless Steel 904L Pipe & Tube Specifications
- SS 904L Pipe Chemical Composition (UNS N08904)
- SS 904L Pipe Mechanical Properties (Annealed Condition)
- SS 904L Pipe European & International Standard Equivalents
- Related Types Of Stainless Steel 904L Pipes & Tubes
- Industry Applications of 904L Stainless Steel Pipe
- Why SS 904L Outperforms 316L, 317L, and Standard Grades
- SS 904L Seamless Pipe Standard Dimensions & Weight Chart
- Quality Standards, Certifications & Testing at Aashish Metal & Alloys
- SS 904L Pipe Price List — Indicative FOB Pricing
- Frequently Asked Questions — SS 904L Pipe & Tube
Stainless Steel 904L Pipes & Tubes Specifications
| Specification Parameter | Details |
|---|---|
| Trade / Product Name | Stainless Steel 904L Pipe, SS 904L Tube, UNS N08904 Pipe |
| Grade | SS 904L / UNS N08904 / DIN 1.4539 / AISI 904L |
| ASTM Standard | ASTM A312, ASTM A213, ASTM A249, ASTM A269, ASTM A358, ASTM A409, ASTM A554, ASTM A511 |
| ASME Standard | ASME SA312, ASME SA213, ASME SA249, ASME SA269, ASME SA358 |
| Seamless OD Range | 6.00 mm to 914.4 mm OD (1/8″ NB to 36″ NB) |
| ERW / EFW Pipe Size | 1/2″ NB to 24″ NB (ERW) | 6″ NB to 100″ NB (EFW) |
| LSAW / DSAW Size | 16″ OD to 54″ OD (8 mm to 50 mm wall thickness) |
| Wall Thickness / Schedule | SCH 5S, SCH 10S, SCH 10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS | 0.3 mm to 50 mm |
| Pipe Length | Single Random (SRL): 6 m | Double Random (DRL): 12 m | Fixed / Custom lengths available |
| Pipe End Types | Plain End (PE), Beveled End (BE), Threaded End (TE), Treaded One End (TOE), Beveled Both Ends (BBE) |
| Surface Finish | 2B, No.1, No.4, BA, HL, Mirror Polished, Bright Annealed, Pickled, 8K |
| Form / Shape | Round, Square, Rectangular, Oval, Hex, U-Bend, Coiled, Hydraulic Tubing, Pan Cake Coils |
| Manufacturing Process | Seamless (HFS, CDS), SAW, ERW, EFW, LSAW, HSAW, Fabricated, Extruded, CDW |
SS 904L Pipe Chemical Composition (UNS N08904)
| C % | Mn % | Si % | P % | S % | Cr % | Ni % | Mo % | Cu % |
|---|---|---|---|---|---|---|---|---|
| 0.02 max | 2.00 max | 1.00 max | 0.045 max | 0.035 max | 19.0–23.0 | 23.0–28.0 | 4.0–5.0 | 1.0–2.0 |
SS 904L Pipe Mechanical Properties (Annealed Condition)
| Tensile Strength (MPa) | Yield Strength 0.2% (MPa) | Elongation % (min) | Hardness Rockwell B (max) | Density (g/cm³) | Melting Range | Modulus of Elasticity | Specific Heat (0–100°C) | Thermal Conductivity |
|---|---|---|---|---|---|---|---|---|
| 490 min | 215–220 min | 35 min | 70–90 HRB typical | 7.95–8.0 | 1300–1390 °C | 190 GPa | 450 J/kg·K | 11.5 W/m·K |
SS 904L Pipe European & International Standard Equivalents
| ASTM / ASME | UNS | DIN / EN | BS | JIS | AFNOR (EN) |
|---|---|---|---|---|---|
| A312 / SA312 | N08904 | 1.4539 | 904S13 | SUS 904L | X1NiCrMoCu25-20-5 |
Types of SS 904L Pipe & Tubes We Supply
SS 904L Seamless Pipe
SS 904L Welded Pipe
SS 904L ERW Pipe
SS 904L EFW Pipe
SS 904L Seamless Tubes
SS 904L Welded Tubes
SS 904L ERW Tubes
SS 904L Square Tubes
SS 904L Rectangle Tubes
SS 904L Round Tubes
SS 904L Square Pipe
SS 904L Rectangular Pipe
SS 904L Round Pipe
SS 904L Heat Exchanger Tube
SS 904L Capillary Tubing
SS 904L Electropolished Pipes
Industry Applications of 904L Stainless Steel Pipe
| Industry / Sector | Specific Application |
|---|---|
| Oil & Gas | Sour service pipelines, subsea flowlines, offshore platform piping, production tubing |
| Chemical & Petrochemical | Sulphuric acid transport, phosphoric acid systems, aggressive chemical process piping |
| Seawater Desalination | Evaporator tubing, brine heaters, seawater cooling circuits, RO membrane housings |
| Power Generation | Condenser tubes, heat exchanger bundles, feedwater heaters, boiler superheater tubes |
| Pharmaceutical & Food | Sanitary piping, CIP/SIP lines, sterile fluid transfer, process vessels |
| Pulp & Paper | Bleaching plant piping, chlorine dioxide service, black liquor evaporators |
| Marine & Shipbuilding | Seawater intake/exhaust systems, ballast piping, hull cooling systems |
| Fertilizer & Agrochemical | Urea plant piping, ammonium sulphate service, high-pressure synthesis lines |
| Semiconductor & Electronics | Ultra-pure water lines, acid distribution, high-purity gas piping |
Why SS 904L Outperforms 316L, 317L, and Standard Grades
| Property | SS 904L | SS 316L | SS 317L |
|---|---|---|---|
| Ni Content | 23–28% | 10–14% | 11–15% |
| Mo Content | 4.0–5.0% | 2.0–3.0% | 3.0–4.0% |
| Cu Content | 1.0–2.0% | None | None |
| PREN (Corr. Resistance Index) | ~34–36 | ~25–27 | ~27–29 |
| H2SO4 Resistance | Excellent | Moderate | Moderate |
| Stress Corrosion Cracking Resistance | Superior | Good | Good |
| Pitting Resistance in Chlorides | Excellent | Good | Very Good |
| Cost | Premium | Moderate | Moderate-High |
SS 904L Seamless Pipe Standard Dimensions & Weight Chart
| NB (mm) | OD (mm) | SCH 10SWT (mm) | SCH 40WT (mm) | SCH 80WT (mm) | SCH 10SKg/m | SCH 40Kg/m | SCH 80Kg/m | SCH 160WT (mm) |
|---|---|---|---|---|---|---|---|---|
| 15 | 21.3 | 2.11 | 2.77 | 3.73 | 1.00 | 1.27 | 1.62 | 4.78 |
| 20 | 26.7 | 2.11 | 2.87 | 3.91 | 1.28 | 1.68 | 2.20 | 5.56 |
| 25 | 33.4 | 2.77 | 3.38 | 4.55 | 2.09 | 2.50 | 3.24 | 6.35 |
| 40 | 48.3 | 2.77 | 3.68 | 5.08 | 3.11 | 4.05 | 5.41 | 7.14 |
| 50 | 60.3 | 2.77 | 3.91 | 5.54 | 3.93 | 5.44 | 7.48 | 8.74 |
| 80 | 88.9 | 3.05 | 5.49 | 7.62 | 6.45 | 11.30 | 15.20 | 11.13 |
| 100 | 114.3 | 3.05 | 6.02 | 8.56 | 8.36 | 16.07 | 22.30 | 13.49 |
| 150 | 168.3 | 3.40 | 7.11 | 10.97 | 13.86 | 28.26 | 42.56 | 18.26 |
| 200 | 219.1 | 3.76 | 8.18 | 12.70 | 19.96 | 42.55 | 64.60 | 22.23 |
Note: Weight in Kg/m calculated for SS 904L density of 7.95 g/cm³. Custom wall thickness and lengths available on request.
Quality Standards, Certifications & Testing at Aashish Metal & Alloys
Quality Certifications We Hold
- ISO 9001:2015 — Quality Management System
- PED 97/23/EC — European Pressure Equipment Directive
- IBR (Indian Boiler Regulations) Approval
- NACE MR0175 — Sour Service Compliance
- EN 10204 3.1 / 3.2 Material Test Certificates (MTC)
- ISO 14001:2015 — Environmental Management
Testing Performed on Every Lot
| Mechanical Tests | Non-Destructive Tests (NDT) | Chemical & Special Tests |
|---|---|---|
| Tensile Strength TestYield Strength TestElongation TestHardness (Rockwell/Brinell)Charpy V-Notch Impact TestBend / Flattening Test | Ultrasonic Testing (UT)Eddy Current Test (ECT)Radiographic Testing (RT)Dye Penetrant Test (DP)Magnetic Particle Inspection (MPI)Hydrostatic Pressure Test | PMI (Positive Material Identification)Intergranular Corrosion Test (IGC)SSC — Sulphide Stress CrackingSalt Spray TestMicro / Macro AnalysisFerrite Content Measurement |
SS 904L Pipe Price List — Indicative FOB Pricing
| Product Description | FOB Price (USD) | Unit |
|---|---|---|
| ASTM A312 TP904L / ASME SA312 TP904L Seamless Pipe | $1,000 – $2,000 | Per Ton |
| SS 904L Welded Pipe (14mm) | $1,000 – $2,500 | Per Ton |
| SCH 80 904L Seamless Pipe | $2,550 | Per Ton |
| 2B Finish 904L Tube | $1.65 – $2.11 | Per Kg |
| Micro 904L Capillary Tube (in coils) | $4.00 – $6.50 | Per Kg |
| 904L Square / Rectangular Tube | $900 – $2,000 | Per Ton |
| UNS N08904 Round Pipe | $1.65 – $2.11 | Per Kg |
| ASME B36.19 Welded 904L Pipe | $1.10 – $2.80 | Per Kg |
* Prices are indicative. Actual prices vary based on size, schedule, quantity, delivery location, and market conditions. Contact us for the latest 904L pipe price list in India and export pricing.
For More Information About Stainless Steel 904L Pipes & Tubes please call +91-22-66362223 / 66394926 or send an email to export@aashishmetal.com
Frequently Asked Questions — SS 904L Pipe & Tube
SS 904L contains significantly higher levels of nickel (23–28% vs. 10–14%), molybdenum (4–5% vs. 2–3%), and additionally contains 1–2% copper, which SS 316L does not. These differences give 904L a far superior resistance to pitting, crevice corrosion, sulphuric acid attack, and stress corrosion cracking. Its Pitting Resistance Equivalent Number (PREN) is approximately 34–36 versus 25–27 for 316L. 904L is specified when 316L or 317L have already failed in service.
The primary standards are ASTM A312 TP904L (seamless and straight-seam welded austenitic pipe), ASME SA312 TP904L (for pressure vessel applications), ASTM A213 TP904L (seamless tubes for boilers and heat exchangers), and ASTM A269 TP904L (seamless and welded austenitic stainless steel tubing). European equivalents fall under EN 10216-5 (seamless precision tube) and EN 10217-7 (welded tube).
No. SS 904L is a fully austenitic stainless steel and is non-magnetic in all conditions, including after cold working. This makes it suitable for applications where magnetic interference is a concern, such as MRI-adjacent infrastructure or sensitive instrumentation environments.
SS 904L is generally recommended for continuous service up to approximately 400°C (750°F). Above this range, sensitisation and sigma-phase precipitation can reduce corrosion resistance. For cryogenic applications, 904L performs well down to -196°C due to its austenitic structure and high nickel content.
Yes. SS 904L can be welded using all conventional methods including TIG (GTAW), MIG (GMAW), SMAW (stick), SAW, and FCAW. No pre-heating or post-weld heat treatment is required. However, it is important to use matching-composition filler metals (e.g., ER 385 / AWS A5.9) to maintain corrosion resistance in the weld zone.
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