Silver Tubes operates as a dedicated Stainless Steel 904L Seamless Pipes manufacturer, supplier, and exporter serving industries that demand high corrosion resistance and pressure integrity. Chemical processing, oil refineries, gas transportation, hydrocarbon handling, hydraulic cylinders, automotive assemblies, and boiler fabrication all draw from our 904L inventory regularly. All pipes are shipped from our facility in client specified grades, finishes, wall thicknesses, lengths, and dimensional configurations. As one of the most reliable 904L SS seamless pipe manufacturers in India, Silver Tubes maintains tight tolerances across each production run. Our SS 904L seamless pipe suppliers network has good repeatability of lead times for domestic and export markets. Contact Silver Tubes today for pricing, grade specifications and dimensions on hand.
Chemical plants, oil refineries, and hydrocarbon processing units need piping that survives acidic, chloride-heavy conditions without early failure. SS 904L Seamless Pipes deliver exactly that. Among 904L SS seamless pipe manufacturers, Silver Tubes supplies, exports and manufactures these pipes across a range of materials, grades and finishes, with custom thickness, length and shape available on request. Gas transportation lines, hydraulic cylinders, bearings, automobiles, and boilers all depend on this grade to hold up under demanding operating conditions.
Stainless Steel 904L Seamless Pipes belong to a super-austenitic grade built around high nickel and molybdenum content, with copper added on top. That combination pushes resistance to reducing acids, crevice corrosion, and stress corrosion cracking well beyond standard austenitic grades. Wherever sulfuric acid or chloride-bearing media touch the piping system, refineries and chemical processing lines specify this grade first.
As an SS 904L seamless pipe supplier, Silver Tubes stocks these pipes in outside diameters and wall thicknesses built for hydrocarbon transport and boiler systems. Before placing a bulk order, buyers can check current rates on the Stainless Steel Pipe Price List and specify custom lengths or finishes to match project drawings.
As a Stainless Steel Pipes Manufacturer, Silver Tubes runs a controlled sequence of heating, piercing and sizing that turns raw billets into finished seamless pipes.
The 904L grade has low carbon content that minimizes carbide precipitation during welding and fabrication and preserves corrosion resistance along heat affected zones. Copper takes the major role in reducing the effects of acidic environments, such as sulfuric acid service, while the addition of nickel and molybdenum adds to the resistance to chloride attack and stress corrosion cracking.
Oxidation resistance holds up well in continuous service. Structural stability drops once temperatures pass 400 oC, though, which is why this grade suits acid and chloride duty rather than high-heat structural work. Low sulfur content keeps the steel easy to fabricate, weld, and shape into custom dimensions without excessive tool wear.
Each batch of SS 904L Seamless Pipes passes dimensional test, hydrostatic test and material test before shipping, to meet the ordered specifications. Each shipment is then accompanied by laboratory test certificates confirming chemical composition and mechanical properties to ASTM and ASME reference standards.
Every export order is accompanied by a mill test report and by third-party inspection records, which remain on file for the buyers, providing complete traceability. Before shipment, buyers can request certification packages to comply with project documentation and customs.
| Specifications | ASTM B677/ ASME SA312 |
| Seamless Pipes | 1 / 2" NB - 16" NB |
| Outside Diameter | 6.00 mm OD up to 914.4 mm OD, Sizes up to 24" NB available Ex-stock, OD Size Steel Tubes available Ex-stock |
| Thickness Range | 0.3mm – 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
| Type | Seamless |
| Form | Round Pipes, Square Pipes, Rectangular Pipes |
| Length | Single Random, Double Random & Required Length |
| End | Plain End, Beveled End, Treaded |
| Outside Finish | 2B, No.4, No.1, No.8 Mirror Finish for Stainless Steel Pipes, Finish as per customer Requirements |
| Delivery Condition | Annealed and Pickled, Polished, Bright Annealed, Cold Drawn |
| EN 10216-5 | EN 10216 904L Seamless Steel Pipe, EN 10216-5 1.4539 Seamless Steel Pipes for pressure purposes |
| EN 10217-7 | EN 10217 904L Welded Steel Pipe, Steel EN 10217-7 1.4539 Welded Pipes for pressure purposes |
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | EN | JIS | BS | KS |
| SS 904L | N08904 | 1.4539 | Z2 NCDU 25-20 | X1NiCrMoCu25-20-5 | SUS 904L | 904S13 | STS 317J5L |
| 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 max | 23.00 – 28.00 | 1.00 – 2.00 |
| Grade | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| SS 904L | Psi – 71000, MPa – 490 | Psi – 32000, MPa – 220 | 35 % |
| Specific Heat (0-100°C) | 450 | J.kg-1.°K-1 |
| Thermal Conductivity | 11.5 | W.m-1.°K-1 |
| Thermal Expansion | 15.8 | mm/m/°C |
| Modulus Elasticity | 190 | GPa |
| Electrical Resistivity | 9.52 | μohm/cm |
| Density | 7.95 | g/cm3 |
| Nominal size [inches] | Outside diameter (OD) [inches] | Outside diameter (OD) [mm] | Wall thickness [inches] | Wall thickness [mm] | Weight [lb/ft] | Weight [kg/m] |
| 1/8" NPS 6 | 0.41 | 10.3 | 0.068 | 1.73 | 0.24 | 0.37 |
| 1/4" NPS 8 | 0.54 | 13.7 | 0.088 | 2.24 | 0.42 | 0.63 |
| 3/8" NPS 10 | 0.68 | 17.1 | 0.091 | 2.31 | 0.57 | 0.84 |
| 1/2" NPS 15 | 0.84 | 21.3 | 0.109 | 2.77 | 0.85 | 1.27 |
| 3/4" NPS 20 | 1.05 | 26.7 | 0.113 | 2.87 | 1.13 | 1.69 |
| 1" NPS 25 | 1.32 | 33.4 | 0.133 | 3.38 | 1.68 | 2.5 |
| 1 1/4" NPS 32 | 1.66 | 42.2 | 0.14 | 3.56 | 2.27 | 3.39 |
| 1 1/2" NPS 40 | 1.9 | 48.3 | 0.145 | 3.68 | 2.72 | 4.05 |
| 2" NPS 50 | 2.375 | 60.3 | 0.154 | 3.91 | 3.65 | 5.44 |
| 2 1/2" NPS 65 | 2.875 | 73.0 | 0.203 | 5.16 | 5.79 | 8.63 |
| 3" NPS 80 | 3.5 | 88.9 | 0.216 | 5.49 | 7.58 | 11.29 |
| 3 1/2" NPS 90 | 4.0 | 101.6 | 0.226 | 5.74 | 9.11 | 13.57 |
| 4" NPS 100 | 4.5 | 114.3 | 0.237 | 6.02 | 10.79 | 16.07 |
| 5" NPS 125 | 5.563 | 141.3 | 0.258 | 6.55 | 14.62 | 21.77 |
| 6" NPS 150 | 6.625 | 168.3 | 0.28 | 7.11 | 18.97 | 28.26 |
| 8" NPS 200 | 8.625 | 219.1 | 0.322 | 8.18 | 28.55 | 42.55 |
| 10" NPS 250 | 10.75 | 273.0 | 0.365 | 9.27 | 40.48 | 60.31 |
| 12" NPS 300 | 12.75 | 323.8 | 0.406 | 10.31 | 53.52 | 79.73 |
| 14" NPS 350 | 14.0 | 355.6 | 0.437 | 11.13 | 54.57 | 94.55 |
| 16" NPS 400 | 16.0 | 406.4 | 0.5 | 12.7 | 82.77 | 123.3 |
| 18" NPS 450 | 18.0 | 457.0 | 0.562 | 14.27 | 104.67 | 155.8 |
| 20" NPS 500 | 20.0 | 508.0 | 0.594 | 15.09 | 123.11 | 183.42 |
| 24" NPS 600 | 24.0 | 610.0 | 0.688 | 17.48 | 171.29 | 255.41 |
| 32" NPS 800 | 32.0 | 813.0 | 0.688 | 17.48 | 230.08 | 342.91 |
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SS 904L seamless pipes are super-austenitic stainless pipes made from UNS N08904 grade, built around high nickel, molybdenum, and copper content for acid and chloride resistance, with no weld seam running through them.
Silver Tubes builds these pipes to ASTM B677 and ASME SA312 specifications. EN 10216-5 and EN 10217-7 add coverage for pressure-purpose seamless and welded variants.
Moderately elevated temperatures pose no problem for SS 904L, but structural stability falls off above 400 degree C, making the grade a better fit for acid and chloride service than high-heat structural duty.
Yes. Every shipment ships with laboratory test certificates verifying chemical composition and mechanical properties. Mill test reports are available on request for export documentation.
Silver Tubes holds ISO 9001:2015 certification and supplies SS 904L seamless pipes from 1/2 inch NB to 16 inch NB, backed by laboratory test certificates on every export order.
AN ISO 9001:2015 CERTIFIED
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