Adarsh Stainless supplies Stainless Steel 904L Buttweld Fittings to fabricators and EPC contractors handling sulfuric acid, phosphoric acid, and chloride-bearing process lines. These fittings are available in different types, such as elbows, tees, reducers, caps, and stub ends, that are designed as per ASTM A403 and ASME SA403 in seamless and welded form from 1/2 inch through 48 inches. Molybdenum runs 4% to 5%, chromium 19% to 23%, and nickel as high as 28%, which is why this grade outlasts 316L in aggressive chemical duty. Wall thickness ranges from 2 mm to 40 mm, and every batch ships with mill test certificates and third-party inspection reports. Along with Stainless Steel 904L Buttweld Fittings, Adarsh Stainless also stocks Stainless Steel 904L Bars, allowing customers to source matching piping and bar products from a single supplier.
Stainless Steel 904L Buttweld Fittings are austenitic fittings built to ASTM A403 and ASME SA403, covering elbows, tees, reducers, caps, and stub ends that weld directly into a pipe run. The grade is also listed as UNS N08904 and DIN 1.4539. Composition carries 19-23% chromium, 4-5% molybdenum, and 23-28% nickel, with carbon capped at 0.020%. The higher nickel and molybdenum content gives Stainless Steel 904L Buttweld Fittings better resistance to sulfuric acid, phosphoric acid, and chloride-rich environments than standard 316L fittings.
Table Of Content
Corrosion Resistance: The most outstanding feature of Stainless Steel 904L is its exceptional corrosion resistance. This alloy is highly resistant to a wide range of corrosive media, making it suitable for applications in harsh environments, such as the chemical and petrochemical industries.
High-Temperature Resistance: Stainless Steel 904L Pipe Fittings can withstand elevated temperatures, making it suitable for applications where heat resistance is essential, such as in heat exchangers and boiler systems.
Ductility and Weldability: This alloy is known for its excellent ductility, allowing for easy forming and welding. It can be readily welded using standard welding techniques, ensuring a strong and leak-free connection.
Longevity and Durability: Stainless Steel 904L buttweld fittings are built to last. They have a long service life, reducing the need for frequent replacements and maintenance.
Versatility: These fittings are versatile and can be used in a wide range of applications, including chemical processing, pharmaceuticals, food processing, desalination, and more.
Common types of Stainless Steel 904L Buttweld Fittings include elbows, tees, reducers, caps, and stub ends. These fittings come in various sizes, schedules, and specifications to meet the diverse requirements of different industries.
When selecting Stainless Steel 904L pipe fittings, it is crucial to consider factors like the working environment, temperature, pressure, and specific application requirements. Proper material selection and precise installation are essential to ensure the long-term performance and reliability of the fittings.
ASTM A403 / ASME SA403
ANSI B16.9, B16.25, B16.28, MSS-SP-43, MSS-SP-48, MSS-SP-59
Seamless Butt Weld Fittings : 1/2″ – 10″ Welded Butt Weld Fittings : 1/2″ – 48″
Seamless / Welded / Fabricated
SCH10, SCH20, SCH30, STD SCH40, SCH60, XS, SCH 80, SCH 100, SCH 120, SCH 140, SCH 160, XXS available with NACE MR 01-75
from 2 to 40 mm
R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom
90 Deg. Elbow, 45 Degree Elbow, LR/SR Elbow, Reducers, Tee, Cross, Bends 1.5d, 3d, 5d, 10d, U bend, 180 Deg Bend, Short / Long stubends, End Cap, Lap-joint Stub End
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | KS | AFNOR | EN |
| SS 904L | 1.4539 | N08904 | SUS 904L | 904S13 | STS 317J5L | Z2 NCDU 25-20 | X1NiCrMoCu25-20-5 |
| 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 | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 904L | 7.95 g/cm3 | 1350 °C (2460 °F) | Psi – 71000 , MPa – 490 | Psi – 32000 , MPa – 220 | 35 % |
Oil & Gas Industrires
Chemical Industries
Construction Industries
Offshore Pipelines & Pipe Works
Petrochemical Industry
Shipbuilding Industries
Hydraulic Applications
Piping Systems
Refining Industry
Food Processing Industry
Pulp & Paper Industry
Power Plant Industry
904L carries 4-5% molybdenum and up to 28% nickel, well above 316's 2-3% molybdenum and 10-14% nickel. That extra alloy content holds off pitting in sulfuric acid and chloride solutions where 304 and 316 offer lower resistance in sulfuric acid and chloride-rich environments.
Elbows, tees, reducers, caps, and stub ends cover most piping layouts, and these SS 904L Buttweld Fittings are the most commonly specified fittings for industrial piping systems. Crosses and swage nipples get specified less often, mostly on branch connections or diameter changes.
Yes. Low carbon content, capped at 0.020%, keeps carbide precipitation down during welding, so standard TIG or MIG procedures work without post-weld heat treatment in most cases.
Yes, they hold up reasonably well in heat exchanger and boiler service up to approximately 400°C. Beyond that band, strength drops off, and oxidation resistance weakens, so higher process temperatures usually call for a different alloy.
Yes, both seamless and welded are available in 1/2 inch to 10 inch, and welded or fabricated SS 904L butt-welded pipe fittings extend up to 48 inches for the larger diameters used in offshore and desalination lines.
