Stainless Steel 904L Pipe Fittings — Grade Overview & Key Properties
Amardeep Steel Centre manufactures and supplies high-performance Stainless Steel 904L Pipe Fittings (UNS N08904 / 1.4539) conforming to ASTM A403 / ASME SA403 WP904L — the preferred grade for services involving sulphuric acid, chlorides and aggressive process chemicals where standard 316L fails. With over 30 years of experience in stainless steel supply, Amardeep Steel Centre is trusted by EPC contractors, OEMs and government projects across 40+ countries.
SS 904L Pipe Fittings (UNS N08904 / Werkstoff Nr. 1.4539) are designed for moderate-to-high corrosion resistance across various process conditions. The elevated chromium and nickel content, combined with molybdenum and copper additions, ensures outstanding resistance against chloride-induced pitting, crevice corrosion, and stress corrosion cracking outperforming conventional 316L and 317L grades. These fittings also exhibit excellent resistance to inorganic acids, heated phosphoric acid and the majority of organic acids, making them the preferred choice in chemical processing, oil & gas, and pharmaceutical industries.
The key advantage of stainless steel 904L fittings is their weldability, they can be joined using standard welding procedures with no pre-heat or post-weld heat treatment required. Available in seamless and welded constructions, in types including elbows, tees, reducers, caps, and crosses, they comply fully with ASTM A403 / ASME SA403 and ANSI B16.9 dimensional standards. Available in a full range of stainless steel pipe fittings types to suit any project requirement.
Every batch of 904L pipe fittings undergoes 100% PMI (Positive Material Identification) testing, dimensional inspection per ASME B16.9, and hydrostatic pressure testing before dispatch supported by EN 10204 3.1 Mill Test Certificates.
Superior Corrosion Resistance
High Ni-Cr-Mo-Cu content resists pitting, crevice corrosion & stress corrosion cracking
Wide Temperature Range
Performs reliably from cryogenic conditions up to 900–1150°C working temperatures
Certified Quality
ASTM A403 / ASME SA403 WP904L | ISO 9001:2015 | PED & NORSOK Approved
Need 904L pipe fittings? Get a competitive price from our team now.
Table of Contents
- 904L Pipe Fittings Specifications
- Equivalent Grades of SS 904L Pipe Fittings
- Types & Forms of 904L Pipe Fittings
- Chemical Composition of SS 904L Pipe Fittings
- Mechanical Properties of 904L Pipe Fittings
- SS 904L Pipe Fittings Weight Chart
- Heat Treatment & Tolerances
- Ready Stock of 904L Pipe Fittings
- Applications & Industries Served
- Why Choose Amardeep Steel?
- Related SS 904L Pipe Fittings Searches
- Frequently Asked Questions — Stainless Steel 904L Pipe Fittings
904L Pipe Fittings Specifications
Amardeep Steel Centre manufactures all stainless steel 904L pipe fittings to precise specifications to guarantee full compliance with global standards and demanding industry requirements.
|
Specification |
Details |
|---|---|
|
Standard |
ASTM A403 / ASME SA403 |
|
Grade |
WP904L / WP904L (S) |
|
Types |
Seamless / Welded / Fabricated |
|
Buttweld Fittings Size |
1/2″ to 48″ |
|
Forged Fittings Size |
1/8” to 4” |
|
Wall Thickness / Schedule |
Sch 5s, 10s, 40s, 80s, 10, 20, 40, STD, 60, 80, XS, 100, 120, 140, 160, XXS |
|
Bending Radius |
R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom |
|
Pressure Class (Forged) |
2000 LBS, 3000 LBS, 6000 LBS, 9000 LBS |
|
Dimensional Standards |
ANSI/ASME B16.9, B16.25, B16.28, MSS-SP-43, MSS-SP-48, MSS-SP-75 |
|
JIS Standards |
JIS B2312, JIS B2313 |
|
GOST Standards |
GOST 17375, GOST 17376, GOST 17378, GOST 17379 |
|
DIN Standards |
DIN 2605, DIN 2615, DIN 2616, DIN 2617 |
|
Manufacturing Process |
Push, Press, Forge, Cast, Mandrel, Hot Forming |
|
Surface Finish |
Plain / Pickled / Sand Blasted / Polished |
|
Melting Point |
1350 °C (2460 °F) |
|
Packing |
Wooden Pallet, Carton / Small Box, or as per Customer Requirement |
For the latest 904L pipe fittings price, contact our sales team. We offer competitive pricing for bulk orders with full MTR documentation and third-party inspection support.
Equivalent Grades of Stainless Steel 904L Pipe Fittings
| Standard | Werkstoff Nr. | UNS | JIS | BS | AFNOR | EN |
|---|---|---|---|---|---|---|
| SS 904L | 1.4539 | N08904 | SUS 904L | 904S13 | Z2 NCDU 25-20 | X1NiCrMoCu25-20-5 |
Types & Forms of Stainless Steel 904L Pipe Fittings
Amardeep Steel Centre produces a complete range of SS 904L pipe fittings to meet any project requirement:
- SS 904L 45 Degree & 90 Degree Elbow
- SS 904L 180 Degree Return Elbow
- ASTM A403 WP904L Seamless Elbow
- ASME SA403 WP904L Buttweld Elbow
- UNS N08904 Long / Short Radius Elbow
- SS 1.4539 Welded Elbow
- ANSI B16.9 WP904L Elbow
- SS 904L Equal Tee
- SS 904L Reducing Tee
- SS 904L Lateral Tee
- ASTM A403 WP904L Seamless Tee
- ASME SA403 WP904L Buttweld Tee
- UNS N08904 Welded Tee
- ANSI B16.9 WP904L Tee
- SS 904L Concentric Reducer
- SS 904L Eccentric Reducer
- ASTM A403 WP904L Seamless Reducer
- ASME SA403 WP904L Buttweld Reducer
- UNS N08904 Welded Reducer
- SS 1.4539 Butt Weld Reducer
- SS 904L End Cap
- ASTM A403 WP904L Pipe Cap
- ASME SA403 WP904L Seamless Cap
- UNS N08904 Buttweld Cap
- SS 1.4539 Welded Cap
- SS 904L Equal Cross
- SS 904L Reducing Cross
- ASTM A403 WP904L Seamless Cross
- ASME SA403 WP904L Buttweld Cross
- UNS N08904 Welded Cross
- ANSI B16.9 WP904L Cross
- SS 904L Socket Weld Elbow
- SS 904L Threaded Tee
- SS 904L Socket Weld Coupler
- SS 904L Forged Reducer Insert
- SS 904L Hex Nipple / Bush
- UNS N08904 Weldolet / Sockolet
904L Pipe Elbow
904L Pipe Tee
904L Pipe Reducer
904L Pipe Cap
904L Pipe Cross
904L Forged / Threaded Fittings
Chemical Composition of SS 904L Pipe Fittings
The precise chemical composition of our 904L pipe fittings is continuously monitored through in-house testing to ensure full compliance with ASTM A403 requirements.
| Grade | C (max) | Mn (max) | Si (max) | P (max) | S (max) | Cr | Ni | Mo | Cu |
|---|---|---|---|---|---|---|---|---|---|
| SS 904L (UNS N08904) | 0.020 | 2.00 | 1.00 | 0.045 | 0.035 | 19.0-23.0 | 23.0-28.0 | 4.0-5.0 | 1.0-2.0 |
Mechanical Properties of 904L Pipe Fittings
These properties demonstrate the material's ability to withstand pressure and physical stress during operation, meeting ASTM A403 WP904L requirements.
| Grade | Tensile Strength (MPa) Min. | Yield Strength (MPa) Min. | Elongation % Min. | Hardness (Brinell) Max. |
|---|---|---|---|---|
| WP904L | 490 | 220 | 35 | Rb 90 |
Physical Properties of SS 904L
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Modulus of Elasticity | 190 GPa |
| Specific Heat Capacity | 500 J/kg·K |
| Thermal Conductivity | 12 W/m·K |
| Melting Point | 1350 °C (2460 °F) |
SS 904L Pipe Fittings Weight Chart (Approx. kg)
The table below provides approximate weights for 90 Degree long-radius elbows and equal tees in SCH 40 and SCH 80. Contact us for exact weights for other fitting types and schedules.
| Nominal Size (NB) | OD (mm) | 90 Degree LR Elbow SCH 40 (kg) | 90 Degree LR Elbow SCH 80 (kg) | Equal Tee SCH 40 (kg) | Equal Tee SCH 80 (kg) |
|---|---|---|---|---|---|
| ½″ | 21.3 | 0.05 | 0.07 | 0.07 | 0.09 |
| ¾″ | 26.7 | 0.07 | 0.09 | 0.10 | 0.13 |
| 1″ | 33.4 | 0.12 | 0.16 | 0.17 | 0.22 |
| 1½″ | 48.3 | 0.27 | 0.37 | 0.38 | 0.52 |
| 2″ | 60.3 | 0.48 | 0.68 | 0.68 | 0.96 |
| 3″ | 88.9 | 1.28 | 1.80 | 1.80 | 2.54 |
| 4″ | 114.3 | 2.55 | 3.66 | 3.60 | 5.16 |
| 6″ | 168.3 | 7.50 | 11.0 | 10.6 | 15.6 |
| 8″ | 219.1 | 15.5 | 23.5 | 22.0 | 33.4 |
| 10″ | 273.0 | 28.4 | 44.0 | 40.2 | 62.3 |
| 12″ | 323.8 | 44.2 | 69.0 | 62.5 | 97.7 |
| 16″ | 406.4 | 85.0 | 136 | 120 | 192 |
| 20″ | 508.0 | 154 | 248 | 218 | 352 |
| 24″ | 609.6 | 253 | 410 | 358 | 580 |
Note: Weights are approximate and may vary ±5% based on manufacturer tolerances. All weights are for 904L (UNS N08904) material.
Heat Treatment & Tolerances of 904L Pipe Fittings
The final quality and reliability of a pipe fitting are heavily influenced by the heat treatment process and adherence to dimensional tolerances.
Heat Treatment Requirements
All stainless steel 904L pipe fittings are supplied in solution-annealed condition. This process involves heating the fittings to temperatures between 1090 °C and 1175 °C, followed by rapid water quenching. This critical treatment eliminates manufacturing stresses, dissolves carbides, and restores maximum corrosion resistance and toughness. No pre-heat or post-weld heat treatment is required when welding these fittings using standard procedures.
Dimensional Tolerances
We manufacture to the precise dimensional standards of ASME B16.9 for butt-weld fittings and ASME B16.11 for forged fittings. Every dimension from center-to-face measurement to bore angle is verified to ensure easy installation and reliable performance in service.
Ready Stock of Stainless Steel 904L Pipe Fittings
Amardeep Steel Centre maintains a ready stock of 904L pipe fittings in sizes ½″ to 24″ seamless and ½″ to 48″ welded. Standard schedules SCH 10S, 40S, 80S, and XS are available for immediate dispatch from our Mumbai warehouse. Custom sizes and special configurations are manufactured on an expedited basis.
Call +91-022-67439130 to confirm real-time stock availability and lead times.
Applications & Industries Served by 904L Pipe Fittings
The superior corrosion resistance of SS 904L pipe fittings makes them indispensable across a wide range of demanding industries often used alongside SS 904L Flanges and 904L Pipes & Tubes in complete piping assemblies:
| Industry | Application |
|---|---|
| Chemical Processing | Process equipment for the production of sulfuric, phosphoric, inorganic and organic acids, and phosphate-based fertilizers |
| Oil & Gas | Offshore and onshore piping systems requiring superior resistance to chloride and H2S environments |
| Pharmaceutical & Medical | Sterile process equipment and high-purity piping systems |
| Pulp & Paper | Digesters, bleaching equipment, and processing lines requiring resistance to acidic environments |
| Marine & Offshore | Seawater handling systems, heat exchangers, condensers, and offshore platforms |
| Water Treatment | Desalination equipment and wastewater treatment plants with high chloride exposure |
Domestic Supply of 904L Pipe Fittings Across India
We supply Stainless Steel 904L Pipe Fittings to customers across Mumbai, Delhi, Pune, Ahmedabad, Chennai, Hyderabad, Bangalore, Kolkata, Surat, and Rajkot ensuring fast domestic delivery from our central Mumbai warehouse.
International Export of 904L Pipe Fittings
Amardeep Steel Centre exports 904L Stainless Steel Pipe Fittings to the USA, UK, UAE, Saudi Arabia, Qatar, Kuwait, Germany, Singapore, Australia, South Africa, Brazil, and Malaysia. All export shipments include NABL-accredited test reports, Certificate of Origin (COO), EUR1, and FORM-E documentation.
Why Choose Amardeep Steel for 904L Pipe Fittings?
When you choose Amardeep Steel Centre, you are selecting a partner built on decades of manufacturing excellence, trusted by global industry leaders. With over 30 years of experience, here is what sets us apart:
- Manufacturing Excellence: Our in-house manufacturing facilities give us full control over the production process, ensuring consistent quality in every 904L fitting we deliver.
- Traceable Raw Materials: All raw materials are sourced from globally approved mills with full mill test reports (MTRs) and third-party inspection support.
- Fast Turnaround: We maintain a large ready stock of standard stainless steel 904L pipe fittings, enabling fast dispatch for immediate requirements.
- Certified Quality: Every fitting is supplied with EN 10204 3.1 / 3.2 Mill Test Certificates, conforming to PED, NACE, NORSOK, and other applicable standards.
- Global Export Experience: We export to the USA, UAE, Saudi Arabia, Germany, Singapore, South Korea, and Australia backed by reliable logistics and compliant documentation including NAFTA COO, EUR1, and FORM-E certificates.
- Technical Support: Our team of expert metallurgists and engineers is available 24/7 to provide guidance on material selection, design, and application requirements.
Get a Competitive Price Quote for 904L Pipe Fittings
Need 904L pipe fittings? Get a competitive price from our team now.
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Frequently Asked Questions - 904L stainless steel pipe fittings
1. What is the difference between 904L and 316L stainless steel pipe fittings?
SS 904L pipe fittings contain significantly higher nickel (23-28%), molybdenum (4-5%), and copper (1-2%) compared to 316L. This results in superior resistance to chloride pitting, crevice corrosion, and stress corrosion cracking, particularly in aggressive acidic environments where 316L would fail. 904L is the preferred choice for chemical, pharmaceutical, and offshore applications.
2. What standard do Amardeep Steel's 904L fittings conform to?
Our stainless steel 904L pipe fittings are manufactured to ASTM A403 / ASME SA403 WP904L. Dimensional standards include ANSI/ASME B16.9, B16.25, B16.28, MSS-SP-43, and MSS-SP-75. We also supply forged fittings to ASME B16.11 and MSS-SP-97.
3. Are 904L SS pipe fittings suitable for high-pressure applications?
Yes. Our 904L fittings are available in pressure classes from 2000 LBS to 9000 LBS for forged fittings, and in schedules up to XXS for buttweld fittings, making them suitable for high-pressure process piping systems.
4. What documentation do you provide with your 904L pipe fittings?
We provide EN 10204 3.1 Mill Test Certificates, Dimensional Inspection Reports, PMI (Positive Material Identification) Reports, Hydrostatic Test Reports, and Third-Party Inspection by agencies such as TUV, BV, SGS, DNV, Lloyds, and BVQI upon request.
5. How quickly can you deliver 904L pipe fittings?
Standard sizes are typically available from ready stock for immediate dispatch. Custom sizes and special configurations are manufactured on an expedited basis contact our sales team for specific lead time requirements.
6. Is 904L magnetic?
No. 904L is a fully austenitic stainless steel and is non-magnetic in the annealed condition. It will remain non-magnetic even after significant cold working.
7. Does 904L require post-weld heat treatment?
No. Due to its low carbon content, 904L has minimised risk of carbide precipitation during welding. No pre-heat or post-weld heat treatment is required when using standard welding procedures, which greatly simplifies fabrication.
