Special and Super Austenitic Stainless Steel Fittings Supplier, Stockist and Exporter
Table of Contents
Aurico Alloys LLP supplies special stainless steel fittings from ready stock in Mumbai to customers across India and in more than 40 export markets. Fittings carry the same corrosion duty as the pipe they join but see higher stress concentration at every change of direction, so grade traceability and wall thickness at the extrados matter more here than anywhere else in a piping system.
Special Stainless Steel covers high-alloy austenitic stainless grades bridging the gap between 316L and nickel alloys. Fittings are supplied with heat-number traceability and can be bevelled, tacked or pre-fabricated into spools on request.
Sizes and Specifications
| Size range | Butt-weld fittings 1/2" to 48" NB in Sch 5S to Sch XXS; forged socket-weld and threaded fittings 1/8" to 4" NB in 3000#, 6000# and 9000# classes. |
|---|---|
| Types and finishes | Elbows (45° and 90°, long and short radius), tees (equal and reducing), reducers (concentric and eccentric), caps, stub ends, couplings, unions, plugs and bushings. |
| Specifications | ASME B16.9 and B16.28 for butt-weld, ASME B16.11 for forged fittings, with material to ASTM B366 / A815 / B363 as applicable. |
| Certification | EN 10204 3.1 mill test certificate; 3.2 and third-party inspection on request |
| Origin | Indian and imported mills, fully traceable by heat number |
Specifications by Grade – Fittings
A specification is written for a product form. The standards below are the ones that cover fittings; the plate, bar and tube specifications for these grades are different documents and are listed on their own pages.
| Grade | UNS | Fittings specification |
|---|---|---|
| 904L | N08904 | ASTM B366 |
| 254 SMO | S31254 | ASTM A403 |
| AL-6XN | N08367 | ASTM B366 |
| Alloy 20 | N08020 | ASTM B366 |
| Alloy 28 | N08028 | ASTM A403 |
Grades and International Equivalents
| Grade | UNS | Werkstoff (W.Nr.) |
|---|---|---|
| Alloy 20 (Carpenter 20) | N08020 | 2.4660 |
| Alloy 28 (Sanicro 28) | N08028 | 1.4563 |
| Alloy 31 | N08031 | 1.4562 |
| Alloy 904L | N08904 | 1.4539 |
| 254 SMO | S31254 | 1.4547 |
| AL-6XN | N08367 | — |
| Alloy 926 | N08926 | 1.4529 |
| AM-350 | S35000 | — |
Chemical Composition
These grades carry 20-27% chromium, 18-31% nickel and 4-7% molybdenum, with copper added in Alloy 20 and 904L for sulphuric acid service and nitrogen in 254 SMO and AL-6XN to lift pitting resistance.
Mechanical and Physical Properties
Typical tensile strength is 490-690 MPa. PREN values of 43 and above for 254 SMO and AL-6XN give pitting resistance close to nickel alloys at appreciably lower cost.
Industry Applications
How fittings is used
Fittings are factory-made wrought components to ASTM B366, dimensioned to ASME B16.9 for butt-weld and ASME B16.11 for socket-weld. They are the 45, 90 and 180 degree elbows, tees, reducers, caps and lap-joint stub ends that change direction, branch or change bore in a process line, and they are specified to match the pipe they join in both alloy and schedule so the weld and the corrosion behaviour stay continuous.
| Industry | Typical use |
|---|---|
| Chemical processing | Sulphuric and phosphoric acid plant, pickling lines and heat exchangers. |
| Pollution control | Flue-gas desulphurisation absorbers and scrubber internals. |
| Desalination | Seawater heat exchangers and high-chloride service. |
| Pulp and paper | Bleach plant equipment and chloride-bearing white liquor systems. |
| Oil and gas | Produced-water handling and offshore process equipment. |
Testing and Certification
Every consignment ships with an EN 10204 3.1 mill test certificate stating heat number, chemical analysis and mechanical properties. Depending on grade and specification we can supply positive material identification (PMI), ultrasonic and dye-penetrant testing, intergranular corrosion testing to ASTM A262 or G28, hydrostatic testing, and third-party inspection release notes from Lloyd's Register, Bureau Veritas, SGS or TUV.
Aurico Alloys LLP operates an ISO 9001:2015 quality management system. Material for sour service can be supplied certified to NACE MR0175 / ISO 15156 where the grade permits.
Frequently Asked Questions
Request a Quotation
Send your grade, size, quantity and specification and we will respond with price and lead time, usually the same working day. Call +91 7977 88 6611 or email info@auricoalloys.com.