Stainless Steel 904L Socket Weld Fittings
ASTM A182 F904L • UNS N08904 • Werkstoff 1.4539 • ASME B16.11 • Class 3000–9000
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Stainless Steel 904L socket weld fittings are forged products designed for a pipe system to withstand high pressure, corrosive and aggressive environments. These fittings, which incorporate a high percentage of nickel, chromium, molybdenum and copper, are from the super-austenitic grade 904L (UNS N08904 / Werkstoff 1.4539) and offer exceptional resistance to sulphuric acid, phosphoric acid, chloride pitting corrosion and stress-corrosion cracking — where standard 304 and 316 grades are ineffective. Each 904L socket weld fitting at Aashish Metal & Alloys Each 904L socket weld fitting… is forged and machined to Class 3000, 6000 and 9000 of ASME B16.11 dimensional standard of ASME B16.11, NB 1/8″ to 4″ to ASTM A182 / ASME SA182 F904L standard. Elbows, tees, crosses, couplings, unions, caps, plugs, bushes and outlet fittings are all covered in our range, all of which are stamped with a unique heat number for full traceability. Whether you’re constructing a desalination line, a chemical reactor loop or an offshore process skid, the 904L fittings can help you build leak-free, weldable and long-lasting joints that are backed up by mill test certificates, NACE compliance options and global export reliability.
- What Are Stainless Steel 904L Socket Weld Fittings?
- Stainless Steel 904L Socket Weld Fittings Specifications
- Stainless Steel 904L Socket Weld Fittings Chemical Composition (%)
- Related Types Of Stainless Steel 904L Socket Weld Fittings
- Mechanical Properties of Stainless Steel 904L Socket Weld Fittings
- Stainless Steel 904L Socket Weld Fittings Equivalent Grades (Cross-Reference)
- Socket Weld Dimensions — ASME B16.11 (Class 3000, mm)
- Available 904L Socket Weld Fitting Types
- Stainless Steel 904L Socket Weld Fittings Applications
- 904L vs 316L vs 317L (Comparison)
- Manufacturing, Quality & Testing
- Standards & Certifications
- Related Products
- FAQs - Stainless Steel 904L Socket Weld Fittings
What Are Stainless Steel 904L Socket Weld Fittings?
904L is a low-carbon, non-stabilised austenitic stainless steel with a high alloy load that places it a clear step above conventional stainless grades. Its elevated nickel and molybdenum content suppresses work-hardening, while added copper gives it a distinct edge in reducing acids such as sulphuric acid. The result is a fitting that is both rugged and easy to weld, with excellent formability and a service life that justifies its premium over 316/317 grades.
Because 904L socket weld fittings are forged rather than cast, the grain flow follows the contour of the part, producing a denser, stronger and more pressure-tolerant joint. The socket weld design — where the pipe is inserted into a recessed socket and fillet-welded around the hub — delivers a strong, leak-resistant connection ideal for small-bore, high-pressure lines where radiography of a butt weld is impractical.
What Aashish Metal & Alloys supplies
- Full forged socket weld range: 45° & 90° elbows, equal & reducing tees, crosses, full/half/reducing couplings, unions, caps, plugs and bushes.
- Branch outlet (olet) fittings: weldolet, sockolet, thredolet, elbolet, nipolet and lateral outlets.
- Screwed / NPT & BSP threaded variants and swage nipples, hex nipples, boss and reducer inserts.
- Sizes 1/8″ to 4″ NB in Class 2000, 3000, 6000 and 9000 LBS ratings.
Stainless Steel 904L Socket Weld Fittings Specifications
| Parameter | Specification |
|---|---|
| Standard / Grade | ASTM A182 / ASME SA182 F904L |
| UNS Number | N08904 |
| Werkstoff (DIN) | 1.4539 |
| Dimensional Standards | ASME B16.11, MSS SP-79 / 83 / 95 / 97, BS 3799, DIN 2986 |
| Size Range | 1/8″ NB to 4″ NB |
| Pressure Class | 2000, 3000, 6000 & 9000 LBS |
| Construction | Hot forged |
| Fitting Types | Socket weld & screwed / threaded |
| Connection | Socket weld (fillet) / NPT / BSP |
Stainless Steel 904L Socket Weld Fittings Chemical Composition (%)
| Element | C | Mn | Si | P | S | Cr | Mo | Ni | Cu | N |
|---|---|---|---|---|---|---|---|---|---|---|
| Min | — | — | — | — | — | 19.0 | 4.0 | 23.0 | 1.0 | — |
| Max | 0.020 | 2.00 | 1.00 | 0.045 | 0.035 | 23.0 | 5.0 | 28.0 | 2.0 | 0.10 |
We Supplied a Comprehensive Range Of 904L Stainless Steel Socket Weld Fittings
Related Types Of Stainless Steel 904L Socket Weld Fittings
SS 904L Socket weld Elbow
SS 904L Socket weld Tee
SS 904L Socket weld Full Coupling
SS 904L Socket weld Half Coupling
SS 904L Socket weld Cross
SS 904L Socket weld Union
SS 904L Socket weld Pipe Cap
SS 904L Socket weld Boss
Mechanical Properties of Stainless Steel 904L Socket Weld Fittings
| Property | Value |
|---|---|
| Density | 7.95 g/cm³ |
| Melting Point | 1300–1390 °C (2372–2534 °F) |
| Tensile Strength | 490 MPa (71,000 psi) min |
| Yield Strength (0.2% offset) | 220 MPa (32,000 psi) min |
| Elongation | 35% min |
Stainless Steel 904L Socket Weld Fittings Equivalent Grades (Cross-Reference)
| UNS | Werkstoff | EN | BS | JIS | AFNOR | KS |
|---|---|---|---|---|---|---|
| N08904 | 1.4539 | X1NiCrMoCu25-20-5 | 904S13 | SUS 904L | Z2 NCDU 25-20 | STS 317J5L |
Socket Weld Dimensions — ASME B16.11 (Class 3000, mm)
| NPS | C–E Elbow/Tee/Cross (A) | C–E 45° Elbow (C) | Band OD (H) | Coupling End-End (W) | Min. Wall (G) |
|---|---|---|---|---|---|
| 1/2″ | 33 | 25 | 38 | 48 | 4.09 |
| 3/4″ | 38 | 28 | 44 | 51 | 4.32 |
| 1″ | 44 | 33 | 56 | 60 | 4.98 |
| 1-1/4″ | 51 | 35 | 62 | 67 | 5.28 |
| 1-1/2″ | 60 | 43 | 75 | 79 | 5.56 |
| 2″ | 64 | 44 | 86 | 86 | 7.14 |
| 3″ | 95 | 64 | 146 | 108 | 8.84 |
| 4″ | 114 | 79 | 152 | 121 | 11.18 |
Available 904L Socket Weld Fitting Types
| Fitting | Common Designations | Available Classes |
|---|---|---|
| 90° & 45° Elbow | F904L SW elbow, N08904 SW elbow | 3000 / 6000 / 9000 |
| Equal & Reducing Tee | 904L SW tee, N08904 SW tee | 3000 / 6000 / 9000 |
| Cross | 904L SW cross, 1.4539 cross | 3000 / 6000 / 9000 |
| Full / Half / Reducing Coupling | 904L SW coupling, N08904 coupling | 3000 / 6000 / 9000 |
| Union | F904L SW union, 1.4539 union | 3000 / 6000 |
| Cap & Plug | 904L SW cap, square / hex / round plug | 3000 / 6000 / 9000 |
| Bush / Bushing & Reducer Insert | 904L SW bush, reducer insert | 3000 / 6000 |
| Outlet fittings (olets) | Weldolet, sockolet, thredolet, elbolet, nipolet | 3000 / 6000 |
| Swage Nipple & Hex Nipple | 904L swage nipple, hex nipple | Sch / forged |
| Boss & Branch Outlet | 904L SW boss, branch outlet | 3000 / 6000 |
Stainless Steel 904L Socket Weld Fittings Applications
| Industry | Typical Use Case |
|---|---|
| Chemical & Petrochemical | Sulphuric, phosphoric & acetic acid lines, reactor and transfer piping. |
| Oil & Gas / Refining | Sour service, scrubber and acid-gas handling systems. |
| Seawater & Desalination | Reverse-osmosis, brine and cooling-water circuits. |
| Power Generation | Flue-gas desulphurisation (FGD) and condenser piping. |
| Pulp & Paper | Bleaching plant and chemical recovery lines. |
| Pharma & Food Processing | Hygienic acid-resistant process piping. |
| Marine & Offshore | Topside process skids exposed to chloride spray. |
904L vs 316L vs 317L (Comparison)
| Property | 904L (N08904) | 316L (S31603) | 317L (S31703) |
|---|---|---|---|
| Nickel % | 23–28 | 10–14 | 11–15 |
| Molybdenum % | 4–5 | 2–3 | 3–4 |
| Copper % | 1–2 | — | — |
| Acid resistance | Excellent | Moderate | Good |
| Chloride pitting (PREN) | ~35 | ~24 | ~28 |
| Relative cost | Higher | Low | Medium |
| Best for | Acids, seawater | General service | Mild chloride |
ASTM A182 SS 904L Soketweld Forged Fittings Size Range & Dimensions
| DN-NPT | MAJOR DIAMETER MM | TAPPING /DRILL SIZE MM | TPI | PITCH MM |
|---|---|---|---|---|
| 1/16″ | 7.895 | 6.00 | 27 | 0.941 |
| 1/8″ | 10.242 | 8.25 | 27 | 0.941 |
| 1/4″ | 13.616 | 10.70 | 18 | 1.411 |
| 3/8″ | 17.055 | 14.10 | 18 | 1.411 |
| 1/2″ | 21.223 | 17.40 | 14 | 1.814 |
| 3/4″ | 26.568 | 22.60 | 14 | 1.814 |
| 1″ | 33.228 | 28.50 | 11.5 | 2.209 |
| 1¼” | 41.985 | 37.00 | 11.5 | 2.209 |
| 1½” | 48.054 | 43.50 | 11.5 | 2.209 |
| 2″ | 60.092 | 55.00 | 11.5 | 2.209 |
| 2½” | 72.699 | 65.50 | 8 | 3.175 |
| 3″ | 88.608 | 81.50 | 8 | 3.175 |
| 3½” | 101.316 | 94.30 | 8 | 3.175 |
| 4″ | 113.973 | 107.00 | 8 | 3.175 |
| 5″ | 141.300 | 134.384 | 8 | 3.175 |
| 6″ | 168.275 | 161.191 | 8 | 3.175 |
| 8″ | 219.075 | 211.673 | 8 | 3.175 |
| 10″ | 273.050 | 265.311 | 8 | 3.175 |
| 12″ | 323.850 | 315.793 | 8 | 3.175 |
SS 904L Socket weld Fittings Class, Size & Wall Thickness
| DN-NPT | MAJOR DIAMETER MM | TAPPING /DRILL SIZE MM | TPI | PITCH MM |
|---|---|---|---|---|
| 1/16″ | 7.895 | 6.00 | 27 | 0.941 |
| 1/8″ | 10.242 | 8.25 | 27 | 0.941 |
| 1/4″ | 13.616 | 10.70 | 18 | 1.411 |
| 3/8″ | 17.055 | 14.10 | 18 | 1.411 |
| 1/2″ | 21.223 | 17.40 | 14 | 1.814 |
| 3/4″ | 26.568 | 22.60 | 14 | 1.814 |
| 1″ | 33.228 | 28.50 | 11.5 | 2.209 |
| 1¼” | 41.985 | 37.00 | 11.5 | 2.209 |
| 1½” | 48.054 | 43.50 | 11.5 | 2.209 |
| 2″ | 60.092 | 55.00 | 11.5 | 2.209 |
| 2½” | 72.699 | 65.50 | 8 | 3.175 |
| 3″ | 88.608 | 81.50 | 8 | 3.175 |
| 3½” | 101.316 | 94.30 | 8 | 3.175 |
| 4″ | 113.973 | 107.00 | 8 | 3.175 |
| 5″ | 141.300 | 134.384 | 8 | 3.175 |
| 6″ | 168.275 | 161.191 | 8 | 3.175 |
| 8″ | 219.075 | 211.673 | 8 | 3.175 |
| 10″ | 273.050 | 265.311 | 8 | 3.175 |
| 12″ | 323.850 | 315.793 | 8 | 3.175 |
For Stainless Steel 904L Socket Weld Fittings price list
Request the latest Stainless Steel 904L Socket Weld Fittings List. Please click on the request a quote button or click here to request the updated price list and ready stock information along with your requirement. Aashish Metal & Alloys maintains a stock of all standard items and can export them at best price for 904L Stainless Steel Socket Weld Fittings
We supply of variety SS 904L Socket Weld Fittings
Aashish Metal & Alloys is a Highly Acclaimed Manufacturer & suppliers of Stainless Steel 904L Socket weld Forged Fittings offering all varieties in all types of 904L Stainless Steel in all sizes, with more then 52 countries worldwide.
| Stainless Steel 904L Socket weld Fittings | Stainless Steel 904L Forged Socket Weld Fittings |
| SS 904L High Pressure Socket weld Fittings | Stainless Steel 904L Socket weld 45 deg. Elbow |
| UNS N08904 Socket weld Fittings | Stainless Steel 904L Forged Socket weld Tee |
| SS 904L Socket Weld 45 Deg Elbow Suppliers | SS 904L 90 Degree Socket weld Elbow |
| SS 904L Socket weld End Cap Dealer | SS 904L Socket weld Half Coupling Exporter |
| 904L SS Socket Weld Tee Stockholder | SS 904L Socket Weld Reducing Tee Distributors |
| SS 904L Socket weld Equal Cross | ANSI B16.11 SS 904L Socket weld Pipe Cap |
| UNS N08904 Socket weld Unequal Cross | SS 904L High Pressure Socket weld Fittings Manufacturer |
| 904L Stainless Steel Socket weld Coupling | SS 904L Socket weld Reducing Couplings |
| DIN 1.4539 Forged Socket weld Tee | DIN 1.4539 Socket weld Equal Cross |
| Stainless Steel 904L Socket weld Full Coupling | Stainless 904L Forged Socket weld Union |
| SS 904L Socket weld Equal Tee | SS 904L Socket Weld Half Coupling Stockist |
| ASTM A182 Stainless Steel 904L Socket Weld Boss | ASME SA182 SS 904L Socket weld Pipe Cap |
Manufacturing, Quality & Testing
Every 904L socket weld fitting we ship passes a controlled production and inspection sequence designed to meet national and international codes:
- Fine-grained forging from certified ASTM/ASME SA182 F904L stock.
- CNC machining of socket bore and hub to ASME B16.11 tolerances.
- Solution annealing for optimum corrosion resistance and grain structure.
- Positive Material Identification (PMI) on every heat lot.
- Mechanical testing: tensile, hardness and elongation.
- Corrosion testing: intergranular corrosion (IGC), pitting resistance on request.
- Dimensional, visual and dye-penetrant inspection before dispatch.
Documentation supplied: Mill Test Certificate (EN 10204 3.1), raw-material certificate, heat-treatment & radiography reports, PMI report, and NACE MR0103 / MR0175 compliance where specified.
Standards & Certifications
- ASTM A182 / ASME SA182 — forged stainless steel pipe fittings.
- ASME B16.11 — dimensional standard for forged socket weld fittings.
- MSS SP-79, SP-83, SP-95, SP-97 & BS 3799 — supplementary dimensional standards.
- EN 10204 3.1 — material test certification.
- NACE MR0103 / MR0175 — sour-service compliance (on request).
- ISO 9001 quality-management certified facility.
Check Our Related Products
FAQs - Stainless Steel 904L Socket Weld Fittings
It is a forged pipe-connection fitting made from super-austenitic stainless steel 904L (UNS N08904). The pipe slots into a recessed socket and is fillet-welded around the hub, creating a strong, leak-tight joint ideal for small-bore, high-pressure lines.
We supply 904L socket weld fittings from 1/8″ to 4″ NB in Class 2000, 3000, 6000 and 9000 LBS ratings, all machined to ASME B16.11.
They are forged to ASTM A182 / ASME SA182 F904L and dimensioned to ASME B16.11, with MSS SP-79/83/95/97 and BS 3799 also supported.
Yes. Every order ships with an EN 10204 3.1 mill test certificate, raw-material certificate and heat traceability. PMI, IGC and NACE compliance reports are available on request.
Yes — 904L’s copper-molybdenum chemistry makes it one of the preferred stainless grades for dilute and concentrated sulphuric acid handling, as well as phosphoric and acetic acid systems.
Yes. Aashish Metal & Alloys exports globally with export-grade packaging, documentation and on-time dispatch to the Middle East, Europe, Southeast Asia, Africa and the Americas.
Need 904L Socket Weld Fittings With Certified Traceability?
Get a same-day quotation, current stock list and full dimensional datasheet from Aashish Metal & Alloys — your trusted manufacturer, stockist and exporter of 904L forged fittings.
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