Metinox Overseas is a trusted SS 316L Pipe Fittings manufacturer and supplier in India. Our ASTM A403 WP316L fittings are manufactured from the low-carbon variant of Grade 316 stainless steel, with a maximum carbon content of 0.03%, making them completely immune from sensitization in the weld heat-affected zone. Unlike standard 316, the SS 316L pipe fittings can be used in the as-welded condition in heavy-gauge welded assemblies without any post-weld heat treatment (PWHT), delivering significant cost and schedule savings on complex piping systems.
The UNS S31603 / DIN 1.4404 / WERKSTOFF 1.4404 composition retains the same molybdenum content of 2 to 3% as standard Grade 316, providing identical pitting and crevice corrosion resistance in chloride-bearing media. This combination of superior weldability and full chloride resistance makes SS 316L pipe fittings the first-choice specification for pharmaceutical reactors, food and beverage processing piping, cryogenic service, offshore welded assemblies, and marine applications where weld integrity and corrosion resistance must both be guaranteed simultaneously.
We supply SS 316L pipe fittings in seamless (WP-S), welded (WP-W), and welded with radiographic examination (WP-WX) designations, covering all fitting types from 1/2" NB up to 48" NB across schedules SCH 5S to XXS. Our SS 316L buttweld fittings are fully certified to ASME B16.9 and ASTM A403 WP316L with EN 10204 3.1 mill test reports available on request.
Request a quote now!For engineers specifying fittings for welded assemblies, SS 316L pipe fittings deliver four decisive technical advantages over standard Grade 316:
The table below illustrates the key differences between standard SS 316 and SS 316L pipe fittings to assist procurement engineers in selecting the correct grade for their application:
| Property | SS 316 Pipe Fittings | SS 316L Pipe Fittings |
|---|---|---|
| UNS Number | S31600 | S31603 |
| DIN / EN | 1.4401 | 1.4404 |
| Carbon Content | 0.08% max | 0.03% max |
| Chromium | 16.0 to 18.0% | 16.0 to 18.0% |
| Nickel | 10.0 to 14.0% | 10.0 to 14.0% |
| Molybdenum | 2.0 to 3.0% | 2.0 to 3.0% |
| Sensitization Risk | Yes - above 425°C in HAZ | None - immune from sensitization |
| Post-Weld Heat Treatment | Required for critical service | Not required - as-welded condition |
| Heavy Gauge Welded Service | Not recommended | Ideal choice |
| Pitting Resistance | Excellent | Identical to 316 |
| Pharmaceutical / Food Use | Acceptable for thin-wall | Preferred for all weld classes |
| Cryogenic Service | Acceptable | Preferred |
| ASTM Standard | A403 WP316 | A403 WP316L |
For standard carbon grade, see:SS 316 Pipe Fittings - Standard Grade
| Parameter | Details |
|---|---|
| Material Grade | SS 316L (UNS S31603 / DIN 1.4404 / WERKSTOFF 1.4404) |
| ASTM Standard | ASTM A403 WP316L |
| Dimensions | ASME B16.9 (Butt Weld), ASME B16.11 (Socket Weld and Threaded) |
| Size Range | 1/2" NB to 48" NB |
| Wall Thickness | SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160, XXS |
| Seamless Designation | WP316L-S (WP-S) |
| Welded Designation | WP316L-W (WP-W) |
| Welded + X-Ray | WP316L-WX (WP-WX) |
| Seamless Size Range | 1/2" to 10" NB |
| Welded Size Range | 1/2" to 48" NB |
| Test Certificates | EN 10204 3.1 Mill Test Report, NACE MR0175 |
| Third Party Inspection | SGS, Bureau Veritas, DNV, TUV, Lloyds, IBR available on request |
| Carbon (C) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) | Manganese (Mn) | Silicon (Si) |
|---|---|---|---|---|---|
| 0.03% max | 16.0 to 18.0% | 10.0 to 14.0% | 2.0 to 3.0% | 2.0% max | 0.75% max |
Note: The 0.03% max carbon content in SS 316L pipe fittings is the critical parameter that eliminates carbide precipitation and sensitization during welding. The molybdenum content of 2.0 to 3.0% is identical to standard 316, ensuring that SS 316L pipe fittings deliver the same superior pitting resistance in chloride environments.
| Property | Tensile Strength | Yield Strength (0.2% Offset) | Elongation | Hardness (Brinell) |
|---|---|---|---|---|
| SS 316L (UNS S31603) | 485 MPa min | 170 MPa min | 40% min | 217 HB max |
| UNS | ASTM | DIN | WERKSTOFF | JIS | EN |
|---|---|---|---|---|---|
| S31603 | 316L | 1.4404 | 1.4404 | SUS 316L | X2CrNiMo17-12-2 |
Metinox Overseas manufactures and supplies the complete range of SS 316L pipe fittings in all standard configurations:
| SS 316L Pipe Fitting Type | Details and Specifications |
|---|---|
| SS 316L 90 Degree Long Radius Elbow | 90 LR Elbow per ASME B16.9, R = 1.5D, 1/2" to 48" NB, SCH 5S to XXS |
| SS 316L 90 Degree Short Radius Elbow | 90 SR Elbow per ASME B16.9, R = 1.0D, standard and heavy wall |
| SS 316L 45 Degree Elbow | 45 Degree Elbow per ASME B16.9, long radius, 1/2" to 48" NB |
| SS 316L 180 Degree Return Bend | Return Bend LR and SR per ASME B16.9 |
| SS 316L Equal Tee | Straight Tee per ASME B16.9, all outlets same size, 1/2" to 48" NB |
| SS 316L Reducing Tee | Reducing Tee per ASME B16.9, branch outlet smaller than run |
| SS 316L Concentric Reducer | Concentric Reducer per ASME B16.9, 1/2" x 1/4" to 48" x 36" |
| SS 316L Eccentric Reducer | Eccentric Reducer per ASME B16.9, flat side up or flat side down orientation |
| SS 316L End Cap / Pipe Cap | End Cap per ASME B16.9, 1/2" to 48" NB |
| SS 316L Stub End - Long and Short | Stub End MSS SP-43 and ASME B16.9, Type A and Type B, lap joint service |
| SS 316L Cross | Four-way Cross per ASME B16.9, equal and reducing configurations |
| SS 316L 3D and 5D Bend | Piggable Bends in 3D and 5D radius, custom radius bends also available |
ASTM A403 classifies SS 316L pipe fittings into three manufacturing designations based on production method and inspection level:
| Parameter | Seamless (WP-S) | Welded (WP-W) | Welded + X-Ray (WP-WX) |
|---|---|---|---|
| Size Range (NB) | 1/2" to 10" | 1/2" to 48" | 1/2" to 48" |
| Schedule Range | SCH 5S to XXS | SCH 5S to SCH 80 | SCH 5S to SCH 80 |
| Dimensional Standard | ASME B16.9 | ASME B16.9 | ASME B16.9 |
| Pressure Rating | Full schedule rating | Per weld efficiency | Full schedule rating |
The unique properties of SS 316L pipe fittings make them the preferred specification across the following high-value industries:
Pharmaceutical piping systems that use SS 316L pipe fittings are the standard of care in pharmaceutical reactors of Active Pharmaceutical Ingredient (API), Clean-In-Place (CIP) circuits, Water for Injection (WFI) distribution loops and product contact piping. The low number of carbon means that there are no corrosion sites in the weld joints and they are not contaminating. The free and finished surface of ASTM A403 WP316L fittings is in line with cGMP cleanroom standards and FDA regulations.
SS 316L pipe fittings are used for product transfer lines, CIP return circuits and sanitary process piping in breweries, dairy plants, edible oil processors and soft drink bottling lines. Molybdenum resistance to chloride plus low carbon sensitization immunity give the product a long, maintenance-free service life even in harsh environments of cleaning chemicals.
The SS 316L pipe fittings are very tough and ductile even at cryogenic temperatures to -196 degrees Celsius, and are therefore the most common in Liquid Nitrogen (LN2), Liquid Oxygen (LOX), Liquid Argon (LAR) and Liquefied Natural Gas (LNG) piping systems. The austenitic microstructure does not experience ductile to brittle transition at low temperatures which is the requirement in the design of cryogenic piping.
Oil and gas platforms and FPSOs as well as offshore structures are subjected to very aggressive chloride environments where pitting resistance and weld quality are essential. Seawater cooling systems, topside process piping, deluge and firewater systems and the offshore chemical injection lines are designed to use SS 316L pipe fittings with their 2 to 3% molybdenum content and sensitization-free weld zones.
ASTM A403 WP316L fittings are common in chemical plants that deal with dilute sulphuric acid, phosphoric acid, acetic acid and a wide variety of organic chemical streams in which molybdenum-bearing stainless steel is needed. The nozzle fittings of the heavy-section reactor and the piping connections of the vessel are made of the SS 316L pipe fittings in the as-welded state without PWHT, which minimizes the project cost and schedule.
SS 316L pipe fittings prices vary based on fitting type, size, wall thickness, material designation (WP-S / WP-W / WP-WX), and order quantity. Our pricing is transparent and competitive, sourced directly from approved mills.
Contact Metinox Overseas for current SS 316L pipe fittings price per kg in India and for an itemised quotation by fitting type and schedule.
Metinox Overseas exports SS 316L pipe fittings from India to all major industrial markets worldwide, including:
UAE, Saudi Arabia, Qatar, Kuwait, Oman, Bahrain, USA, UK, Germany, Netherlands, Singapore, Malaysia, South Africa, Australia, Canada, Brazil, Argentina, Mexico, Indonesia, Thailand, Vietnam, Nigeria, Egypt, Israel, and other markets on request.
Carbon content is the major difference. SS 316L pipe fittings have a maximum carbon content of 0.03, as opposed to 0.08 maximum in regular SS 316. This reduced carbon content causes 316L to be resistant to sensitization (formation of chromium carbides) in the weld heat-affected zone, and this eradicates the potential of intergranular corrosion attack. Their molybdenum content (2 to 3%) is the same and, thus, so is their pitting and crevice corrosion resistance. SS 316L is preferred where welding is required particularly in heavy-gauge assemblies where the as-welded condition is to be made use of without PWHT.
ASTM A403: This is the standard of wrought austenitic stainless steel buttweld fittings. WP shows wrought pipe fittings, and 316L shows the low-carbon Grade 316L chemistry (UNS S31603). The suffix S, W or WX also indicates a further identification of seamless, welded, or welded and radiographed manufacture. ASTM A403 WP316L fittings should meet all chemical composition, mechanical property, dimensional and non-destructive tests of the standard.
The pharmaceutical piping is of SS 316L pipe fittings. The low carbon means that weld areas in product contact piping do not experience any carbide precipitation and do not provide areas of microbiological contamination. The grade is also compliant with ASME BPE (Bio Processing Equipment) material, and is registered in the FDA food and drug contact surface guidelines. Critical product contact circuits are required to use WP-S seamless fittings.
WP-S denotes continuous manufacture, WP-W denotes welded manufacture and WP-WX denotes welded manufacture with 100 percent longitudinal seam radiographic inspection. WP-S pipe fittings of SS 316L are manufactured in 1/2 to 10 NB and are mandatory in the highest pressure service. The maximum coverage of WP-W and WP-WX is 48" NB, and radiographic traceability is the same as seamless in projects that mandate complete NDT documentation.
The SS 316L pipe fittings are produced with UNS S31603 (American name), DIN 1.4404 (European name), WERKSToff 1.4404 (German material number), and SUS 316L (Japanese name). These designations are synonymous with the same 0.03% max carbon low-carbon molybdenum-bearing austenitic stainless steel, and ASTM A403 WP316L fittings will be cross-certified to those synonymous grades to the EN 10204 3.1 material test report.
Complete your SS 316L piping system with our full range of Grade 316L products:
Metinox Overseas maintains ready stock of the most commonly specified SS 316L pipe fittings sizes and types for immediate dispatch. Our team of technical sales engineers is available to assist with material selection, certification requirements, third-party inspection coordination, and project-specific documentation packages.
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