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Petrofit Alloys & Engineering LLP is a specialised ASTM A403 SS316 / SS316L / SS316H buttweld pipe fittings manufacturers in India, supplying elbows, tees, reducers, caps and stub ends for corrosive and chloride‑bearing services. Our SS 316‑series fittings are used in chemical and petrochemical plants, offshore platforms, desalination units, pharmaceutical facilities and food‑grade processing lines where standard 304 stainless steel can be risky. By combining manufacturing with strong inventory in common sizes and schedules, we help EPC contractors, fabricators and plant owners secure reliable SS316 buttweld pipe fittings, SS316L buttweld pipe fittings and SS316H buttweld pipe fittings with consistent quality and documentation.
The 316 family builds on 304 stainless steel by adding molybdenum, which significantly improves resistance to pitting and crevice corrosion in chloride‑rich media. SS316 buttweld pipe fittings are therefore preferred in lines handling seawater, brine, caustics, cleaning chemicals and many process fluids found in modern plants. They maintain good weldability and formability, allowing fabricators to produce complex spools and manifolds while meeting code requirements for pressure and temperature.
Within this series, SS316L buttweld pipe fittings use lower carbon to minimise sensitisation after welding, making them well‑suited to heavily welded systems and hygienic applications. SS316H buttweld pipe fittings offer enhanced creep strength for higher‑temperature duties such as steam and hot‑process circuits. In many projects, designers combine these 316‑series fittings with other grades from our portfolio—for example, non‑critical lines in ASTM A403 SS304 / SS304L / SS304H Buttweld Pipe Fittings and seawater or firewater systems in ASTM A182 F51 Buttweld Pipe Fittings—to balance performance, cost and long‑term reliability across the entire piping network.
Our SS316 buttweld pipe fittings, SS316L buttweld pipe fittings and SS316H buttweld pipe fittings are manufactured and supplied in accordance with the following core standards:
| Item | Details |
|---|---|
| Material grades | SS 316, SS 316L, SS 316H (ASTM A403 / ASME SA403 WP316, WP316L, WP316H) |
| Product forms | Long & short radius elbows, concentric & eccentric reducers, equal & reducing tees, caps, stub ends |
| Manufacturing types | Seamless, welded and fabricated buttweld fittings |
| Dimensional codes | ASME/ANSI B16.9, ASME B16.28, MSS‑SP‑43 |
To support both process lines and utility networks, our SS316 buttweld pipe fittings, SS316L buttweld pipe fittings and SS316H buttweld pipe fittings are produced in a wide range of sizes and wall thicknesses.
| Item | Details |
|---|---|
| Size range | 1/8" NB to 48" NB (seamless, 100% X‑ray welded and fabricated options) |
| Available schedules | Sch 5S, Sch 10S, Sch 40S, Sch 80S, Sch 160S, Sch XXS (including NACE‑compatible schedules) |
For elbows and bends, Petrofit can supply SS316 buttweld pipe fittings, SS316L buttweld pipe fittings and SS316H buttweld pipe fittings with various radii to suit layout constraints and flow requirements:
| Item | Details |
|---|---|
| Standard radii | R = 1D, 2D, 3D, 5D, 6D, 8D, 10D |
| Custom radii | Special radii manufactured to project drawings and layouts |
SS316 buttweld pipe fittings, SS316L buttweld pipe fittings and SS316H buttweld pipe fittings are used where chloride exposure or aggressive media make 304 risky. Typical duties include chemical process lines, solvent and caustic transfer, brine and seawater piping, and utilities exposed to cleaning chemicals. On offshore platforms, SS316L buttweld pipe fittings serve in produced‑water systems, utility networks and firewater mains in marine atmospheres. Food, pharma and biotech plants use 316L fittings in CIP loops, process transfer lines and utilities. For hotter services such as steam, heaters and reformer outlets, SS316H buttweld pipe fittings provide added creep strength while retaining 316‑level corrosion resistance.
Choosing SS316 buttweld pipe fittings, SS316L buttweld pipe fittings and SS316H buttweld pipe fittings offers better pitting and crevice‑corrosion resistance than lower‑alloy stainless or carbon steels, particularly in chloride‑bearing and marine environments. Their good weldability and availability in common schedules make fabrication and qualification straightforward. Using the 316 family also lets specifiers handle a wide temperature range with one material system: 316L for heavily welded or hygienic circuits, 316 for general duty, and SS316H buttweld pipe fittings for elevated‑temperature lines. This simplifies line class design, spare‑parts stocking and procurement, because all grades share compatible geometry and end preparations.
To ensure compatibility across global mills and standards, SS316 buttweld pipe fittings, SS316L buttweld pipe fittings and SS316H buttweld pipe fittings can be mapped to the following common equivalents:
| Standard / Specification | 316 | 316L | 316H |
|---|---|---|---|
| ASTM / ASME | ASTM A403 WP316 | ASTM A403 WP316L | ASTM A403 WP316H |
| UNS | S31600 | S31603 | S31609 |
| EN / WNR | 1.4401 | 1.4404 | 1.4910 |
| JIS | SUS316 | SUS316L | SUS316H |
| Typical DIN designation | X5CrNiMo17‑12‑2 | X2CrNiMo17‑12‑2 | X6CrNiMoTi17‑12‑2 |
Understanding these equivalents makes it easier to evaluate material test certificates and qualify different mills' SS316 buttweld pipe fittings and SS316L buttweld pipe fittings against project specifications.
SS316 buttweld pipe fittings, SS316L buttweld pipe fittings and SS316H buttweld pipe fittings from Petrofit are used across a wide array of sectors. In offshore oil and gas, they are installed in produced‑water treatment, seawater cooling, chemical injection and utility systems. In refineries and petrochemical plants, 316‑series fittings appear in fractionation units, caustic wash systems and many corrosive utilities.
Chemical processing plants rely on SS316L buttweld pipe fittings where acids, alkalis and cleaning chemicals are present, while pharmaceutical and biotech facilities use them in hygienic and clean‑utility systems. Food and beverage plants specify SS316L buttweld pipe fittings for applications where cleaning agents or chloride‑bearing CIP solutions are used. Power plants, desalination facilities and water‑treatment plants also use 316‑series fittings for brine, condensate and high‑purity water lines.
Petrofit Alloys & Engineering LLP combines manufacturing, stocking and export capability, making us a reliable partner for SS316 buttweld pipe fittings, SS316L buttweld pipe fittings and SS316H buttweld pipe fittings. We supply fittings manufactured to recognised standards, backed by EN 10204 3.1 certification and, when requested, third‑party inspection.
Our team understands the practical challenges of specifying 316‑series stainless steel in real plants: balancing corrosion resistance, welding requirements and budget constraints. We work with design offices and site teams to match the right grade—316, 316L or 316H—to each service, and we coordinate deliveries to support construction and shutdown schedules. With experience supplying projects in India, the Middle East, Europe, Asia‑Pacific and North America, we can manage export packing, markings and documentation as per project needs.
316L is preferred when the system involves extensive welding, thicker sections or limited post-weld heat treatment, as the lower carbon content reduces the risk of intergranular corrosion in the HAZ.
SS316H is intended for elevated-temperature service where creep strength is critical. Design limits still depend on code and pressure, but 316H offers better high-temperature performance than 316/316L.
They provide better chloride resistance than 304, but in full seawater many designers now prefer duplex, super duplex or 6Mo alloys; 316/316L are often used in splash zones and lightly loaded areas.
Yes, provided the design is based on the grade with the lowest allowable stress and welding procedures are qualified; mixing grades is common when some lines run hotter than others.
Share the grade (316, 316L, 316H), size, schedule, fitting type, quantity and any special testing or inspection requirements, plus delivery location and required dates.
Every batch of SS316 buttweld pipe fittings, SS316L buttweld pipe fittings and SS316H buttweld pipe fittings from Petrofit is produced under a structured quality-management system. Materials are purchased from approved mills, verified by PMI and traceable via heat numbers. Forming, heat treatment and machining are controlled to maintain mechanical properties and corrosion performance.
Dimensional checks are carried out as per ASME B16.9 or customer drawings, and where specified we perform hydrostatic testing, dye-penetrant testing, radiography or ultrasonic examination. Documentation includes EN 10204 3.1 MTCs and, when required, third-party reports. This approach ensures that your 316-series fittings can be audited and accepted under stringent project quality plans.
If you are looking for ASTM A403 SS316 / SS316L / SS316H buttweld pipe fittings manufacturers in India, Petrofit Alloys & Engineering LLP can support you from specification to delivery. Share your grade, sizes, schedules, fitting types and any testing needs, and we’ll provide a technically compliant, competitively priced quotation.
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