Stainless Steel 316 Flanges - Manufacturer, Supplier

SS 316 Flanges are forged pipe connection components made of austenitic stainless steel grade 316 and conform to ASTM A182 / ASME SA182 standards. Grade 316 is different from standard 304 as it contains 2-3% molybdenum, which improves pitting resistance in chloride-rich environments. These flanges are the right choice for marine pipelines, coastal chemical plants and offshore platforms where 304 loses integrity over time.

Piyush Steel produces SS 316 Flanges to UNS S31600 and Werkstoff Nr. 1.4401 / 1.4436 designations, covering sizes from ½" to 48" in pressure classes 150# through 2500#.

Chromium content of 16–18% builds the passive oxide layer resisting general corrosion. Combined with molybdenum, this grade handles dilute sulfuric acid, phosphoric acid, and seawater service where lower-alloy flanges pit and fail. SS 316 retains mechanical strength up to 870°C in intermittent service and 925°C in continuous duty. At Piyush Steel, we offer twelve SS 316 flange configurations for process, marine and utility systems. Each type is designed for a specific joint geometry, pressure rating or installation condition. Piyush Steel stocks all standard flange types and supplies custom dimensions against drawing for non-standard bore sizes.

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Stainless Steel 316 Flanges description-
Stainless Steel 316 Flanges have great resistance to reducing media, oxidizing agents, atmospheric corrosion and other corrosive agents. It has great workability in polluted marine waters. It has also great resistance to IGC attacks in the welded conditions. It has great toughness and strength at higher temperatures. In the annealed conditions structure of flanges are non-magnetic, however, after the cold working operation, it becomes magnetic in nature. These grade flanges are weldable with all type of standard welding operations. This grade is combined with chromium, nickel, and molybdenum and also it is known as UNS S31600. SS flanges are developed to offer great resistance to abrasion and corrosion. In addition to molybdenum, its general corrosion resistance ability is improved. It has great resistance ability to pitting and crevice corrosion cracking. SS flanges offer a great amount of creep, tensile and stress to rupture strength even in the hoisted temperatures. The different finishing process is exposed in these flanges to attain precise dimensions and surface finish. Industrial coats are added to add prevention from contamination. These flanges have great weldability and can be welded by all standard welding operation such as TIG, MIG, SAW, resistance welding and arc welding. Moreover, it is weldable with or without filler materials.

Quality section-

Quality Assurance is run on a dedicated program custom-designed for flanges and the added operations various industries require. As a stainless steel 316 flanges supplier, our team conducts destructive and non-destructive tests on all our 316 flanges, such as hydrostatic testing, charpy testing, hardness testing, tensile testing, PMI testing and ultrasonic testing on each batch.

This process is regulated from start to finish by international standards. Our commitment ensures you a reliable partner for stainless steel 316 flange manufacturing. We are dedicated to consistently and accurately delivering the quality you expect. Every test result is also recorded, then validated in line with the original order specifications prior to dispatch approval, thus closing the gap between client specifications and actual shipments.

Destructive tests-

•   hydrostatic test
•   Charpy test
•   mechanical test
•   hardness test
•   compression test
•   tensile test
•   flaring test
•   leakage test
•   flattening test

Material tests-

•   positive material test (PMI)
•   micro/ macro test
•   spectro analysis
•   intergranular corrosion test (IGC)
•   ultrasonic test
•   radiographic test
•   pitting corrosion test

We attach some sort of documentation reports along with a supplied range of products for quality assurance. We also provide some manuals and reports so customers can easily use these flanges.

Reports-

•   attested certificate by suppliers
•   fumigation certificate
•   raw material test report
•   NABL test report
•   mill test report
•   quality assurance plan
•   heat treatment charts

Documents-

•   Commercial invoice
•   specification guide
•   packing list
•   MTC report as per EN 10204 3.1 or 3.2
•   Welding guide

Packaging of flanges-
Stainless Steel 316 Flanges are packed and delivered in the standard packing of wooden cases, cartons, pallets, and plywood boxes that adds protection from damages. Moreover, these flanges are delivered in the form of bundles or in shrink wrap. This ensures none of any flange gets damage while exporting.

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Stainless Steel 316 Flanges Stockists, Stainless Steel 316 Lap Joint Flanges, SS 316 Blind Flanges, 316 SS RTJ Flanges, ASME SA 182 SS 316 Plate Flanges, SUS 316 Flanges Exporter in India.

ASME SA182 316 Stainless Steel Flanges Equivalent Grades

Stainless Steel 316 Flanges Forms in Stock

Stainless Steel 316 Flanges Specifications

Piyush Steel manufactures SS 316 Flanges to internationally recognised standards, covering a full range of sizes, pressure classes, and face types. Non-standard bore diameters, extended hubs, and special facing arrangements are available against customer drawings.

Types of Stainless Steel 316 Flanges

At Piyush Steel, we offer twelve SS 316 flange configurations for process, marine and utility systems. Each type is designed for a specific joint geometry, pressure rating or installation condition.

• SS 316 Slip On Flanges
• SS 316 Weld Neck Flanges
• SS 316 Blind Flanges
• SS 316 Socket Weld Flanges
• SS 316 Threaded Flanges
• SS 316 Lap Joint Flanges
• SS 316 RTJ Flanges
• SS 316 Orifice Flanges
• SS 316 Spectacle Blind Flanges
• SS 316 Long Weld Neck Flanges
• SS 316 Forged Flanges
• SS 316 Plate Flanges

 

ASTM A182 F316 Slip On Flanges

Slip On Flanges are great for process piping applications when installation speed is a consideration and pressure ratings are Class 600 or less. The pipe slides through the bore and receives fillet welds on both sides, eliminating leak paths without precision bore alignment. Material costs run 15–20% lower than equivalent Weld Neck units, making them a practical choice for water treatment headers and general process piping in ASTM A182 F316.

 

ASME SA182 SS 316 Weld Neck Flanges

Weld Neck Flanges carry a long tapered hub that distributes bending stress across the weld joint rather than concentrating it at a single fillet. That geometry makes them standard on high-pressure and high-temperature pipelines. Power generation headers, petrochemical reactor feed lines, and offshore riser connections rely on this design because the tapered hub absorbs thermal cycling and surge loads. Pressure classes run to 2500# in sizes up to 24" from standard stock.

 

Stainless Steel 316 Blind Flanges

Blind Flanges close off pipe ends and vessel nozzles, and bolting them off at maintenance intervals gives interior access without cutting the line. Heat exchanger shells, pressure vessel manways, and inspection branches depend on this feature. RTJ-faced blinds in Class 900 and above compress a metal ring gasket into machined grooves, achieving leak-tight seals at pressures above 100 bar.

 

SS 316 Socket Weld Flanges

Socket Weld Flanges handle small-bore piping from NPS ½" through 3" in services up to Class 2500. The pipe inserts into a machined socket and receives a fillet weld at the hub, eliminating sharp bore transitions and producing smooth flow with minimal turbulence. Chemical processing plants specify them on instrument impulse lines and high-pressure sampling headers where leak-tight integrity is non-negotiable.

 

SS 316 Lap Joint Flanges

Lap Joint Flanges pair with a stub-end to create a rotating assembly, letting the flange ring turn freely for bolt-hole alignment during assembly. This cuts fit-up time significantly on multi-connection spools and suits systems requiring frequent dismantling. Using a lower-grade backing flange with an SS 316 stub-end reduces material cost on non-corrosive services. Piyush Steel supplies matched stub-end and Lap Joint sets to ASME B16.9 standards.

 

Pressure Rating and Temperature Range of Stainless Steel 316 Flanges

ASME B16.5 pressure-temperature ratings govern allowable working pressure for SS 316 flanges at each class. At 38°C, the ratings are as given below.

Allowable pressure drops as temperature rises. Class 150 derates to 8.4 bar at 425°C. Grade 316 maintains oxidation resistance to 870°C (intermittent) and cryogenic service to -196°C without brittle fracture. Gasket and bolt preload selection must consider both temperature range and fluid chemistry.

 

Equivalent Grades of Stainless Steel 316 Flanges

SS 316 has multiple international designations that are used interchangeably on procurement and certification documents.

Chemical Composition of Stainless Steel 316 Flanges

Mechanical Properties of SS 316 / S31600 / 1.4401 / 1.4436 / SUS 316 Flanges

Markings On The Stainless Steel 316 Flanges

The full identification of the flanges should be continuously marked down its whole length, including :

•   Rating Designation
•   Material Designation
•   Melt Designation - as required by specification
•   Grade
•   Identification of Threaded Ends
•   Heat Code
•   Manufacturer's Name or Symbol

Stainless Steel 316 Flanges Application Industries

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