ISO 9001:2015 Certified · CRISIL Rated · PED Certified · Trusted Global Exporter
AISI 309 Stainlesss Steel Pipe Flange Supplier

Siddhagiri Metals and Tubes is a recognized supplier of Stainless Steel 309 Flanges. We have an experience of more than 20 years.
Other Names: ASTM A182 F309, ASTM A182 F309, Stainlesss Steel Flanges, 309 SS Pipe Flanges, SS 309 Flanges
Material: SS309, AISI 309, SUS309, INOX 309, Stainlesss Steel 309
Brand: Siddhagiri Metals and Tubes
Manufacturer: Siddhagiri Metals and Tubes
Rating: 4.2/5 based on 90 customer reviews

AISI 309 Stainlesss Steel Pipe Flanges Supplier • ASTM A182 F309 • Stainlesss Steel Flanges · UNS S30900 Flanges

Stainless Steel 309 Flanges of premium quality is supplied by Siddhagiri Metals and Tubes as per ASTM A182 TP309. We also provide value-added services to meet your unique needs, including custom-lengths, cut and strip, custom labels, striping, printing, and more. We take pride in personal customer service, starting with a real person answering your calls and an individual representative working with you one-on-one to meet your pricing and delivery needs. Our entire range of product is tested on various parameters in order to deliver best quality output.

A flange joint is a connection of pipes, where the connecting pieces have flanges by which the parts are bolted together. The principle of a flange is to apply a mechanical force by using bolts to preload the gasket until contact stress between flanges and gasket is sufficient to maintain a seal. Connection to the pipe is by welding or threading. To allow easy functionality and inter-changeability, these ASTM A182 Flanges are designed to have standardised dimensions which include ANSI, ASME, DIN, EN, BS, JIS. Flanges have major applications in Oil, Gas, Petrochemical, Ship-Building, Marine, Food, Dairy, Railways and other associated industries were piping systems are required.

Stainlesss Steel Slip On Flange — Stainless Steel Slip-On Flanges is slightly larger than the outer diameter of the pipe it is to be used with. The pipe is slipped into the Flange prior to welding both inside and outside. We supply a wide range of slip-On Flanges in different dimensions and sizes. SS 309 Slip On Flange and Stainlesss Steel Slip On Flange is in ready stock with Siddhagiri Metals and Tubes.

Stainlesss Steel Blind Flange — Stainless Flange with no borehole are known as Blind Flange and used to close the end of the pipe. Blind Flanges are supplied as threaded or welded from class 150lb to 2500lb. SS 309 Blind Flange and Stainlesss Steel Blind Flange is in ready stock with Siddhagiri Metals and Tubes.

Stainlesss Steel Weld Neck Flange — Stainless Weld Neck Flanges are widely used in high-pressure piping systems and can be easily recognised by the long tapered hub. The size of the bore hole is usually equal to the size of the pipe. SS 309 Weld Neck Flange and Stainlesss Steel Weld Neck Flange is in ready stock with Siddhagiri Metals and Tubes.

Stainlesss Steel Socket Weld Flange — Initially developed for small high-pressure piping systems a Socket Weld Flange is similar to Slip On Flange. The flange is installed by welding around the hub of the flange. SS 309 Socket Weld Flange and Stainlesss Steel Socket Weld Flange is in ready stock with Siddhagiri Metals and Tubes.

Stainlesss Steel Threaded Flange — Threaded Flanges are used for special application where the flange can be assembled to the piping system by without welding. We specialise in all forms of threaded flanges and can supply it in multiple size range. SS 309 Threaded Flange and Stainlesss Steel Threaded Flange is in ready stock with Siddhagiri Metals and Tubes.

Stainlesss Steel Lap Joint Flange — Lap-Joint Flanges are similar to Slip-On flanges and are generally used with Lap-Joint Stubs. This type of flange is highly used where the piping systems are disassembled from time to time. SS 309 Lap Joint Flange and Stainlesss Steel Lap Joint Flange is in ready stock with Siddhagiri Metals and Tubes.

Siddhagiri Metals and Tubes supplies Stainlesss Steel Flanges in different sizes and pressure ratings. Our production stock of Stainlesss Steel Flanges includes size range from 1/2” to 24”, 26” to 60”, 1” to 24”, 1/2” to 24”, 12” to 60”, 26” to 48”, 21/16” to 30”, DN10 to DN3600. We have an inventory of flanges rating from Class 150 to 2500 Lbs, Class 300 to 2500 Lbs, Class 150 to 2500 Lbs, Class 150 to 900 Lbs, Class 150 to 600 Lbs, 2000 Psi to 20000 Psi, PN6 to PN 160. Our flanges conform to international dimension standards such as ASME / ANSI B16.5, ASME B16.47 / API 605, ASME / ANSI B16.36, ASME B16.48 / API 590, MSS-SP-44, BS 3293, API 6A and DIN. We stock various types of flanges which include Slip On Flange, Blind Flange, Weld Neck Flange, Socket Weld Flange, Threaded Flange, Lap Joint Flange.

Siddhagiri Metals and Tubes have an extensive inventory of multiple stainless steel flanges and alloy flanges to compliment our pipe products. Most of our high quality, flanges and gasket kits are ready to ship upon request. Speak to one of our specialists and find out which flanges to meet your flange and piping specifications. We have partnered with the best flange brands around the world to meet your flange requirements. We also stock flanges from Ulma — Spain, Metalfar — Italy, Mellesi — Italy, Massoti — Italy. Moreover, we are SAUDI ARAMCO approved supplier of flanges and provide all documents including Mill Certificate along with the shipment.

Our primary export destinations include Russia, Australia, UK, Germany, US, Saudi Arabia, Qatar, Jordan, South Africa, Thailand, Canada, Mexico, Brazil and much more.

  • Flange Specification: ASTM A182 F309, EN 1.4828
  • Dimension Standard: ASME / ANSI B16.5, ASME B16.47 / API 605, ASME B16.48 / API 590, MSS-SP-44, BS 3293, API 6A, DIN DN10 to DN3600
  • Size Range: 1/2” to 24”
  • Rating: Class 150 to 2500 Flanges | PN 6, PN 10, PN 16, PN 25, PN 40, PN 64 upto PN 160
  • Type of Flanges: Stainlesss Steel Weld-Neck Flanges, Stainlesss Steel Socket-Weld Flange, Stainlesss Steel Lap-Joint Flange, Stainlesss Steel Orifice Flange, Stainlesss Steel Tongue-Grove Flange, Stainlesss Steel Blind Flange, Stainlesss Steel Threaded Flange, Stainlesss Steel Slip-On Flange, Stainlesss Steel Spectacle Flange, Stainlesss Steel Plate Flanges
  • Form: SORF, BLRF, WNRF, SWRF, LJRF, LWNRF, RTJ, Flat Face, Ring Type, Raised Face
  • Origin: Indian Origin, European Origin, Japanese Origin
  • Testing and Documents: Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, Destructive Test Report, Non Destructive Test Reports, PMI Test Reports, Visual Inspection Reports, Third Party Inspection Reports, NABL Approved Lab Reports
  • Packing: Packed in Wooden Boxes, Bubble wraps, Steel Strips Bundled, or as per Customers Requests

AISI 309 Flanges in Stock

Dimension Standard Size Range Rating
ASME / ANSI B16.5 Flanges 1/2” to 24” Class 150 to 2500 Lbs
ASME B16.47 / API 605 Flanges 26” to 60” -
ASME / ANSI B16.36 Flanges 1” to 24” Class 300 to 2500 Lbs
ASME B16.48 / API 590 Flanges 1/2” to 24” Class 150 to 2500 Lbs
MSS-SP-44 Flanges 12” to 60” Class 150 to 900 Lbs
BS 3293 Flanges 26” to 48” Class 150 to 600 Lbs
API 6A Flanges 2 1/16” to 30” 2000 Psi to 20000 Psi
DIN Flanges DN10 to DN3600 PN6 to PN 160

Forms of SS309 Flanges with ASTM A182 F309 in Stock

In Stock Stainlesss Steel Weld Neck Flanges Manufacturer

SS 309 Weld Neck Flange

309SS Weld Neck Flange available from class 150 to 2500

In Stock Stainlesss Steel Tongue Groove Flanges Manufacturer

SS 309 Tongue Groove Flange

309SS Tongue Groove Flanges available from PN6 to PN 160 ratings

In Stock Stainlesss Steel Threaded Flanges with ASME B16.5 and ANSI B16.5 Manufacturer

SS 309 Threaded Flange

309SS Threaded Flange available in ASME / ANSI B16.5 standards

In Stock Stainlesss Steel Spectacle Flanges Manufacturer

SS 309 Spectacle Flange

309SS Spectacle Flange with ASTM A182

In Stock Stainlesss Steel Socket Weld Flanges Manufacturer

SS 309 Socket Weld Flange

309SS Socket Weld Flangewith ASTM A182

In Stock Stainlesss Steel Slip On Flanges Manufacturer

SS 309 Slip On Flange

309SS Slip On Flange ASTM A182

In Stock Stainlesss Steel Orifice Flanges Manufacturer

SS 309 Orifice Flange

309SS Orifice Flange available from PN6 to PN 160 ratings

In Stock Stainlesss Steel Lap Joint Flanges with ASME B16.36 Manufacturer

SS 309 Lap Joint Flange

309SS Lap Joint Flange available in ASME B16.36 and ANSI B16.36 ASTM A182 Flanges

In Stock Stainlesss Steel Blind Flanges Manufacturer

SS 309 Blind Flange

309SS Blind Flange available from class 150 to 2500LB

  • Chemical Properties
  • Mechanical Properties
  • Physical Properties
  • C Ni Mn P S Si Cr
    MIN - - - - - - -
    MAX 0.200 14.000 2.000 0.045 0.030 1.000 23.000
  • Yield Strength
    0.2% Proof
    Tensile strength
    (% in 50mm)
    MIN 310 620 45.00  
    MAX       85
  • Density lb/in³ 0.285
    Melting Range °F 2650
    °C 1455

Properties of AISI 309 Stainlesss Steel

309 SS Cold Forming

The alloy is quite ductile and forms in a manner very similar to 316. Cold forming of pieces with long-term exposure to high temperatures is not recommended since the alloy is subject to carbide precipitation and sigma phase precipitants.

309 SS Hot Forming

Heat uniformly at 1742 – 2192°F (950 – 1200°C). After hot forming a final anneal at 1832 – 2101°F (1000 – 1150°C) followed by rapid quenching is recommended.

309 SS Welding

Alloy 309 can be readily welded by most standard processes including TIG, PLASMA, MIG, SMAW, SAW and FCAW.

Services We Offer


Documentation is a very important part of the products we supply, and we work continuously to enhance the efficiency of the document-handling process without compromising quality of the product. Documents provided along with the shipment include Certificate of Origin, Material Test Certificate as per EN 10204 3.1 and 10204 3.2, NACE MR10103 and NACE MR0175 certified Test Certificates.

Quality Assurance

Stainlesss Steel Flanges and Fittings are manufactured and controlled to international standards such as ASTM, ASME, BS, MSS, EN, DIN or WERKSTOFFE. Our products undergo stringent quality tests before they are dispatched.

Material Testing

PMI Testing, Ultrasonic Test, Mechanical Testing, Spectro Tests for Chemical Analysis of the grade, Flaring Test, IGC, etc. are some of the tests conducted at our facility. We welcome stage wise inspection from any of your representative or third party inspection agencies.

Packing and Delivery

The product is wrapped and packed in wooden crates or carton boxes. Our primary goal is to deliver quality products in time, no matter where the client is located.

Let Us Know What YOU Need

We Cherish All Your Requirements