Stainless Steel 304L Flanges Stainless Steel 304L Socket Weld Flanges SS 304L Slip on Flanges

Other Availability Stainless Steel Grades Flanges - In stock

SS 304 Flanges SS 304H Flanges SS 310 / 310S Flanges SS 316 / 316L Flanges SS 317L Flanges SS 316TI Flanges SS 321 / 321H Flanges SS 347 / 347H Flanges SS 904L Flanges

SS 304L Ring Type Joint - RTJ Flanges, Stainless Steel 304L Blind Flanges, Stainless Steel 304L Long Weld Neck Flanges, A182 F304L Flanges, SS 304L Slip On Flanges, SS 304L Weld Neck Flanges in India.

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ASTM A182 SS 304L Pipe Flanges, Stainless Steel 304L Threaded Flanges, SS 304L Spectacle Blind Flanges, 304L Stainless Steel Lap Joint Flanges, Stainless Steel 304L Socket Weld Flange, Stainless Steel 304L SORF Flanges, SS 304L Plate Flanges, SS 304L Flanges Manufacturers in India

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304L Stainless Steel Flanges

Seamac Piping Solutions Inc. is a producer and supplier of different types of Flanges. Stainless Steel 304L Flanges are one of the Flanges available in our inventory. We are offering many kinds of Flanges as per the requirements of industries. By following all national and international standards, we are manufacturing high-quality Flanges. As a leading and customer-focused manufacturer, we are supplying perfectly suitable Flanges.

Stainless Steel 304L Flanges is Chromium and Nickel Austenitic Flanges, which is the most suitable type of Flange for critical industrial applications. This type of Flange has many beneficial features like excellent resistance to intergranular corrosion attacks, atmospheric corrosion, oxidizing, toughness, and strength. It has all the necessary mechanical properties, which make it suitable for many applications. These Flanges are easy to fabricate, assemble, and maintenance.

Seamac Piping Solutions Inc. carries a wide range of stainless steel 304L flanges in a variety of lengths, ODs, IDs, size and wall thicknesses to meet your project’s needs—including flanges in dimension as per ASTM , ASME B16.5, B16.47, B16.48 and weight-kg. per mtr. weight & thickness of 304L stainless steel flanges .

We offer Stainless Steel 304L Flanges in all standards, types, sizes, dimensions, and specifications. With a wide variety of Flanges, we aim to help industries by supplying suitable Flanges. We understand the importance of accuracy in every product, and hence, we are using all the necessary machinery and methods to produce these Flanges. We are updating our production process by adopting the newest technology and machines. Our skilled professionals are strictly following all norms and supervise the whole process to get a high-quality outcome.

The quality assurance program and guidance of experts are the main reasons behind customer satisfaction. Seamac Piping Solutions Inc. aims to contribute to making every critical industrial application smoother and efficient. Hence, we test and check every Flange many times before sending it for final delivery. Our experts are rigorously following quality testing norms and deliver the most precise and durable Flanges. By performing destructive and non-destructive tests, we ensure quality, hardness, performance, and finishing of Flanges.

Stainless Steel 304L Flanges Specifications

Specification : ASTM A182 / ASME SA182

Dimension Standard : ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.

Standard : ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.

Size : 1/2" (15 NB) to 48" (1200NB)

Class / Pressure : 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.

Flange Face Type : Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)

DIN Flanges : DIN 2527, 2566, 2573, 2576, 2641,2642, 2655, 2656, 2627, 2628, 2629, 2631, 2632, 2633, 2634, 2635, 2636, 2637,2638, 2673.

JIS Flanges : JIS B2220 5K, JIS B2220 10K, JIS B2220 16K, JIS B2220 20K

BS Flanges : BS4504 PN 6, BS 4504 PN 10, BS4504 PN 16, BS4504 PN 25, BS4504 PN 40, BS 4504 PN 64, BS 4504 PN 100, BS 4504 PN 160, BS 4504 PN 250, BS 10, BS Table D, BS Table E, BS Table F, BS Table H.

ASME SA182 Stainless Steel 304L Flanges Equivalent Grades

STANDARD WERKSTOFF NR. UNS JIS BS GOST AFNOR EN
SS 304L 1.4306 / 1.4307 S30403 SUS 304L 3304S11 03Х18Н11 Z3CN18‐10 X2CrNi18-9 / X2CrNi19-11

Along with quality assurance, we are also taking care of the delivery of orders. We ensure convenient doorstep service by proper packing and shipping. By using quality material like wooden boxes, crates, wrap to pack, we deliver damage-free Flanges at the client’s location. With the help of fast shipping way and logistic partners, we provide on-time service. At affordable rates, we are offering a satisfying solution to our clients.


Stainless Steel 304L Flanges Types

SS 304L Slip On Flanges

SS 304L SORF Flanges

ASTM A182 SS 304L Slip On Flanges

UNS S30403 Slip on Flange

SS 1.4306 / 1.4307 Slip On Flange

SS F304L Slip On Flange

SS 304L Weld Neck Flanges

SS 304L Weld Neck Flanges

ASTM A182 F304L Weld Neck Flanges

SS 304L WNRF Flanges

UNS S30403 Weld Neck Flanges

SS 1.4306 / 1.4307 Weld Neck Flanges

SS 304L Blind Flanges

Stainless Steel 304L Blind Flange

ASTM A182 SS 304L Blind Flanges

UNS S30403 Blind Flange

SS 304L Blind Flanges

SS 1.4306 / 1.4307 BLRF Flanges

SS 304L Threaded Flanges

Stainless Steel 304L Threaded Flanges

ASTM A182 SS 304L Threaded Flanges

UNS S30403 Threaded Flanges

SS 304L Threaded Flanges

SS 1.4306 / 1.4307 Threaded Flanges

SS 304L Socket weld Flange

Stainless Steel 304L Socket weld Flange

ASTM A182 SS 304L SWRF Flanges

UNS S30403 Socket weld Flange

SS 304L Socket weld Flange

SS 1.4306 / 1.4307 Socket weld Flange

SS 304L Lap Joint Flanges

Stainless Steel 304L Lap Joint Flanges

ASTM A182 SS 304L Lap Joint Flanges

UNS S30403 Lap Joint Flanges

SS 304L Lap Joint Flanges

SS 1.4306 / 1.4307 Lap Joint Flanges

SS 304L Ring Type Joint Flange

Stainless Steel 304L Ring Type Joint Flange

ASTM A182 SS 304L Ring Type Joint Flange

UNS S30403 Ring Type Joint Flange

SS F304L RTJ Flanges

SS 1.4306 / 1.4307 Ring Type Joint Flange

SS 304L Orifice Flange

Stainless Steel 304L Orifice Flanges

ASTM A182 SS 304L Orifice Flanges

UNS S30403 Orifice Flanges

SS F304L Orifice Flanges

SS 1.4306 / 1.4307 Orifice Flange

SS 304L Long Weld Neck Flanges

Stainless Steel 304L Long Weld Neck Flanges

ASTM A182 SS 304L Long Weld Neck Flanges

UNS S30403 Long Weld Neck Flanges

SS 304L Long Weld Neck Flanges

SS 1.4306 / 1.4307 Long Weld Neck Flanges

SS 304L Spectacle Blind Flanges

Stainless Steel 304L Spectacle Blind Flanges

ASTM A182 SS 304L Spectacle Blind Flange

UNS S30403 Spectacle Blind Flange

SS F304L Spectacle Blind Flange

SS 1.4306 / 1.4307 Spectacle Blind Flange

SS 304L Forged Flanges

Stainless Steel 304L Forged Flanges

ASTM A182 SS 304L Forged Flanges

UNS S30403 Forged Flanges

SS F304L Forged Flanges

SS 1.4306 / 1.4307 Forged Flanges

SS 304L Plate Flanges

Stainless Steel 304L Plate Flanges

ASTM A182 SS 304L Plate Flange

UNS S30403 Plate Flanges

SS F304L Plate Flange

SS 1.4306 / 1.4307 Plate Flanges

Stainless Steel 304L Flanges Sizes in Stock:

All Flanges is manufactured and tested / inspected to the relevant standards including ASTM, ASME and API etc.

Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS4087 Flanges PN14 Flanges 95 67 4 M12 14
AS 2129 Flange Table C Flanges 95 67 4 13 14
Table D Flanges 95 67 4 13 14
Table E Flanges 95 67 4 13 14
Table F Flanges 95 67 4 13 14
Table H Flanges 114 83 4 16 17
Table J Flanges 114 83 4 16 17
ANSI B16.5 Flanges ANSI 150 Flanges 89 60 4 13 16
ANSI 300 Flanges 95 67 4 13 16
ANSI 600 Flanges 95 67 4 13 16
ANSI 900 Flanges 121 83 4 19 22
ANSI 1500 Flanges 121 83 4 19 22
ISO 7005 (DIN) Flange PN6 Flanges 80 55 4 M10 11
PN10 Flanges 95 65 4 M12 14
PN16 Flanges 95 65 4 M12 14
PN20 Flanges 90 60.5 4 M14 16
PN25 Flanges 95 65 4 M12 14
PN40 Flanges 95 65 4 M12 14

Chemical Composition of Stainless Steel 304L Flanges

Grade C Mn Si P S Cr Mo Ni N
SS 304L 0.035 max 2 max 1.0 max 0.045 max 0.030 max 18 – 20 - 8 – 13 -

Mechanical Properties of SS 304L Flanges

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
8.0 g/cm3 1400 °C (2550 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %

Advantages of SS 304L Over SS 304 Flanges

The difference between the two grades is the carbon content. SS 304 L is limited to 0.03 % max Carbon content, and SS 304 is 0.08 %. This small difference in structure makes a big difference to the way the metal behaves when heated.

When you weld standard 304, chromium carbides form at the grain boundaries, leaving the area vulnerable to localized corrosion. SS 304L eliminates this issue. It allows significant welding without post-weld annealing, thus saving time and labour cost in field installation. When heavy welding or exposure to high temperatures is a factor, 304L is preferred over standard 304 because it will not suffer intergranular cracking and loss of structural integrity. Standard 304 has slightly higher mechanical strength at room temperature.

Property / Feature SS 304 Flanges SS 304L Flanges
Carbon Content Maximum 0.08% Maximum 0.03%
Weldability Good, but prone to carbide precipitation Excellent, resists carbide precipitation
Corrosion Resistance Standard; vulnerable in heat-affected zones Higher resistance after welding operations
Application Suitability General utility, structural, low-weld setups Heavy welding, corrosive fluids, high heat

Pressure Rating & Temperature Range of SS 304L Flanges

Piping systems operate under varied structural loads. These flanges are available in different pressure classes at Seamac Piping to cater to specific line requirements. Standard ASME ratings are 150#, 300#, 600#, 900#, 1500# and 2500#. For metric systems, EN/DIN specifications are available from PN6 up to PN250.

The allowable working pressure drops as the operating temperature rises. SS 304L performs reliably from cryogenic temperatures up to approximately 800°F (426°C). At carbon contents below this range, its creep strength is reduced compared to standard 304 or stabilised grades such as 321. It is still very effective for the moderate to high temperature environments found in utility lines.

Standard / Class Nominal Pressure Ratings
ASME / ANSI B16.5 Class 150, 300, 400, 600, 900, 1500, 2500
EN 1092-1 / DIN PN6, PN10, PN16, PN25, PN40, PN64, PN100, PN160, PN250

Why Choose Our Stainless Steel 304L Flanges?

Seamac Piping manufactures and supplies flanges as per ASTM A182 and ASME SA182. Our raw materials are purchased from certified mills to ensure the chemical composition of 304L is within the required limits. All batches undergo rigorous quality control checks such as hydrostatic testing, ultrasonic inspection, and macro analysis prior to dispatch.

We stock a large range of standard sizes, slip-on, weld neck, and blind flanges at our facility in India. This enables us to process domestic and international orders quickly. Special faces & custom dimensions to your drawings. We export regularly to the USA, UK, UAE and Europe, all in heavy duty seaworthy packaging to prevent any damage in transit.

application industry

Applications of Stainless Steel 304L Flanges

  • Chemical Industry
  • Petrochemical industry
  • Marine & Power Transmission industry
  • Power plants
  • Energy industries
  • Furniture
  • Pharmaceutical processing industry
  • Modern architecture
  • Home appliances
  • Water waste projects
  • Synthetic fiber
  • Heat exchanger
  • Fluid piping
  • Dairy and food processing

Frequently Asked Questions

What is the difference between SS 304 and SS 304L flanges?

SS 304L has a lower carbon content, maximum 0.03%, which prevents carbide precipitation during welding, unlike standard 304 which contains more carbon.

Yes, they are corrosion resistant to atmosphere, organic chemicals and sterile solutions. The low carbon content protects the welded joints against the localised intergranular attack.

They are used in petrochemicals, oil and gas, food processing, pharmaceuticals, wastewater treatment, power generation, and chemical manufacturing sectors.

We supply them in ASME classes from 150# to 2500#, and European metric ratings from PN6 to PN250.

Yes, we machine custom thicknesses, non-standard diameters, and specific face finishes based on your engineering drawings and project requirements.

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