SS 304 / 304L Forged Flanges Manufacturer in India
AstroForge Fitting Industries is a renowned manufacturer and exporter of ASTM A182 SS 304 / 304L Forged Flanges in India.
We offer a comprehensive range of Stainless Steel 304/304L Flanges, including Weld Neck, Slip On, Blind, Socket Weld, Threaded, Lap Joint, and Ring Type Joint (RTJ) Flanges, designed for strength, durability, and excellent corrosion resistance.
These ASTM A182 Grade 304 / 304L Flanges are manufactured using high-grade raw materials under strict quality control and are widely used in petrochemical, power generation, marine, and food processing industries.
Manufacturing Standards
All SS 304 / 304L Flanges are manufactured as per:
ASTM A182 / ASME SA182 (F304 / F304L)
ASME B16.5, B16.47, DIN, BS, and EN standards
ISO 9001:2015 certified production and testing
Available Types of Stainless Steel 304 / 304L Flanges
Slip On Flange (SORF)
Weld Neck Flange (WNRF)
Blind Flange (BLRF)
Socket Weld Flange (SWRF)
Lap Joint Flange (LJFF)
Threaded Flange (THRF)
Ring Type Joint Flange (RTJ)
Reducing & Orifice Flanges
Size Range
½” NB to 48” NB
Pressure Ratings: Class 150, 300, 600, 900, 1500 & 2500
Facing Type: RF / FF / RTJ
Connection Type: Welded / Threaded / Screwed
Description
Flanges are vital pipe components used for connecting pipes, valves, pumps, and other equipment to form a complete piping system.
SS 304 / 304L Forged Flanges are manufactured through the forging process, ensuring superior strength, dimensional accuracy, and resistance to corrosion and pressure.
Our Stainless Steel 304 / 304L Flanges are available in various face types — Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ) — suitable for different industrial applications.
SS 304 vs SS 304L Flanges
SS 304 contains higher carbon (≤ 0.08%) offering high strength and hardness.
SS 304L (Low Carbon) contains ≤ 0.035% carbon, preventing carbide precipitation and ensuring better weldability.
Dimensional Range of ASTM A182 SS 304 / 304L Flanges
| Type | Size (NB) | Pressure Rating | Face Type | Standards |
|---|---|---|---|---|
| Weld Neck (WNRF) | ½” – 48” | 150# – 2500# | RF / RTJ | ASME B16.5 / B16.47 |
| Slip On (SORF) | ½” – 48” | 150# – 2500# | RF / FF | ASME B16.5 |
| Blind (BLRF) | ½” – 48” | 150# – 2500# | RF / RTJ | ASME B16.5 |
| Socket Weld (SWRF) | ½” – 4” | 150# – 2500# | RF | ASME B16.11 |
| Threaded (THRF) | ½” – 4” | 150# – 2500# | FF / RF | ASME B16.11 |
| Lap Joint (LJFF) | ½” – 24” | 150# – 900# | FF | ASME B16.5 |
Chemical Composition of Stainless Steel 304 / 304L Flanges
| Element | 304 (%) | 304L (%) |
|---|---|---|
| Carbon (C) | ≤ 0.08 | ≤ 0.035 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 |
| Chromium (Cr) | 18.00 – 20.00 | 18.00 – 20.00 |
| Nickel (Ni) | 8.00 – 11.00 | 8.00 – 12.00 |
| Nitrogen (N) | ≤ 0.10 | ≤ 0.10 |
| Iron (Fe) | Balance | Balance |
Mechanical & Physical Properties of SS 304 / 304L Flanges
| Property | 304 | 304L |
|---|---|---|
| Tensile Strength (MPa) | 515 min | 485 min |
| Yield Strength (MPa) | 205 min | 170 min |
| Elongation (%) | 40 min | 40 min |
| Hardness (Brinell) | ≤ 201 | ≤ 201 |
| Density | 8.0 g/cm³ | 8.0 g/cm³ |
Heat Resistance
SS 304 flanges resist oxidation up to 870°C in intermittent and 925°C in continuous service.
SS 304L provides better resistance to intergranular corrosion after welding or stress-relief treatment.
Solution Treatment:
Annealing at 1050°C followed by water quenching is recommended for restoring corrosion resistance after fabrication.
Weldability
SS 304 and 304L flanges can be welded by all standard methods, including TIG, MIG, and Arc welding, with or without filler metal.
Post-weld annealing is not necessary for SS 304L due to its low carbon content.
Applications of SS 304 / 304L Forged Flanges
Oil & Gas Pipeline Systems
Petrochemical and Refinery Equipment
Power Generation & Heat Exchangers
Marine & Offshore Structures
Food & Beverage Processing Units
Water Treatment & Sewage Systems
Pulp & Paper Industry
Quality Assurance & Testing
Each Stainless Steel 304 / 304L Flange is subjected to:
Visual & Dimensional Inspection
Ultrasonic & Radiographic Testing
Hydrostatic Pressure Testing
PMI (Positive Material Identification)
Mechanical & Chemical Analysis
Intergranular Corrosion (IGC) Test
Third-Party Inspection Reports (TPI)
All flanges are supplied with EN 10204/3.1B Mill Test Certificates, ensuring traceability and compliance with international standards.
Packaging & Marking
Flanges are protected with plastic end caps
Wrapped in bubble wrap or HDPE sheets
Packed in fumigated wooden crates or pallets
Each flange is marked with Grade, Size, Heat No., and Country of Origin
Why Choose AstroForge Fitting Industries
ISO 9001:2015 Certified Company
State-of-the-art Manufacturing Facilities
Custom Flanges per Client Drawings & Specifications
Competitive Pricing with Timely Delivery
Exporter to 40+ Countries Worldwide
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Explore moreFAQs - SS 316/316L Forged Flanges
SS 316/316L Forged Flanges are high-quality stainless steel flanges made from grade 316 or 316L through the forging process. They offer excellent corrosion resistance, high tensile strength, and durability, suitable for critical piping applications.
The main difference lies in carbon content: 316L has lower carbon, making it ideal for welding and reducing carbide precipitation. Both offer superior corrosion resistance, but 316L is preferred in high-temperature and corrosive environments.
ommon types include:
Weld Neck Flanges (WN)
Slip-On Flanges (SO)
Socket Weld Flanges (SW)
Blind Flanges (BL)
Threaded Flanges (TH)
Lap Joint Flanges (LJ)
They are manufactured according to standards like ASTM A182, ASME B16.5, ASME B16.47, and EN 1092, ensuring high quality and international compliance.
Used extensively in chemical processing, oil & gas, petrochemical, marine, pharmaceutical, and food industries due to their excellent resistance to chloride corrosion and high-temperature environments.
Forged flanges offer superior mechanical strength, uniformity, and resistance to high pressure and temperature compared to cast or welded flanges, making them suitable for critical industrial pipelines.
SS 316/316L Forged Flanges are available in sizes ranging from ½ inch to 48 inches and in pressure classes 150#, 300#, 600#, 900#, 1500#, and 2500#, with custom sizes on request.
The presence of molybdenum in the alloy enhances resistance to pitting and crevice corrosion, especially in chloride-rich environments.
Yes, both 316 and 316L flanges are suitable for welding. 316L is particularly ideal due to its low carbon content, which minimizes the risk of carbide precipitation and weld decay.
Regular cleaning with mild detergents, avoiding harsh chemicals, and periodic inspection for corrosion or wear can prolong the service life. Passivation is recommended for critical applications.