SS 316 / 316L Forged Flanges Manufacturer in India
AstroForge Fitting Industries is a trusted and leading manufacturer and exporter of ASTM A182 SS 316 / 316L Forged Flanges in India.
Our Stainless Steel 316/316L Forged Flanges are known for their excellent corrosion resistance, high-temperature strength, and outstanding durability, making them ideal for demanding industrial applications.
We manufacture a complete range of Stainless Steel 316 / 316L Flanges, including Weld Neck, Slip On, Blind, Socket Weld, Threaded, Lap Joint, RTJ, Reducing, and Orifice Flanges, available in multiple pressure ratings and customized dimensions.
Manufacturing Standards
All SS 316 / 316L Forged Flanges are manufactured as per:
ASTM A182 / ASME SA182 (F316 / F316L)
ASME B16.5, ASME B16.47, DIN, BS & EN standards
ISO 9001:2015 certified production & testing
Available Types of Stainless Steel 316 / 316L 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 Flanges
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
SS 316 / 316L Forged Flanges are essential components used for connecting pipes, pumps, valves, and industrial equipment.
These flanges are manufactured through a high-strength forging process, ensuring:
Superior mechanical strength
Excellent resistance to corrosion, pitting & crevice corrosion
High dimensional accuracy
Long service life in harsh environments
Stainless Steel 316 / 316L Flanges are available in Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ) face types and are widely used in industries where high corrosion resistance is critical.
SS 316 vs SS 316L Flanges
SS 316: Contains higher carbon (≤ 0.08%); offers enhanced strength and heat resistance.
SS 316L: Low carbon (≤ 0.035%), making it suitable for welding applications without risk of carbide precipitation or intergranular corrosion.
Dimensional Range of ASTM A182 SS 316 / 316L 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 316 / 316L Flanges
| Element | 316 (%) | 316L (%) |
|---|---|---|
| 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) | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel (Ni) | 10.0 – 14.0 | 10.0 – 14.0 |
| Molybdenum (Mo) | 2.0 – 3.0 | 2.0 – 3.0 |
| Nitrogen (N) | ≤ 0.10 | ≤ 0.10 |
| Iron (Fe) | Balance | Balance |
Mechanical & Physical Properties of SS 316 / 316L Flanges
| Property | 316 | 316L |
|---|---|---|
| Tensile Strength (MPa) | 515 min | 485 min |
| Yield Strength (MPa) | 205 min | 170 min |
| Elongation (%) | 40 min | 40 min |
| Hardness (Brinell) | ≤ 217 | ≤ 217 |
| Density | 8.0 g/cm³ | 8.0 g/cm³ |
Heat Resistance
SS 316 has excellent oxidation resistance up to 870°C in intermittent service and 925°C in continuous service.
SS 316L provides superior resistance to sensitization during welding and thermal processing.
Solution Treatment:
Annealing at 1010°C – 1120°C followed by rapid cooling improves corrosion resistance.
Weldability
Both SS 316 and SS 316L flanges can be welded using:
TIG
MIG
Arc welding
SS 316L does not require post-weld annealing, making it ideal for welded equipment and piping systems.
Applications of SS 316 / 316L Forged Flanges
Oil & Gas Pipelines
Chemical & Petrochemical Equipment
Marine & Offshore Structures
Desalination Plants
Food & Beverage Processing
Pharmaceutical & Biotech Industries
Heat Exchangers & Pressure Vessels
Water Treatment & Sewage Plants
Quality Assurance & Testing
Each SS 316 / 316L Flange undergoes:
Visual & Dimensional Inspection
PMI Testing
Ultrasonic & Radiography Test
Mechanical Testing
Intergranular Corrosion Test (IGC)
Hydrostatic Pressure Test
Chemical Analysis
Third-Party Inspection (TPI)
All flanges come with EN 10204 3.1 Mill Test Certificates.
Packaging & Marking
Plastic end caps for protection
Bubble wrap / HDPE packaging
Fumigated wooden boxes & pallets
Marking includes: Grade, Size, Pressure Class, Heat No., Country of Origin
Why Choose AstroForge Fitting Industries
ISO 9001:2015 Certified Company
Advanced Forging & CNC Machining Facilities
Custom-Made Flanges as per Drawings
Competitive Pricing with Fast Delivery
Exporting to 40+ Countries Worldwide
Strict Quality Control & Testing
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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.