When your project involves extreme heat, high pressure, and continuous thermal cycles, choosing the right flange material is critical. Stainless Steel 309H Flanges are specifically engineered for high- temperature service, offering excellent oxidation resistance, improved creep strength, and long-term structural stability.
We are a trusted ASTM A182 F309H Stainless Steel Flanges Manufacturer, Supplier, and Stockists in India, delivering precision-forged components for refineries, power plants, petrochemical facilities, and heavy engineering industries. Our inventory includes a complete range of SS 309H FLANGES, including weld neck, socket weld, threaded, blind, and raised face types — all manufactured to global standards.
What Are Stainless Steel 309H Flanges?
Stainless Steel 309H Pipe Flanges are forged connection components used to join pipes, valves, pumps, and pressure equipment. Grade 309H is a high-carbon version of 309 stainless steel. The “H” indicates higher carbon content, which enhances creep resistance and strength at elevated temperatures.
The material designation UNS S30909 Flange ensures international traceability and compliance. These flanges are commonly produced under ASTM A182 Stainless Steel 309H Flanges specification for high-temperature applications.
Because of their chromium (22–24%) and nickel (12–15%) content, 309H flanges resist oxidation and scaling at temperatures up to approximately 1093°C (2000°F).
Types of SS 309H FLANGES We Supply
We stock and manufacture a wide range of 309h - Stainless Steel Forged Flanges suitable for different pressure and installation requirements.
➤ SS 309H Weld Neck Flanges
SS 309H Weld Neck Flanges are ideal for high-pressure and high-temperature pipelines. Their long tapered hub provides smooth stress distribution and strong butt-weld connections.
➤ SS 309H Socket weld Flanges
Designed for small-diameter pipelines, SS 309H Socket weld Flanges provide strong and leak-proof joints. They are widely used in high-pressure steam lines.
➤ 309H SS Threaded Flanges Stockist
We are a reliable 309H SS Threaded Flanges Stockist, supplying flanges that can be screwed onto pipes without welding. These are commonly used in low-pressure and non-critical systems.
➤ Stainless Steel 309H Raised Face Flanges
Stainless Steel 309H Raised Face Flanges are the most commonly used type. The raised surface improves gasket compression and sealing efficiency.
➤ 309H SS Blind Flanges
309H SS Blind Flanges are used to seal the ends of piping systems or pressure vessels. They are frequently used for testing and maintenance purposes.
➤ SS 309H Forged Flanges
Our SS 309H Forged Flanges are produced through controlled forging processes to refine grain structure and improve mechanical strength.
Industrial Applications of Stainless Steel 309H Pipe Flanges
Due to their heat resistance and strength, these flanges are widely used in:
- Oil & Gas Refineries
- Petrochemical Plants
- Thermal Power Plants
- Boilers & Heat Exchangers
- Furnace Components
- Chemical Processing Units
- High-Temperature Steam Systems
As a trusted 309h Flanges Supplier in Mumbai, India, we have supplied these flanges for critical projects where performance and reliability are non-negotiable.
ASTM B21 Naval Brass C46400 Fittings – Standard & Specification
As an experienced Stainless Steel 309H Flanges Supplier, we ensure strict compliance with ASTM, ASME, and international dimensional standards.
| Specification | Details |
|---|---|
| Product Name | Stainless Steel 309H Flanges |
| Material Grade | 309H Stainless Steel |
| UNS Number | S30909 |
| Standard | ASTM A182 F309H |
| Flange Types | Weld Neck, Blind, Socket Weld, Threaded, Slip-On, Lap Joint |
| Pressure Class | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Size Range | ½” NB to 48” NB |
| Facing Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Manufacturing Process | Forged & Machined |
| Heat Treatment | Solution Annealed |
| Testing | PMI, UT, Hydro Test, Hardness, Third-Party Inspection |
| Documentation | EN 10204 3.1 MTC |
Mechanical Properties of ASTM A182 F309H Flange
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 217 HB |
These values ensure reliable performance of Stainless Steel 309H Flanges in demanding industrial environments.
Chemical Composition of UNS S30909 Flange
The chemical composition directly impacts heat resistance and durability. As an experienced ASTM A182 F309H Stainless Steel Flanges Manufacturer, we ensure strict control of alloying elements.
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 22.0 – 24.0 |
| Nickel (Ni) | 12.0 – 15.0 |
| Carbon (C) | 0.04 – 0.10 |
| Manganese (Mn) | Max 2.0 |
| Silicon (Si) | Max 1.0 |
| Phosphorus (P) | Max 0.045 |
| Sulfur (S) | Max 0.030 |
| Iron (Fe) | Balance |
Why Choose Stainless Steel 309H Flanges?
- Excellent High-Temperature Resistance: With enhanced carbon content, ASTM A182 F309H Flange performs exceptionally well in continuous high-heat conditions.
- Superior Oxidation & Scaling Resistance: The high chromium and nickel content protects the material against oxidation.
- Strong Mechanical Performance: Forged construction enhances durability and reduces the risk of failure under stress.
- Reliable Sealing Performance: Products like Stainless Steel 309H Raised Face Flanges and 309H SS Blind Flanges ensure secure gasket seating and leak-proof connections.
- Long Service Life: Reduced maintenance and downtime make them cost-effective in the long term.
Stainless Steel 309H Flanges Manufacturer & Supplier in India
As one of the reliable Stainless Steel 309H Flanges Manufacturers & Suppliers, we maintain ready stock to support urgent project requirements.
We are recognized as a dependable ASTM A182 F309H Stainless Steel Flanges Manufacturer, Supplier, and Stockists in India, offering competitive pricing and fast delivery across domestic and export markets.
Our stock includes:
- SS 309H Weld Neck Flanges
- SS 309H Socket weld Flanges
- 309H SS Threaded Flanges Stockist range
- 309H SS Blind Flanges
- Stainless Steel 309H Raised Face Flanges
- Complete range of SS 309H Forged Flanges
Trusted Stainless Steel 309H Flanges Supplier in India
For high-temperature and high-pressure piping systems, Stainless Steel 309H Flanges offer a powerful combination of strength, oxidation resistance, and long service life. Manufactured under ASTM A182 Stainless Steel 309H Flanges standards and identified as UNS S30909 Flange, these components deliver reliable performance in critical industries.
As an experienced Stainless Steel 309H Flanges Manufacturer, Supplier, and Stockists in India, we focus on quality, transparency, and technical expertise — ensuring you receive the right product for your application, backed by proper certification and dependable service.
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