Stainless Steel 309H Flanges Manufacturer, Supplier & Exporter in India
Stainless Steel 309H Flanges are a type of pipe joint used for higher temperatures and made of an Austenitic chromium-nickel stainless steel alloy having increased carbon content for improved high-temperature tensile strength. These flanges find applications in several industries such as; refineries, heat treatment shops, power generation plants, petroleum industry, furnaces and in different types of industrial pipings.
We are a renowned manufacturer and exporter of ASTM A182 F309H Flanges that includes different types such as; welded, forged, threaded, slip-on, blind, socket weld, weld neck, lap joint, and custom-designed flanges. Our Stainless Steel 309H Industrial Flanges offer great resistance to high temperature, as well as corrosion and other external elements for a prolonged lifespan in diverse conditions.
What is a Stainless Steel 309H Flange?
A Stainless Steel 309H Flange is a high-carbon version of SS 309 used for connecting pipes, valves, pumps, and equipment in high-temperature industrial systems. The increased carbon content improves creep resistance and mechanical strength at elevated temperatures. ASTM A182 F309H Flanges offer excellent oxidation resistance up to 1093°C (2000°F), making them suitable for heat exchangers, boilers, furnaces, petrochemical plants, and power generation facilities.
ASTM A182 F309H Flanges – Product Overview
We are the premium ASTM A182 F309H Flange Manufacturer that produces top-grade forged flanges that work effectively even under extreme temperature conditions as well as high acidic environment. Increased carbon in Grade 309H provides higher strength, creep and structural integrity at higher temperature and even with a higher duration of exposure. These SS 309H Flange produced with assured raw materials are rigorously inspected in terms of size and mechanical integrity.
Available standards include:
- ASTM A182 F309H Flanges
- ASME B16.5 Flanges
- ASME B16.47 Flanges
- MSS SP-44
- EN 1092-1
- DIN Standard Flanges
As an experienced UNS S30909 Pipe Flanges Exporter, we supply products to customers across Asia, Europe, the Middle East, Africa, and North America.
Benefits of Stainless Steel 309H Flanges
The popularity of Stainless Steel 309H Industrial Flanges stems from their ability to perform under extreme operating conditions.
Key Advantages
- Excellent oxidation resistance at elevated temperatures
- Enhanced creep strength due to higher carbon content
- Outstanding resistance to thermal cycling
- Good corrosion resistance in oxidizing environments
- Superior mechanical properties
- Excellent weldability and fabrication characteristics
- Long operational lifespan
- Reduced maintenance requirements
- Reliable sealing performance
- Suitable for high-pressure applications
These characteristics make UNS S30909 Flange products ideal for industries requiring dependable performance in high-temperature environments.
Schedule and Size Chart
| Nominal Pipe Size (NPS) | Schedule | Flange Size (Inches) | Outside Diameter (OD) (mm) | Thickness (mm) |
| 1/2″ | 10, 40, 80 | 3.5″ | 88.9 | 9.53 |
| 3/4″ | 10, 40, 80 | 3.88″ | 98.43 | 10.29 |
| 1″ | 10, 40, 80 | 4.25″ | 107.95 | 11.18 |
| 1-1/2″ | 10, 40, 80 | 5.0″ | 127 | 14.27 |
| 2″ | 10, 40, 80 | 6.0″ | 152.4 | 15.75 |
| 3″ | 10, 40, 80 | 7.5″ | 190.5 | 19.05 |
| 4″ | 10, 40, 80 | 9.0″ | 228.6 | 23.83 |
| 6″ | 10, 40, 80 | 11.0″ | 279.4 | 26.19 |
| 8″ | 10, 40, 80 | 13.5″ | 342.9 | 28.58 |
| 10″ | 10, 40, 80 | 16.0″ | 406.4 | 31.75 |
Mechanical Properties Chart
| Property | Value |
| Tensile Strength | 620 MPa (90,000 psi) |
| Yield Strength | 310 MPa (45,000 psi) |
| Elongation at Break | 40% |
| Hardness, Rockwell B (HRB) | 95 max |
| Modulus of Elasticity | 200 GPa |
| Poisson’s Ratio | 0.30 |
| Impact Toughness | 60 J |
Specifications Chart
| Specification | Details |
| ASTM Standards | ASTM A182, ASTM A240 |
| ASME Standards | ASME SA182, ASME SA240 |
| Size Range | 1/2″ to 48″ (DN15 to DN1200) |
| Flange Types | Weld Neck, Slip-On, Socket Weld, Blind, Lap Joint |
| Pressure Class | 150# to 2500# |
| Face Type | RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint) |
| Manufacturing Process | Forging, Machining, Heat Treatment |
Chemical Composition Chart
| Element | Composition (%) |
| Carbon (C) | 0.04 – 0.10 |
| Chromium (Cr) | 22.0 – 24.0 |
| Nickel (Ni) | 12.0 – 15.0 |
| Manganese (Mn) | 2.0 max |
| Silicon (Si) | 1.0 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Iron (Fe) | Balance |
Physical Properties Chart
| Property | Value |
| Density | 7.89 g/cm³ |
| Melting Range | 1400 – 1450°C (2552 – 2642°F) |
| Thermal Conductivity at 100°C | 14.2 W/m.K |
| Thermal Expansion Coefficient | 15.1 µm/m°C (20-100°C) |
| Specific Heat Capacity | 500 J/kg.K |
| Electrical Resistivity | 0.94 µΩ.m |
Types of SS 309H Flanges We Supply
We offer a complete range of SS 1.4828 Flanges to suit diverse piping and process system requirements.
Weld Neck Flanges
Designed for high-pressure and high-temperature applications, weld neck flanges provide excellent stress distribution and structural strength.
Slip-On Flanges
Easy to install and cost-effective, slip-on flanges are commonly used in low-pressure piping systems.
Blind Flanges
Used to terminate pipelines, pressure vessel openings, and equipment nozzles.
Socket Weld Flanges
Ideal for smaller pipe sizes operating under high-pressure conditions.
Threaded Flanges
Suitable for systems where welding is not feasible.
Lap Joint Flanges
Preferred in applications requiring frequent dismantling and maintenance.
Long Weld Neck Flanges
Commonly used in pressure vessels and process equipment.
Orifice Flanges
Used for flow measurement and monitoring applications.
Applications of Stainless Steel 309H Industrial Flanges
Because of their excellent heat resistance and strength, Stainless Steel 309H Industrial Flanges are extensively used across various industries.
Petrochemical Industry
Used in reactors, process piping, cracking units, and heat exchangers.
Oil & Gas Industry
Suitable for high-temperature process lines and refinery equipment.
Power Generation Plants
Used in steam systems, boilers, superheaters, and turbine applications.
Heat Treatment Facilities
Ideal for furnace construction and thermal processing equipment.
Chemical Processing Plants
Provide reliable performance in corrosive and elevated temperature environments.
Pulp & Paper Industry
Used in chemical recovery boilers and process piping systems.
Fertilizer Plants
Suitable for handling aggressive chemicals and high-temperature media.
Cement Industry
Commonly utilized in kiln systems and heat recovery equipment.
Why Choose Our ASTM A182 F309H Flanges?
Selecting the right supplier directly impacts the performance and reliability of your piping system.
What Sets Us Apart?
- Extensive inventory of standard and custom flange sizes
- Strict adherence to ASTM, ASME, DIN, and EN specifications
- Comprehensive material traceability
- Competitive pricing
- Fast delivery schedules
- Export-quality packaging
- Third-party inspection support
- Mill Test Certificates (MTC) supplied
- Global shipping capabilities
- Technical support from experienced professionals
As a trusted 309 Stainless Steel Flanges Supplier in India, we focus on delivering quality products that meet stringent industry requirements.
Quality Assurance and Testing
Every SS 1.4828 Flanges product undergoes comprehensive quality testing before dispatch.
Inspection Procedures
- Positive Material Identification (PMI)
- Chemical Analysis
- Mechanical Testing
- Hardness Testing
- Dimensional Inspection
- Ultrasonic Testing
- Visual Examination
- Hydrostatic Testing
- Third-Party Inspection
These procedures ensure that every UNS S30909 Flange meets international quality standards and customer specifications.
Packaging, Supply & Export
As a recognized UNS S30909 Pipe Flanges Exporter, we ensure secure packaging and safe transportation.
Packaging options include:
- Wooden Boxes
- Fumigated Wooden Crates
- Pallets
- Bubble Wrapping
- Waterproof Packaging
- Customized Export Packaging
We export ASTM A182 F309H Flanges to:
- United States
- United Kingdom
- Germany
- Italy
- Saudi Arabia
- UAE
- Qatar
- South Africa
- Singapore
- Malaysia
- Australia
Frequently Asked Questions
What is the difference between SS 309 and SS 309H Flanges?
SS 309H contains higher carbon content than SS 309, providing improved creep resistance and high-temperature strength.
What is the ASTM specification for 309H flanges?
The standard specification is ASTM A182 F309H for forged stainless steel flanges and fittings used in high-temperature applications.
What is the UNS number for 309H stainless steel?
The UNS designation for 309H stainless steel is UNS S30909.
Are ASTM A182 F309H Flanges suitable for high-temperature service?
Yes. They offer excellent oxidation resistance and mechanical stability at temperatures reaching approximately 1093°C.
Which industries commonly use SS 309H Flanges?
Petrochemical, power generation, oil & gas, heat treatment, chemical processing, cement, and fertilizer industries.
Global Reach
ASC LLP boasts a robust global presence, committed to delivering unparalleled service and quality to clients around the world. Our dedication to prompt delivery and exceptional customer care sets us apart in the industry. Major corporations across the USA, Europe, Asia, and other regions place their trust in our high-quality 309H Stainless Steel Flanges. This widespread trust underscores our reputation for reliability and excellence. By consistently meeting and exceeding the expectations of our international clientele, we continue to solidify our position as a leader in the global steel market.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
