Stainless Steel 347 Flanges are high-performance industrial pipe connection components manufactured from stabilized austenitic stainless steel grade 347. This grade contains niobium (columbium), which prevents chromium carbide precipitation during welding and high-temperature service.
Because of this stabilization, Stainless steel 347 pipe flanges provide excellent resistance to intergranular corrosion, oxidation, and high-temperature environments. These properties make them suitable for demanding industrial sectors such as petrochemical plants, oil and gas pipelines, chemical processing facilities, heat exchangers, and power generation plants.
As a trusted Stainless Steel 347 Flanges Manufacturer & Supplier in India, we provide a complete range of ASTM A182 Stainless Steel 347 Flanges including weld neck, slip on, blind, lap joint, threaded, and RTJ flanges manufactured according to international standards.
What are Stainless Steel 347 Flanges?
Stainless Steel 347 Flanges are pipe flanges manufactured from niobium-stabilized stainless steel grade 347 (UNS S34700). These flanges are designed to resist carbide precipitation during welding and high-temperature service, making them ideal for corrosive and high-temperature industrial environments. Common types of SS 347 flanges include:
- SS 347 Weld Neck Flanges
- SS 347 Slip On Flanges
- SS 347 Blind Flanges
- SS 347 Lap Joint Flanges
- SS 347 RTJ Flanges
- ANSI B16.5 SS F347 Screwed Flanges
Because of their excellent corrosion resistance, high temperature strength, and durability, 347 stainless steel pipe flanges are widely used in petrochemical plants, refineries, power stations, and industrial piping systems.
What is Stainless Steel 347 Material?
Stainless Steel 347 is a niobium stabilized austenitic stainless steel alloy designed for applications that involve high temperatures and welding operations.
When stainless steel is exposed to high temperatures, chromium carbide can form at grain boundaries, leading to corrosion. The addition of niobium in grade 347 prevents this issue by stabilizing the carbon in the alloy.
Because of this property, SS UNS S34700 Weld Neck Flange and other flange types provide better resistance to intergranular corrosion compared to standard stainless steel grades. Key characteristics of 347 stainless steel flanges include:
- Excellent high-temperature strength
- Resistance to intergranular corrosion
- Good weldability
- High oxidation resistance
- Long service life in industrial environments
Types of Stainless Steel 347 Pipe Flanges
Industrial piping systems require different flange designs depending on pressure rating, sealing method, and pipe configuration. We supply a wide range of SS 347 flanges to meet different industrial requirements.
➤ SS UNS S34700 Weld Neck Flange
SS 347 weld neck flanges are widely used in high-pressure and high-temperature piping systems. These flanges feature a long tapered hub that helps distribute stress evenly between the pipe and the flange. Benefits include:
- High structural strength
- Reduced stress concentration
- Smooth flow transition inside pipelines
- Suitable for extreme temperature environments
Because of their reliability, SS UNS S34700 Weld Neck Flange is commonly used in refineries, chemical plants, and power generation facilities.
➤ Stainless Steel F347 Slip On Flanges
Stainless Steel F347 Slip On Flanges are easy to install and widely used in low-pressure and moderate-temperature piping systems.
In this design, the pipe slips into the flange before welding. This makes installation faster and more economical compared to other flange types. Applications include:
- Water treatment plants
- Cooling pipelines
- Industrial fluid transport systems
Our SS 347 SO flanges are manufactured with high precision to ensure reliable sealing and long service life.
➤ SS 347 Blind Flanges
SS 347 blind flanges are used to close the end of piping systems. These flanges provide a strong seal and allow easy expansion or modification of pipeline networks. Blind flanges are widely used in:
- Oil and gas pipelines
- Chemical processing plants
- Pressure vessel systems
➤ Manufacturer of SS 347 Lap Joint Flange
As a Manufacturer of SS 347 Lap Joint Flange, we supply flanges designed for systems that require frequent dismantling. These flanges are used with stub ends and provide flexibility for pipe alignment. Typical applications include:
- Food processing plants
- Pharmaceutical industries
- Low-pressure pipeline systems
➤ ANSI B16.5 SS F347 Screwed Flanges
ANSI B16.5 SS F347 Screwed Flanges are also known as threaded flanges. These flanges contain internal threads that connect directly to threaded pipes. They are commonly used where welding is not possible or not recommended. Common uses include:
- Gas distribution systems
- Hazardous environments
- Small-diameter pipelines
➤ 347 Stainless Steel RTJ Flange
The 347 Stainless Steel RTJ Flange (Ring Type Joint flange) is designed for high-pressure and high-temperature applications.
These flanges use a metal ring gasket that creates a very tight seal when compressed between the flange faces. RTJ flanges are commonly used in:
- Offshore oil platforms
- High-pressure drilling systems
- Petrochemical refineries
➤ Stainless Steel 347 Spectacle Blind Flanges
Stainless Steel 347 Spectacle Blind Flanges are used to isolate sections of pipelines. They consist of two discs connected by a small metal section — one open and one solid.vThey allow operators to easily switch between flow operation and complete pipeline isolation.
ASTM A182 Stainless Steel 347 Flanges Specifications
| Specification | Details |
|---|---|
| Material Grade | Stainless Steel 347 |
| UNS Number | S34700 |
| Standard | ASTM A182 / ASME SA182 |
| Flange Standards | ANSI B16.5, ASME B16.47 |
| Pressure Class | 150, 300, 600, 900, 1500, 2500 |
| Flange Types | Weld Neck, Slip On, Blind, Lap Joint, Threaded, RTJ |
| Face Types | Raised Face, Flat Face, Ring Type Join |
| Size Range | ½” to 48” |
Chemical Composition of Stainless Steel 347
| Element | Percentage |
|---|---|
| Carbon | 0.08 max |
| Chromium | 17 – 19 |
| Nickel | 9 – 13 |
| Manganese | 2 max |
| Silicon | 1 max |
| Phosphorus | 0.045 max |
| Sulfur | 0.03 max |
| Niobium + Tantalum | Stabilized |
Mechanical Properties of SS 347 Flanges
| Property | Value |
|---|---|
| Tensile Strength | 515 MPa |
| Yield Strength | 205 MPa |
| Elongation | 40 % |
| Hardness | 201 HB |
Applications of Stainless Steel 347 Flanges
Because of their excellent resistance to corrosion and high temperatures, SS 347 flanges are widely used in industrial sectors such as:
- Oil and gas pipelines
- Petrochemical plants
- Power generation stations
- Chemical processing industries
- Heat exchangers
- Fertilizer plants
- Marine engineering systems
- High-temperature exhaust systems
These industries rely on 347 stainless steel pipe flanges because they provide durable and leak-proof connections.
ASTM A182 Stainless Steel 347 Flanges Suppliers
As experienced ASTM A182 Stainless Steel 347 Flanges Suppliers, we supply a wide inventory of forged stainless steel flanges that meet international standards. Our product range includes:
- SS 347 weld neck flanges
- SS 347 SO flanges
- SS 347 blind flanges
- SS 347 flat face flanges
- 347 Stainless Steel RTJ Flange
- Stainless Steel 347 Spectacle Blind Flanges
Each flange is carefully inspected to ensure dimensional accuracy, corrosion resistance, and long-term reliability in industrial environments.
Stainless Steel 347 Flanges Manufacturer & Supplier
Industries across the world trust high-quality Stainless Steel 347 Flanges because they provide reliable pipe connections in demanding environments. With advanced manufacturing processes and strict quality inspection, these flanges deliver excellent performance in high-pressure and high-temperature piping systems.
Our inventory includes a wide range of SS 347 flanges available in multiple sizes, pressure classes, and flange types to meet diverse industrial requirements.
Frequently Asked Questions About SS 347 Flanges
- ASTM A182
- ASME SA182
- ANSI B16.5
- ASME B16.47
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