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Stainless Steel 347/347H Flanges are high-temperature resistant components widely used in industries that demand excellent strength, oxidation resistance, and performance under extreme conditions. Manufactured from Grade 347/347H stainless steel, these flanges combine the superior properties of chromium and nickel, making them ideal for applications in heat treatment equipment, furnaces, and chemical processing plants.
Grade 347/347H stainless steel contains a high percentage of chromium (25%) and nickel (20%), providing outstanding resistance to oxidation and scaling even at temperatures up to 1100°C. The alloy offers good ductility and weldability, allowing it to be easily fabricated into various flange types such as weld neck, slip-on, blind, socket weld, lap joint, and threaded flanges.
SS 347/347H flanges are especially preferred in environments where sulfur dioxide gas and oxidizing atmospheres are present. Their excellent resistance to carburizing and reducing environments ensures long-term reliability and minimal maintenance. This makes them suitable for high-temperature service in industries like petrochemical, refinery, power generation, and heat exchangers.
One of the key advantages of Stainless Steel 347/347H Flanges is their superior corrosion resistance in moderately carburizing environments, as well as in environments containing nitric and sulfuric acids. They can also resist oxidation in continuous service up to 1150°C and intermittent service up to 1035°C, outperforming many standard stainless steel grades.
Stainless Steel 347/347H Flanges are available in a wide range of standards including ASME, ANSI, DIN, EN, and BS specifications. Common pressure ratings include Class 150, 300, 600, 900, and 1500, making them adaptable for different pressure and temperature conditions. Each flange is precisely machined to ensure accurate fit, easy installation, and leak-free operation.
To meet diverse industry needs, SS 347/347H flanges are offered in various surface finishes such as mirror finish, matte, rough-turned, and custom polished options. Their smooth surface finish enhances corrosion resistance while ensuring secure sealing in piping systems carrying hot gases, steam, or corrosive fluids.
These flanges exhibit excellent machinability and can be welded using standard fusion and resistance methods. However, the use of filler metals like AWS E347/347H electrodes is recommended to retain corrosion resistance. Post-weld heat treatment is not necessary in most applications, making fabrication efficient and cost-effective.
Stainless Steel 347/347H Flanges find applications in a wide range of sectors, including oil and gas refineries, thermal processing equipment, cement plants, chemical industries, power plants, and marine environments. Their ability to withstand repeated thermal cycling and extreme temperature variations makes them a reliable choice for long-term operations.
Specification Table
| Standard | Material Grade | Type | Size Range | Pressure Rating | Face Type | Finish |
|---|---|---|---|---|---|---|
| ASME B16.5 / B16.47 | SS 347 / 347H | Weld Neck, Slip-On, Socket Weld, Blind, Threaded, Lap Joint | 1/2" – 48" | 150# – 2500# | RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint) | Polished, Mill Finish |
Chemical Composition (Typical ranges for SS347/347H)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | 347 | 347H |
|---|---|---|
| Carbon (C) | 0.08% max | 0.04% min – 0.10% max |
| Manganese (Mn) | 2.0% max | 2.0% max |
| Phosphorus (P) | 0.045% max | 0.045% max |
| Sulfur (S) | 0.03% max | 0.03% max |
| Silicon (Si) | 1.0% max | 1.0% max |
| Chromium (Cr) | 17.0 – 19.0% | 17.0 – 19.0% |
| Nickel (Ni) | 9.0 – 13.0% | 9.0 – 13.0% |
| Niobium (Nb) + Tantalum (Ta) | Min 10xC | Min 10xC |
| Iron (Fe) | Balance | Balance |
Mechanical Properties (Typical)
| Property | 347 | 347H | Test Method |
|---|---|---|---|
| Tensile Strength | 515 – 827 MPa | 515 – 827 MPa | ASTM A182 / ASME B16.5 |
| Yield Strength (0.2% offset) | 205 MPa min | 205 MPa min | ASTM A182 / ASME B16.5 |
| Elongation in 50 mm | 40% min | 40% min | ASTM A182 / ASME B16.5 |
| Hardness (Brinell) | ≤ 217 HB | ≤ 217 HB | ASTM E10 |
| Hardness (Rockwell) | ≤ 92 HRB | ≤ 92 HRB | ASTM E18 |
| Impact Toughness | ≥ 20 J | ≥ 20 J | ASTM E23 |
Equivalent Grades
| Standard | 347 | 347H |
|---|---|---|
| ASTM / ASME | A182 F347 | A182 F347H |
| EN / DIN | 1.4550 | 1.4550 / 1.4550H |
| JIS | SN347 / SUS347 | SN347H / SUS347H |
| ISO | 347 | 347H |
| UNS | S34700 | S34709 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Nominal Size (inch) | Outside Diameter (mm) | Bolt Circle Diameter (mm) | No. of Bolts | Bolt Size (mm) | Flange Thickness (mm) | Weight per Flange (kg) |
|---|---|---|---|---|---|---|
| 1/2" | 110 | 85 | 4 | 14 | 16 | 1.2 |
| 1" | 140 | 105 | 4 | 18 | 18 | 2.0 |
| 2" | 165 | 125 | 4 | 18 | 19 | 3.5 |
| 4" | 220 | 180 | 8 | 18 | 21 | 7.8 |
| 6" | 280 | 240 | 8 | 22 | 24 | 14.5 |
| 8" | 360 | 295 | 8 | 22 | 26 | 23.0 |
| 10" | 435 | 355 | 12 | 22 | 28 | 35.0 |
| 12" | 505 | 415 | 12 | 26 | 30 | 50.0 |
| 16" | 635 | 525 | 16 | 30 | 35 | 90.0 |
| 24" | 915 | 755 | 20 | 36 | 45 | 210.0 |
Common Types Of Flangess
Ring Flanges
Type of Flanges
General Flanges
Stainless Steel Pipe Flanges
ASME B16.5 Flanges
Stainless Steel Flanges
Frequently Asked Questions (FAQ)
What is Stainless Steel 347/347H Flange?
Stainless Steel 347/347H Flanges are high-alloy austenitic flanges with added niobium and tantalum for enhanced corrosion resistance and stability at high temperatures. They are commonly used in chemical, petrochemical, and power industries.
What is the difference between 347 and 347H?
347H contains a higher carbon content than 347, which provides better strength at elevated temperatures. 347 is standard, while 347H is preferred for applications above 500°C.
What types of SS 347/347H Flanges are available?
Common types include Weld Neck, Slip-On, Socket Weld, Blind, Threaded, and Lap Joint flanges. Each type is suitable for different piping requirements.
What are the common standards for SS 347/347H Flanges?
They are manufactured according to ASTM A182, ASME B16.5, ASME B16.47, and other international standards ensuring quality and compatibility.
What are the applications of Stainless Steel 347/347H Flanges?
They are used in high-temperature and corrosive environments such as chemical processing, oil & gas, boilers, heat exchangers, and power plants.
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