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Stainless Steel 317L Flanges are high-temperature resistant components widely used in industries that demand excellent strength, oxidation resistance, and performance under extreme conditions. Manufactured from Grade 317L 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 317L 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 317L 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 317L 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 317L 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 317L 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 E317L 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 317L 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 | Size Range | Pressure Rating | Face Type | Flange Type | End Connection |
|---|---|---|---|---|---|
| ASME B16.5 / B16.47 | 1/2" – 48" | 150# to 2500# | RF / RTJ / FF | Weld Neck, Slip-On, Socket Weld, Blind, Threaded, Lap Joint | Bored / Welded / Threaded |
| DIN EN 1092-1 | DN15 – DN1200 | PN6 to PN40 | RF / FF | Weld Neck, Slip-On, Blind, Threaded | Bored / Welded / Threaded |
| JIS B2220 | 5A – 60A | 10K to 40K | RF | Weld Neck, Slip-On, Blind | Bored / Welded / Threaded |
Chemical Composition (Typical ranges for SS317L)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.030 max |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 11.0 – 14.0 |
| Molybdenum (Mo) | 3.0 – 4.0 |
| Manganese (Mn) | 2.0 max |
| Silicon (Si) | 1.0 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 515 – 720 | MPa |
| Yield Strength (0.2% Offset) | 205 – 275 | MPa |
| Elongation | 40 – 50 | % |
| Hardness (Brinell) | 179 – 217 | HB |
| Impact Strength (Charpy) | ≥ 80 | J |
Equivalent Grades
| Standard | Grade / Designation |
|---|---|
| ASTM / ASME | 317L |
| EN / DIN | 1.4438 / X2CrNiMo18-14-3 |
| JIS | SUS 317L |
| GB / China | 0Cr17Ni12Mo2 |
| UNS | S31703 |
| Werkstoff | 1.4438 |
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 (NPS) | Outside Diameter (OD) | Bolt Circle Diameter (BCD) | Number of Bolts | Bolt Size | Thickness / Raised Face | Weight (kg) |
|---|---|---|---|---|---|---|
| 1/2" | 95 mm | 70 mm | 4 | M16 | 16 mm | 1.2 |
| 1" | 120 mm | 85 mm | 4 | M16 | 18 mm | 2.5 |
| 2" | 150 mm | 110 mm | 4 | M16 | 20 mm | 5.5 |
| 4" | 230 mm | 190 mm | 8 | M16 | 22 mm | 11.5 |
| 6" | 295 mm | 250 mm | 8 | M20 | 24 mm | 21.5 |
| 8" | 355 mm | 310 mm | 8 | M20 | 26 mm | 33.0 |
| 10" | 445 mm | 370 mm | 12 | M22 | 28 mm | 50.0 |
| 12" | 515 mm | 430 mm | 12 | M22 | 30 mm | 70.0 |
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 317L Flange?
Stainless Steel 317L Flanges are corrosion-resistant pipe fittings made from low-carbon austenitic SS 317L steel. They are designed to connect, seal, or terminate piping systems in chemical, petrochemical, and industrial applications.
What are the types of SS 317L Flanges available?
Common types include Weld Neck, Slip-On, Socket Weld, Blind, Threaded, and Lap Joint Flanges.
What are the key chemical elements in SS 317L?
SS 317L contains Chromium (18-20%), Nickel (11-14%), Molybdenum (3-4%), with low Carbon (max 0.03%) for corrosion resistance and durability.
What are the applications of SS 317L Flanges?
They are used in chemical processing, petrochemical plants, marine environments, pharmaceuticals, and food processing industries due to excellent corrosion and heat resistance.
What are the standards for SS 317L Flanges?
SS 317L Flanges are manufactured according to ASTM / ASME B16.5, B16.47, DIN EN 1092-1, and JIS B2220 standards.
Pipes & Tubes Supplier
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