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Stainless Steel 316/316L Flanges are high-temperature resistant components widely used in industries that demand excellent strength, oxidation resistance, and performance under extreme conditions. Manufactured from Grade 316/316L 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 316/316L 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 316/316L 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 316/316L 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 316/316L 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 316/316L 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 E316/316L 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 316/316L 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
| Specification | Details |
|---|---|
| Product | Stainless Steel 316 / 316L Flanges |
| Grades | SS 316 / SS 316L |
| Standard | ASTM A182 / ASME SA182 |
| Flange Types | Weld Neck, Slip-On, Blind, Threaded, Socket Weld, Lap Joint, Long Weld Neck |
| Pressure Ratings | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Face Type | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Size Range | ½” to 48” (DN15 to DN1200) |
| Material Form | Forged, Heat Treated, and Machined |
| Manufacturing Standard | ASME B16.5, ASME B16.47, MSS SP-44, DIN, EN, BS, ISO |
| Connection Type | Welded, Screwed, or Bolted |
| Corrosion Resistance | Excellent in marine and chemical environments, especially against chlorides and acids |
| Temperature Range | Up to 870°C (1600°F) in continuous service |
| Applications | Chemical Processing, Oil & Gas, Marine Equipment, Heat Exchangers, Piping Systems |
| End Finish | Smooth, Serrated, Spiral, or Custom as per order |
| Testing | Hydrostatic, PMI, Ultrasonic, Radiography, Visual, and Dimensional Testing |
| Certification | EN 10204 3.1 / 3.2, NACE MR0175, PED, ISO 9001 |
Chemical Composition (Typical ranges for SS316/316L)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | SS 316 | SS 316L |
|---|---|---|
| Carbon (C) | 0.08 max | 0.03 max |
| Chromium (Cr) | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel (Ni) | 10.0 – 14.0 | 10.0 – 14.0 |
| Molybdenum (Mo) | 2.0 – 3.0 | 2.0 – 3.0 |
| Manganese (Mn) | 2.0 max | 2.0 max |
| Silicon (Si) | 1.0 max | 1.0 max |
| Phosphorus (P) | 0.045 max | 0.045 max |
| Sulfur (S) | 0.03 max | 0.03 max |
| Nitrogen (N) | 0.10 max | 0.10 max |
| Iron (Fe) | Balance | Balance |
Mechanical Properties (Typical)
| Property | SS 316 | SS 316L |
|---|---|---|
| Yield Strength (0.2% Offset) | 205 MPa (29,700 psi) min | 170 MPa (24,650 psi) min |
| Tensile Strength | 515 MPa (74,700 psi) min | 485 MPa (70,300 psi) min |
| Elongation (in 50 mm) | 40% min | 40% min |
| Hardness (Brinell) | ≤ 217 HB | ≤ 217 HB |
| Modulus of Elasticity | 193 GPa (28,000 ksi) | 193 GPa (28,000 ksi) |
| Impact Strength (Charpy V-Notch) | > 27 J at room temperature | > 27 J at room temperature |
| Density | 8.0 g/cm³ | 8.0 g/cm³ |
| Melting Point | 1375 – 1400°C | 1375 – 1400°C |
Equivalent Grades
| Standard / Country | SS 316 | SS 316L |
|---|---|---|
| ASTM / ASME (USA) | ASTM A182 F316, A276 F316 | ASTM A182 F316L, A276 F316L |
| UNS | S31600 | S31603 |
| EN (Europe) | 1.4401 | 1.4404 |
| DIN (Germany) | X5CrNiMo17-12-2 | X2CrNiMo17-12-2 |
| JIS (Japan) | SU316 | SU316L |
| GB / Chinese Standard | 0Cr17Ni12Mo2 | 00Cr17Ni12Mo2 |
| BS (British Standard) | 316S11 | 316S16 |
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) | Nominal Diameter (DN) | Outside Diameter (OD) mm | Thickness / Raised Face (mm) | Bolt Circle Diameter (BCD) mm | No. of Bolts | Bolt Size | Weight per Flange (kg) |
|---|---|---|---|---|---|---|---|
| 1/2" | 15 | 95 | 14 | 70 | 4 | M16 | 0.9 |
| 1" | 25 | 120 | 16 | 85 | 4 | M16 | 1.4 |
| 2" | 50 | 150 | 18 | 110 | 4 | M16 | 2.5 |
| 4" | 100 | 220 | 22 | 180 | 8 | M20 | 6.8 |
| 6" | 150 | 280 | 24 | 240 | 8 | M20 | 13.5 |
| 8" | 200 | 360 | 26 | 295 | 8 | M22 | 22.0 |
| 10" | 250 | 445 | 28 | 360 | 12 | M22 | 37.0 |
| 12" | 300 | 520 | 30 | 425 | 12 | M24 | 54.0 |
| 16" | 400 | 635 | 34 | 540 | 16 | M27 | 97.0 |
| 24" | 600 | 915 | 40 | 755 | 20 | M33 | 225.0 |
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 the difference between SS 316 and SS 316L flanges?
SS 316L has a lower carbon content than SS 316, which reduces the risk of carbide precipitation during welding. This makes SS 316L ideal for welded piping systems and applications requiring superior corrosion resistance.
What types of flanges are available in SS 316/316L?
Common types include Weld Neck, Slip-On, Blind, Threaded, Socket Weld, Lap Joint, and Long Weld Neck flanges. They are available in various sizes and pressure ratings according to ASME B16.5 standards.
What are the typical applications of SS 316/316L flanges?
These flanges are widely used in chemical processing, petrochemical, marine, pharmaceutical, food & beverage, and high-temperature piping systems due to their excellent corrosion resistance and strength.
What standards do SS 316/316L flanges conform to?
They conform to ASTM A182, ASME B16.5, ASME B16.47, MSS SP-44, and can also be manufactured according to DIN, EN, JIS, and BS standards as required.
Can SS 316/316L flanges be used in seawater applications?
Yes, SS 316/316L flanges are resistant to chloride corrosion and are suitable for marine and seawater applications. For highly aggressive environments, duplex stainless steel flanges may also be considered.
What is the temperature range for SS 316/316L flanges?
They can operate up to approximately 870°C (1600°F) in continuous service and up to 925°C (1700°F) in intermittent service, depending on the application and pressure rating.
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