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Stainless Steel 310 Flanges are high-temperature resistant components widely used in industries that demand excellent strength, oxidation resistance, and performance under extreme conditions. Manufactured from Grade 310 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 310 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 310 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 310 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 310 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 310 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 E310 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 310 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 Name | Stainless Steel 310 Flanges |
| Grade | SS 310 / 310S |
| Standard | ASTM A182 / ASME SA182 |
| Flange Face Type | Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
| Type | Weld Neck, Slip On, Socket Weld, Blind, Lap Joint, Threaded, Long Weld Neck |
| Pressure Class | 150#, 300#, 400#, 600#, 900#, 1500#, 2500# |
| Size Range | ½” NB to 48” NB (Custom sizes available on request) |
| Facing | RF / RTJ / FF |
| Form | Forged, Plate, or Cast Flanges |
| Manufacturing Process | Forged / Heat Treated / Machined |
| Surface Finish | Smooth Finish, Serrated Finish, Stock Finish, Mirror Finish |
| Temperature Range | Up to 1100°C (Continuous Service) |
| Connection Type | Welded / Screwed / Threaded / Bolted |
| Certification | EN 10204 3.1 / 3.2, NACE MR0175, MTC as per EN standards |
| Applications | Petrochemical Industry, Power Generation, Heat Exchangers, Chemical Processing, Furnace Components |
| Origin | Indian / European / Japanese Make |
Chemical Composition (Typical ranges for SS310)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 19.0 – 22.0 |
| Carbon (C) | ≤ 0.25 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.50 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Tensile Strength | 515 MPa (min) |
| Yield Strength (0.2% Offset) | 205 MPa (min) |
| Elongation | 40% (min) |
| Hardness (Brinell) | ≤ 217 HB |
| Modulus of Elasticity | 200 GPa |
| Melting Point | 1400 – 1450°C |
| Density | 8.0 g/cm³ |
| Poisson’s Ratio | 0.30 |
| Thermal Conductivity | 14.2 W/m·K at 100°C |
| Coefficient of Thermal Expansion | 15.9 µm/m°C (0–100°C) |
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S31000 / S31008 |
| Werkstoff Nr. | 1.4841 / 1.4845 |
| EN | X15CrNi25-20 / X8CrNi25-21 |
| BS | 310S24 / 310S16 |
| AFNOR | Z15CN25-20 / Z8CN25-21 |
| JIS | SUS 310 / SUS 310S |
| GOST | 20Ch25N20S2 |
| DIN | X15CrNi25-20 / X8CrNi25-21 |
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 Pipe Size (NPS) | Outside Diameter (OD) mm | Thickness (mm) | Raised Face Dia. (mm) | Bolt Circle Dia. (mm) | No. of Bolts | Approx. Weight (kg) |
|---|---|---|---|---|---|---|
| ½" | 89 | 11.2 | 35 | 60.3 | 4 | 0.90 |
| ¾" | 98 | 12.7 | 43 | 69.9 | 4 | 1.10 |
| 1" | 108 | 14.3 | 51 | 79.4 | 4 | 1.50 |
| 1½" | 127 | 15.9 | 73 | 98.4 | 4 | 2.10 |
| 2" | 152 | 17.5 | 92 | 120.7 | 4 | 3.20 |
| 3" | 191 | 19.1 | 127 | 152.4 | 4 | 4.50 |
| 4" | 229 | 22.3 | 157 | 190.5 | 8 | 7.00 |
| 6" | 279 | 25.4 | 216 | 241.3 | 8 | 11.00 |
| 8" | 343 | 28.6 | 270 | 298.5 | 8 | 19.00 |
| 10" | 406 | 30.2 | 324 | 362.0 | 12 | 27.00 |
| 12" | 483 | 31.8 | 381 | 431.8 | 12 | 39.00 |
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 are Stainless Steel 310 Flanges?
Stainless Steel 310 Flanges are high-temperature resistant components made from an austenitic chromium-nickel alloy (Grade 310). They are designed for connecting pipes, valves, pumps, and other equipment, offering excellent strength and oxidation resistance up to 1100°C.
What is the chemical composition of SS 310 flanges?
SS 310 flanges typically contain 24–26% chromium, 19–22% nickel, up to 0.25% carbon, and small amounts of manganese, silicon, and sulfur. This composition provides superior corrosion and heat resistance compared to standard stainless steels.
Where are Stainless Steel 310 Flanges used?
These flanges are widely used in industries such as petrochemical, power generation, furnace construction, cement plants, and thermal processing equipment — wherever components are exposed to high temperatures and corrosive environments.
What are the different types of SS 310 flanges available?
The most common types include Weld Neck, Slip-On, Blind, Socket Weld, Lap Joint, Threaded, and Long Weld Neck flanges. Each type serves a unique purpose depending on pressure, temperature, and connection requirements.
What standards and specifications do Stainless Steel 310 Flanges follow?
They are manufactured in accordance with ASTM A182 / ASME SA182 standards and are available in pressure ratings from Class 150 to Class 2500, following ANSI, DIN, EN, and BS standards.
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