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Stainless Steel 321/321H Flanges are high-temperature resistant components widely used in industries that demand excellent strength, oxidation resistance, and performance under extreme conditions. Manufactured from Grade 321/321H 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 321/321H 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 321/321H 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 321/321H 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 321/321H 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 321/321H 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 E321/321H 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 321/321H 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 | Flange Type | Material Grade |
|---|---|---|---|---|
| ASME B16.5 / B16.47 | 1/2" – 48" | 150# – 2500# | Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint | SS 321 / SS 321H |
| EN 1092-1 | DN15 – DN1200 | PN6 – PN40 | Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint | SS 321 / SS 321H |
| DIN / JIS | DN15 – DN1000 | PN6 – PN40 | Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint | SS 321 / SS 321H |
Chemical Composition (Typical ranges for SS321/321H)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | 321 (%) | 321H (%) |
|---|---|---|
| Carbon (C) | 0.08 max | 0.08 – 0.10 |
| Chromium (Cr) | 17.0 – 19.0 | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 | 9.0 – 12.0 |
| 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 |
| Titanium (Ti) | 5 x C min – 0.70 | 5 x C min – 0.70 |
| Iron (Fe) | Balance | Balance |
Mechanical Properties (Typical)
| Property | 321 | 321H |
|---|---|---|
| Tensile Strength (MPa) | 515 – 827 | 515 – 827 |
| Yield Strength (MPa) | 205 min | 205 min |
| Elongation (%) | 40 min | 40 min |
| Hardness (HRB) | 92 max | 92 max |
| Melting Point (°C) | 1450 – 1520 | 1450 – 1520 |
| Modulus of Elasticity (GPa) | 193 | 193 |
| Density (g/cm³) | 8.0 | 8.0 |
Equivalent Grades
| Standard | 321 | 321H |
|---|---|---|
| UNS | S32100 | S32109 |
| EN / DIN | 1.4541 | 1.4878 |
| JIS | SN 321 | SN 321H |
| GB | 06Cr19Ni10 | 06Cr19Ni10Ti |
| Other | ASTM A182 F321 | ASTM A182 F321H |
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 (inches) | Nominal Size (mm) | Outside Diameter (OD) mm | Bolt Circle Diameter (BCD) mm | Number of Bolts | Bolt Size | Flange Thickness (mm) | Weight (kg) |
|---|---|---|---|---|---|---|---|
| 1/2" | 15 | 95 | 65 | 4 | M16 | 16 | 0.8 |
| 1" | 25 | 120 | 85 | 4 | M16 | 18 | 1.2 |
| 2" | 50 | 165 | 125 | 4 | M16 | 20 | 2.5 |
| 4" | 100 | 220 | 180 | 8 | M16 | 22 | 5.5 |
| 6" | 150 | 280 | 240 | 8 | M20 | 24 | 9.8 |
| 8" | 200 | 350 | 305 | 8 | M20 | 26 | 15.5 |
| 10" | 250 | 405 | 365 | 12 | M20 | 28 | 22.5 |
| 12" | 300 | 460 | 425 | 12 | M24 | 30 | 31.0 |
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 321/321H Flange?
Stainless Steel 321/321H Flanges are austenitic stainless steel flanges stabilized with titanium. They offer excellent resistance to intergranular corrosion and are suitable for high-temperature applications.
Difference between SS 321 and SS 321H Flanges?
SS 321H has a higher carbon content (0.08–0.10%) than SS 321 (0.08% max), which provides higher strength at elevated temperatures, making it suitable for high-temperature service.
What are the common types of SS 321/321H Flanges?
Common types include Weld Neck, Slip-On, Blind, Socket Weld, Threaded, and Lap Joint flanges.
What standards do SS 321/321H Flanges conform to?
They conform to standards such as ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS, and ASTM A182 for forged flanges.
Where are SS 321/321H Flanges used?
They are used in chemical, petrochemical, oil & gas, power generation, and other industrial applications where high temperature and corrosion resistance are required.
Pipes & Tubes Supplier
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