Stainless Steel 321H Flanges are high-temperature, high-creep-strength, versions of SS 321 designed to be used at temperatures over 538 °C (1000 °F). where standard SS 321 flanges start to lose long-term structural integrity. The stainless steel flanges distinction is the presence of the controlled higher carbon content (0.04-0.10%) and the required grain size (ASTM No. 7 or larger), which contribute considerably to the increase in creep rupture strength and make ASTM A182 F321H the specified grade of the superheater tubes, steam headers, petrochemical furnaces, and power plant piping. Being a titanium-stabilized grade (UNS S32109, DIN 1.4878, X12CrNiTi18-9), SS 321H does not develop an intergranular corrosion at weld boundaries without post-weld heat treatment, even when operating at extreme temperatures. Amardeep Steel is a supplier of EIL approved SS 321H flanges with EN 10204 3.1 Mill Test Certificates, stock available in different forms and types.
Specification of Stainless Steel 321H Flanges
| Category | Specification Details |
|---|---|
| Manufacturing Standards | ASME/ANSI B16.5, B16.36, B16.47 (A & B), B16.48, MSS S44, API 7S-15/43, API 605, EN-1092, BS 10, BS 4504, BS 1560-3.1, DIN, GOST, JIS B2220, ISO 7005-1 |
| ANSI Pressure Ratings | Class 150, 300, 600, 900, 1500, 2500 |
| DIN / EN / UNI Ratings | 6 Bar, 10 Bar, 16 Bar, 25 Bar, 40 Bar; PN6, PN10, PN16, PN25, PN40, PN64 |
| JIS Ratings | 5K, 10K, 16K, 20K, 30K, 40K, 63K |
| Common Types | Threaded, Screwed, Forged, Plate |
| Flange Face Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Lap-Joint Face (LJF), Male-Female (LMF/SMF), Tongue & Groove |
| Production Technique | Forged, Heat treated, and Machined |
| Testing & Inspection | Direct-reading Spectrograph, Magnetic Particle Detector, Hydrostatic Testing, X-ray Detector, Ultrasonic Flaw Detector |
| Production Equipment | Pushing Machine, Press Machine, Bending Machine, Sand-blasting Machine, Electric Bevelling Machine |
Chemical Composition of 321H Flanges
| Grade | C | Mn | Si | P | S | Cr | Ni | Ti |
|---|---|---|---|---|---|---|---|---|
| SS 321H | 0.04-0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.0–19.0 | 9.0–12.0 | 4(C+N)-0.70 max |
Mechanical Properties of SUS 321H Flanges
| Density | Melting Point | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
|---|---|---|---|---|
| 8.0 g/cm³ | 1457 °C (2650 °F) | 75,000 Psi (515 MPa) | 30,000 Psi (205 MPa) | 35% |
ASTM A182 SS 321H Flanges Equivalent Grades
| Grade | Werkstoff Nr. | UNS | JIS | EN |
|---|---|---|---|---|
| SS 321H | 1.4878 | S32109 | SUS 321H | X12CrNiTi18-9 |
Different Types of Stainless Steel 321H Flanges
SS 321H Socket Weld Flanges
SS 321H Spectacle Blind Flanges
SS 321H Long Weld Neck Flanges
SS 321H Blind Flanges
SS 321H Forged Flanges
SS 321H Lap Joint Flanges
SS 321H Orifice Flanges
SS 321H Plate Flanges
SS 321H RTJ Flanges
SS 321H Slip on Flanges
SS 321H Threaded Flanges
SS 321H Weld Neck Flanges
Dimension Chart of 321H Stainless Steel Flange
| NPS (Inches) | Flange Diameter (Inches) | No. of Bolts | Bolt Diameter (Inches) | Bolt Hole Diameter (Inches) | Bolt Circle (Inches) |
|---|---|---|---|---|---|
| 1/4″ | 3.375 | 4 | 0.50 | 0.62 | 2.25 |
| 1/2″ | 3.50 | 4 | 0.50 | 0.62 | 2.375 |
| 3/4″ | 3.875 | 4 | 0.50 | 0.62 | 2.75 |
| 1″ | 4.25 | 4 | 0.50 | 0.62 | 3.125 |
| 1-1/4″ | 4.625 | 4 | 0.50 | 0.62 | 3.50 |
| 1-1/2″ | 5.00 | 4 | 0.50 | 0.62 | 3.875 |
| 2″ | 6.00 | 4 | 0.625 | 0.75 | 4.75 |
| 2-1/2″ | 7.00 | 4 | 0.625 | 0.75 | 5.50 |
| 3″ | 7.50 | 4 | 0.625 | 0.75 | 6.00 |
| 3-1/2″ | 8.50 | 8 | 0.625 | 0.75 | 7.00 |
| 4″ | 9.00 | 8 | 0.625 | 0.75 | 7.50 |
| 5″ | 10.00 | 8 | 0.75 | 0.88 | 8.50 |
| 6″ | 11.00 | 8 | 0.75 | 0.88 | 9.50 |
| 8″ | 13.50 | 8 | 0.75 | 0.88 | 11.75 |
| 10″ | 16.00 | 12 | 0.875 | 1.00 | 14.25 |
| 12″ | 19.00 | 12 | 0.875 | 1.00 | 17.00 |
| 14″ | 21.00 | 12 | 1.00 | 1.12 | 18.75 |
| 16″ | 23.50 | 16 | 1.00 | 1.12 | 21.25 |
| 18″ | 25.00 | 16 | 1.125 | 1.25 | 22.75 |
| 20″ | 27.50 | 20 | 1.125 | 1.25 | 25.00 |
| 24″ | 32.00 | 20 | 1.25 | 1.38 | 29.50 |
Application Usage of Stainless Steel 321H Flanges
- Petrochemical Industry
- Chemical Industry
- Oil and Gas Industry
- Pulp & Paper Industry
- Power Plant Industry
- Food Processing Industry
- Pharmaceuticals Industry
- Energy Industry
- Aerospace Industry
Related Products
- Stainless Steel 304 Flanges
- Stainless Steel 304L Flanges
- Stainless Steel 304H Flanges
- Stainless Steel 310 Flanges
- Stainless Steel 310S Flanges
- Stainless Steel 316 Flanges
- Stainless Steel 316L Flanges
- Stainless Steel 316H Flanges
- Stainless Steel 317 Flanges
- Stainless Steel 317L Flanges
- Stainless Steel 321 Flanges
- Stainless Steel 321H Flanges
- Stainless Steel 347 Flanges
- Stainless Steel 347H Flanges
- Stainless Steel 446 Flanges
Frequently Asked Questions
What is Stainless Steel 321H flange?
A Stainless Steel 321H flange is a high-carbon, titanium-stabilized stainless steel pipe fitting designed for high-temperature applications with improved creep strength.
What is ASTM A182 F321H flange specification?
ASTM A182 F321H is a standard specification for forged stainless steel flanges made from SS 321H, suitable for high-temperature and high-pressure service.
What is the difference between SS 321 and SS 321H flanges?
The main difference is carbon content 321H has higher carbon content than 321, which provides better high-temperature strength, while 321 offers better resistance to corrosion after welding.
Why is SS 321H used for high-temperature applications?
SS 321H is used because its higher carbon content and controlled grain size provide superior creep strength and stability at temperatures above 538°C.
What is the temperature range of SS 321H flanges?
SS 321H flanges are typically used in high-temperature applications above 538°C and can perform effectively up to around 900°C depending on conditions.
