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Stainless Steel 321H Flanges consist of the chromium-nickel austenitic type of stainless steel that possesses great amounts of resistance against intergranular and oxidation corrosion at high temperatures. Compared to standard 321 grade, SS 321H contains a higher carbon content, providing improved high-temperature strength and creep resistance. This material is made up of different chemical compositions in which 17 percent chromium and 9 percent nickel are present and along with some other small amounts, such as carbon, manganese, silicon, phosphorus, sulphur, nitrogen, titanium and iron. Solitaire Overseas is one of the top Manufacturers and Suppliers of stainless steel 321H flanges in India. It has good mechanical strength, durability and hardness, suitable for use in harsh environments. To suit various piping requirements, Stainless Steel 321H Flanges are available in different types such as Blind Flanges, Slip-On Flanges, Socket Weld Flanges, Weld Neck Flanges and Plate Flanges.
Get a Free Quote for Stainless Steel 321H Flanges →| Specification Parameter | Details / Standards |
|---|---|
| Material Specification | ASTM A182 / ASME SA182 (Forged Alloy and Stainless Steel Components) |
| Class / Pressure Rating | 150#, 300#, 600#, 900#, 1500#, 2500# PN6, PN10, PN16, PN25, PN40, PN64, etc. |
| Size Chart Range | 1/2" (15 NB) to 48" (1200 NB) |
| Dimensional Standards | ANSI/ASME B16.5, B16.48, B16.47 Series A & B, BS 4504, BS 10, EN-1092, DIN, etc. |
| Standard Organizations | ANSI, ASME, BS, DIN, EN, etc. |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Ti |
|---|---|---|---|---|---|---|---|---|---|
| SS 321H | 0.04 – 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | — | 9.00 – 12.00 | 4(C+N) – 0.70 max |
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1457°C (2650°F) |
| Tensile Strength (Min) | 75,000 psi (515 MPa) |
| Yield Strength (0.2% Offset Min) | 30,000 psi (205 MPa) |
| Elongation (Min) | 35% |
| Grade | Werkstoff Nr. | UNS | JIS | EN |
|---|---|---|---|---|
| SS 321H | 1.4878 | S32109 | SUS 321H | X12CrNiTi18-9 |
| 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 | 2.250 |
| 1/2" | 3.500 | 4 | 0.50 | 0.62 | 2.375 |
| 3/4" | 3.875 | 4 | 0.50 | 0.62 | 2.750 |
| 1" | 4.250 | 4 | 0.50 | 0.62 | 3.125 |
| 1-1/4" | 4.625 | 4 | 0.50 | 0.62 | 3.500 |
| 1-1/2" | 5.000 | 4 | 0.50 | 0.62 | 3.875 |
| 2" | 6.000 | 4 | 0.625 | 0.75 | 4.750 |
| 2-1/2" | 7.000 | 4 | 0.625 | 0.75 | 5.500 |
| 3" | 7.500 | 4 | 0.625 | 0.75 | 6.000 |
| 3-1/2" | 8.500 | 8 | 0.625 | 0.75 | 7.000 |
| 4" | 9.000 | 8 | 0.625 | 0.75 | 7.500 |
| 5" | 10.000 | 8 | 0.75 | 0.88 | 8.500 |
| 6" | 11.000 | 8 | 0.75 | 0.88 | 9.500 |
| 8" | 13.500 | 8 | 0.75 | 0.88 | 11.750 |
| 10" | 16.000 | 12 | 0.875 | 1.00 | 14.250 |
| 12" | 19.000 | 12 | 0.875 | 1.00 | 17.000 |
| 14" | 21.000 | 12 | 1.00 | 1.12 | 18.750 |
| 16" | 23.500 | 16 | 1.00 | 1.12 | 21.250 |
| 18" | 25.000 | 16 | 1.125 | 1.25 | 22.750 |
| 20" | 27.500 | 20 | 1.125 | 1.25 | 25.000 |
| 24" | 32.000 | 20 | 1.25 | 1.38 | 29.500 |
Stainless Steel 321H Flanges are titanium-stabilized austenitic stainless steel flanges with higher carbon content for improved high-temperature strength. They are widely used in elevated-temperature and corrosive environments.
The UNS number for SS 321H Flanges is S32109. This grade is specifically designed for enhanced performance in high-temperature applications.
The Werkstoff number of Stainless Steel 321H Flanges is 1.4878. It is the European designation for the high-carbon version of SS 321.
The “H” indicates a higher carbon content than standard SS 321. This improves strength and creep resistance at elevated temperatures.
SS 321H contains more carbon than SS 321, providing better high-temperature strength and creep resistance. Both grades are titanium-stabilized and offer excellent corrosion resistance.