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Gayatri Tubes is the leading manufacturer, exporter, supplier, and stockiest of SS 321/321H Pipe Fittings. We also deal with flanges of the same grade as well. Gayatri Tubes provides a large set of range of SS 321 / 321H Seamless Pipe Fittings and our products include stainless steel 321 reducer, stainless steel 321 elbow, stainless steel 321 caps, stainless steel 321 tee, stainless steel 321 cross, stainless steel 321 end caps, stainless steel 321 stub ends, and stainless steel 321 pipe bends. We manufacture all these variants by making it in compliance with various national and international standards such as the ASTM A-403, ANSI B16.9, 16.28, MSS SP-43, Standards of bevel welding, ANSI B 16.5. We are known as the specialized manufacturers and the suppliers of the stainless steel 321 pipes and we make it available in all the shapes and sizes. They have a radius of bending of 1D to 10D and can have a custom bending radius as well.
Grade 321 is an alloy made up of austenitic steel which has an addition of the element titanium in it. This variant possesses a lot of similarities to the 304 grade of the stainless steel but the difference lies only in the titanium addition which is five times more than that of the carbon content. The core difference is that the titanium which is added to the 321 grade prevents it from getting carbide precipitation at the time of welding. The SS 321 / 321H grades are known for their usage in conditions of higher temperatures such as 900 degrees Celsius. These grades have furthermore a good capability of being welded and formed. They are used majorly in operating temperature conditions such as the temperatures that exceed a minimum of 500 degree Celsius.
The grade 321H is known popularly by the name of UNS S32109 and is just a version of 3231 grade with a higher concentration of carbon. These are built to provide a higher strength of temperature to the fittings. They possess various excellent properties such as an excellent resistant to corrosion, very good creeping strength, and providevery high resistant to organic as well as inorganic chemicals.
| STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
| SS 321 | 1.4541 | S32100 | SUS 321 | X6CrNiTi18-10 |
| SS 321H | 1.4878 | S32109 | SUS 321H | X12CrNiTi18-9 |
| Specifications | ASTM A403 / ASME SA403 |
| Dimensions | ASME/ANSI B16.9, ASME B16.28, MSS-SP-43 |
| Size | 1/8” NB TO 48” NB. (Seamless & 100% X-Ray Welded, Fabricated) |
| Type | Seamless / Welded / Fabricated |
| Thickness | Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160s, Sch XXS |
| Bending Radius | R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom |
| Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti |
| SS 321 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 - 19.00 | 0.10 max | 9.00 - 12.00 | 5(C+N) – 0.70 max |
| SS 321H | 0.04 – 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 - 19.00 | 0.10 max | 9.00 – 12.00 | 4(C+N) – 0.70 max |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1457 °C (2650 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
