Multinox Inc. is a premier manufacturer, supplier, and stockist of Stainless Steel 347H Rings.
Stainless Steel 347H rings are made from a controlled high-carbon version of the alloy, offering good corrosion resistance, high-heat and creep strength, and good robustness. The chemistry includes chromium (17-20%), nickel (9-13%), and a significant portion of niobium (min. 8 times higher than carbon content). This unique chemical composition provides stability and high-temperature corrosion resistance. Stainless Steel 347H rings are precision-engineered, niobium-stabilized products that maintain overall physical and mechanical properties, along with high-temperature strength even in continuous elevated temperature environments for a longer period of time.



These advanced 347H rings are produced using open-die and closed-die forgings as well as rolling procedures. Each and every ring piece is carefully controlled for dimensional precision, grain structure, and overall mechanical strength. SS 347H rings are available in a wide range of dimensions depending upon outer diameters (145-3000 mm), face heights (up to 49 inches), and weight distribution (ranging up to 60,000 lbs).
These SS 347H rings feature excellent resistance to intergranular corrosion while preventing chromium carbide precipitation during welding procedures at high temperatures. They provide excellent oxidation resistance in continuous high-temperature zones (up to 816°C). Due to the ease of fabrication and welding properties, these rings are the most preferred grade among our clients. 347H rings offer excellent creep and stress-rupture strength in various environments. When applications such as seal flanges, pressure vessel components, turbine parts, or custom-engineered parts operate in high-heat environments and require durability and performance at the same time, 347H rings are considered a superior choice.
We offer different forms such as plate-cut, rolled, forged, and other forms based on clients' requirements. These rings are designed to meet quality standards as well as ASTM A182, ASME SA182, ASTM A479, and ASME SA479 international standards. We are also RoHS and REACH compliant for international supply chains. Multinox Inc. ensures these rings are thoroughly tested to high quality standards, including heat treatment (such as annealing and tempering), destructive and non-destructive tests, to assure complete client satisfaction. Choose Multinox Inc. as your trusted manufacturer and supplier for premium quality Stainless Steel 347H rolled or forged rings with competitive pricing and guaranteed performance.
| Material | Stainless Steel |
| Form | Seamless Rolled Ring, Forged Ring |
| Manufacturing Process | Open Die Forging, Ring Rolling, CNC Machining |
| Outside Diameter (OD) | 145 mm to 3000 mm |
| Inside Diameter (ID) | As per Customer Requirement |
| Maximum Thickness | 300 mm |
| Maximum Face Height | Up to 49 Inches (1245 mm) |
| Maximum Weight | 60,000 lbs (Approx. 27,200 kg) |
| Tolerance | ±0.003" (or as per customer drawing) |
| Surface Finish | Rough Machined, Fully Machined, Bright, Black, Polished |
| Heat Treatment | Annealed, Solution Annealed, Normalized, Quenched & Tempered, As Required |
| Testing | PMI, Ultrasonic Test (UT), Liquid Penetrant Test (LPT), NDT, Hardness Test, Dimensional Inspection |
| Certification | EN 10204 3.1, Mill Test Certificate (MTC) |
| Standards | ASTM, ASME, DIN, EN, ISO (Depending on Material Grade) |
| Applications | Oil & Gas, Petrochemical, Chemical Processing, Marine, Power Plants, Heat Exchangers, Pressure Vessels, Aerospace, Heavy Engineering, Offshore, Fabrication |
| Packaging | Wooden Boxes, Pallets, Bubble Wrap, Export Worthy Packaging |
| Thickness (Inches) | Outer Diameter (OD) (Inches) | Thickness (mm) | Outer Diameter (OD) (mm) |
|---|---|---|---|
| 0.20 | 3.94 - 5.91 | 5 | 100 - 150 |
| 0.39 | 5.91 - 7.87 | 10 | 150 - 200 |
| 0.59 | 7.87 - 9.84 | 15 | 200 - 250 |
| 0.79 | 9.84 - 11.81 | 20 | 250 - 300 |
| 0.98 | 11.81 - 15.75 | 25 | 300 - 400 |
| 1.18 | 15.75 - 19.69 | 30 | 400 - 500 |
| 1.57 | 19.69 - 23.62 | 40 | 500 - 600 |
| 1.97 | 23.62 - 31.50 | 50 | 600 - 800 |
| 2.95 | 31.50 - 39.37 | 75 | 800 - 1000 |
| 3.94 | 39.37 - 59.06 | 100 | 1000 - 1500 |
| 5.91 | 59.06 - 78.74 | 150 | 1500 - 2000 |
| 7.87 | 78.74 - 98.43 | 200 | 2000 - 2500 |
| 9.84 | 98.43 - 118.11 | 250 | 2500 - 3000 |
| 11.81 | 118.11 | 300 | 3000 |
| Stainless Steel 304 Ring | Stainless Steel 304L Ring |
| Stainless Steel 316 Ring | Stainless Steel 316L Ring |
| Stainless Steel 316Ti Ring | Stainless Steel 310 Ring |
| Stainless Steel 317L Ring | Stainless Steel 321 Ring |
| Stainless Steel 347 Ring | Stainless Steel 347H Ring |
| Stainless Steel 410 Ring | Stainless Steel 416 Ring |
| Stainless Steel 420 Ring | Stainless Steel 430 Ring |
| Stainless Steel 440 Ring | Stainless Steel 440C Ring |
| Stainless Steel 446 Ring | ASTM A268/A268M UNS S44600 Ring |
| ASTM A268/A268M EN 1.4749 Ring | 17-4PH Stainless Steel Ring |
| 15-5PH Stainless Steel Ring |
Multinox INC offers Rings at one of the most competitive prices in India. Request the latest Rings Pricelist using the contact form here.