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Gayatri Tubes is a known name in the field of SS 347/ 347H compression tube fittings. We offer a wide range of fittings in all size, shape and specification. We consider ourselves fortunate to have served a large group of clients with our superior products. SS 347 347 H compression tube fittings are useful where hot solutions of caustic soda, phosphates, or alkaline silicates are in use. It is always good to remove organic substances and its residues from the surface. This carries out in special cleaning lines or in the cleaning sections. It has many suitable properties such as strength, wear, and corrosion resistance. It is similar to grade 321 SS but the only difference lies in slightly improved corrosion resistance in strongly oxidizing environments. It contains columbium and that is widely used in high-temperature environments in the presence of acids and alkalis.
It has amazing features such as very good welding and forming capabilities. These compression tube fittings provide higher temperature strength. This grade of steel is non-magnetic even in the annealed condition. And if you want to harden it then it can take place in cold working conditions. An important property of these fittings is, these have good creep strength. It has improved inter granular corrosion resistance as compared to its counterparts. And it has suitable temperature properties that make it apt for many industrial applications.
SS UNS S34700, S34709 Tube Fittings find application in marine corrosion areas, equipment for phosphoric acid and fertilizer industry, pollution control equipment. With that these are also used in the pulp and paper industry and the petrochemical industry. It has many advantages on its counterparts. These are a higher amount of carbon which gives it strength. But it remains subject to carburization and decarburization. Thus it becomes necessary to keep in a neutral environment. It finds its application in oil refinery equipment, heat exchangers, boilers & pressure vessels, chemical industries, paper, and pulp industries, food processing, etc. Many industries also use this grade of SS in furnace parts, industrial boilers and petrochemical plants. And we as a leading supplier standstill to fulfill the standard and custom made demands of our clients. We also perform important tests on these tube fittings.
| STANDARD | WERKSTOFF NR. | UNS | JIS | GOST | EN |
| SS 347 | 1.4550 | S34700 | SUS 347 | 08Ch18N12B | X6CrNiNb18-10 |
| SS 347H | 1.4961 | S34709 | SUS 347H | - | X6CrNiNb18-12 |
| Specifications | ASTM A182 / ASME SA182 |
| PTFE Standards | ASTM D1710, ASTM D3294 |
| Size | 1/16”OD to 2”OD, 2mm OD to 50mm OD |
| Thread | NPT, BSP, BSPT, UNF, ISO, SAE etc. |
| Pressure Rating | 6000 PSI for Stainless Steel, 300/1000/3000PSI for Brass |
| Grade | C | Mn | Si | P | S | Cr | Cb | Ni | Fe |
| SS 347 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 - 20.00 | 10xC – 1.10 | 9.00 - 13.00 | 62.74 min |
| SS 347H | 0.04 – 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 - 19.00 | 8xC – 1.10 | 9.0 -13.0 | 63.72 min |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1454 °C (2650 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
