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Gayatri Tubes are a leading manufacturer and wholesaler of SS 347 / 347H Pipes.We manufacture stainless steel pipes in all grades and used the international standard for manufacture pipe. We manufacture pipes in all sizes and shapes and also keep stock in different dimensions, diameters, lengths, and thicknesses. The stainless steel grade 347 alloy is a combination of austenitic, chromium element with columbium. The elements prevent intergranular corrosion and also eliminate the carbide precipitation. The stainless steel 347H alloy has a higher carbon than 347 alloy. The addition of columbium increases its resistance property. The SS 347/347H pipes have many features like excellent corrosion resistance, resistance to crevice and pitting corrosion. The stainless steel 347 and 347H alloy used in high-temperature chemical process, heat exchanger, radiant super heaters, etc because of its specific property.
We export SS grade 347/347H pipes in all types like seamless, square, welded, round, rectangular, polished, electro polished, custom stainless steel pipe, thick wall, thin wall stainless steel pipes. The SS seamless 347/347H pipes have excellent mechanical property up to 1800 degrees F and it has chromium nickel alloy with austenitic alloy. Because of chromium alloy, the round pipes show high resistance to oxidation. The round SS 347 pipes have a high tensile strength in the annealed condition. The other features of stainless steel pipes are it requires less maintenance and easy to use, it is durable and reliable. The SS 347 and 347H welded pipes are used in spacecraft and aircrafts parts. The SS 347/347H pipes are used in many industries like power generation plants, chemical industries, seawater applications, heat treatment, offshore and oil drilling companies, petrochemical industries, etc. The electro polished pipes are used in architects and construction project because of its austenitic qualities. The SS 347H pipes are not easily affected by acids that’s why it is used in the chemical process.
When we manufacture our product, we conduct different types of tests for checking the quality of our product. We conduct- mechanical test, chemical test, PMI test, intergranular test, hardness test, toughness test, strength test, etc. We also provide the best packaging facility of our customers to protect our product during transportation.
| 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 A312, A358 / ASME SA312, SA358 |
| Outside Diameter | 6.00 mm OD up to 914.4 mm OD, Sizes up to 24" NB available Ex-stock, OD Size Steel Tubes available Ex-stock |
| Thickness Range | 0.3mm – 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
| Type | Seamless / ERW / Welded / Fabricated / CDW |
| Form | Round Pipes, Square Pipes, Rectangular Pipes |
| Length | Single Random, Double Random & Required Length |
| End | Plain End, Beveled End, Treaded |
| Outside Finish | 2B, No.4, No.1, No.8 Mirror Finish for Stainless Steel Pipes, Finish as per customer Requirements |
| Delivery Condition | Annealed and Pickled, Polished, Bright Annealed, Cold Drawn |
| EN 10216-5 | EN 10216 347 Seamless Steel Pipe, EN 10216-5 1.4550 Seamless Steel Pipes for pressure purposes |
| EN 10217-7 | EN 10217 347 Welded Steel Pipe, Steel EN 10217-7 1.4550 Welded Pipes for pressure purposes |
| 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 % |
