Stainless Steel 347 / 347H Pipes and Tubes, which are niobium-stabilized austenitic stainless steel products commonly used in applications with high temperature and corrosive conditions. These grades are produced to conform to ASTM and ASME standards and are extensively used in applications where intergranular corrosion resistance is an important requirement. Niobium addition helps to prevent the chromium carbide at temperatures of 450�C to 900 �C, which guarantees structural integrity even in service with long life. SS 347H also has more carbon content and provides greater creep and stress rupture strength, so it can be utilized in pressure bearing and heat intensive operations. These pipes and tubes have good cold-forming ability, oxidation resistance and dependability in the cyclic thermal operation.
Stainless steel 347 / 347H pipes and tubes come in seamless as well as welded versions which are made through extrusion and forming technologies, so as to provide a uniform thickness of the wall as well as dimensional precision. The seamless variants are made of solid billets, so that no welded joint is produced, and the tension and safety are enhanced, as well as the pressure-handling capacity. These are products that usually find application in petrochemical plants, refineries, power generation units, heat exchangers, boilers and chemical processing equipment. SS 347 / 347H pipes and tubes are better to be used in terms of both fabrication and long-term service given their superior mechanical properties and weldability. A further benefit is that 347 / 347H is dual certified enabling the product to be used in a wide variety of industrial applications.
| Specification Parameter | Technical Details & Range |
| Industry Standards | ASTM A312 / ASME SA312 |
| Seamless Pipe Size | 1/2" NB to 16" NB (Up to 24" NB available ex-stock) |
| Outside Diameter (OD) | 6.00 mm OD up to 914.4 mm OD |
| Thickness Range | 0.3 mm to 50 mm |
| Schedules | SCH 5, 10, 40, 80, 80S, 160, XS, XXS |
| Type | Seamless |
| Forms Available | Round Pipes, Square Pipes, Rectangular Pipes |
| Length | Single Random, Double Random & Custom Cut Length |
| End Type | Plain End, Beveled End, Threaded End |
| Outside Finish | 2B, No.1, No.4, No.8 Mirror Finish; Custom finishes available |
| Delivery Condition | Annealed & Pickled, Polished, Bright Annealed, Cold Drawn |
| EN 10216-5 (Seamless) | Grade 347 / 347H (1.4550) Seamless pipes for pressure purposes |
| EN 10217-7 (Welded) | Grade 347 / 347H (1.4961) Welded pipes for pressure purposes |
| Grade | C (%) | Mn (%) | Si (%) | P (%) | S (%) | Cr (%) | Cb (Nb) (%) | Ni (%) | Fe (%) |
| SS 347 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 - 20.00 | 10 x C - 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 | 8 x C - 1.10 | 9.00 - 13.00 | 63.72 min |
| Property | Imperial Value | Metric (SI) Value |
| Tensile Strength (min) | 75,000 psi | 515 MPa |
| Yield Strength (0.2% Offset, min) | 30,000 psi | 205 MPa |
| Elongation (in 50mm, min) | 35% | 35% |
| Hardness � Rockwell B (HR B), max | 92 | � |
| Hardness � Brinell (HB), max | 201 | � |
| Standard | UNS | Werkstoff Nr. | EN Designation | JIS (Japan) | GOST (Russia) |
| SS 347 | S34700 | 1.4550 | X6CrNiNb18-10 | SUS 347 | 08Ch18N12B |
| SS 347H | S34709 | 1.4961 | X6CrNiNb18-12 | SUS 347H | � |
| Nominal Size (Inches) | DN (mm) | OD (Inches) | OD (mm) | Wall Thickness (Inches) | Wall Thickness (mm) | Weight (lbs/ft) | Weight (kg/m) |
| 1/8 | 6 | 0.41 | 10.3 | 0.068 | 1.73 | 0.24 | 0.37 |
| 1/4 | 8 | 0.54 | 13.7 | 0.088 | 2.24 | 0.42 | 0.63 |
| 3/8 | 10 | 0.68 | 17.1 | 0.091 | 2.31 | 0.57 | 0.84 |
| 1/2 | 15 | 0.84 | 21.3 | 0.109 | 2.77 | 0.85 | 1.27 |
| 3/4 | 20 | 1.05 | 26.7 | 0.113 | 2.87 | 1.13 | 1.69 |
| 1 | 25 | 1.32 | 33.4 | 0.133 | 3.38 | 1.68 | 2.50 |
| 1 1/4 | 32 | 1.66 | 42.2 | 0.140 | 3.56 | 2.27 | 3.39 |
| 1 1/2 | 40 | 1.90 | 48.3 | 0.145 | 3.68 | 2.72 | 4.05 |
| 2 | 50 | 2.375 | 60.3 | 0.154 | 3.91 | 3.65 | 5.44 |
| 2 1/2 | 65 | 2.875 | 73.0 | 0.203 | 5.16 | 5.79 | 8.63 |
| 3 | 80 | 3.50 | 88.9 | 0.216 | 5.49 | 7.58 | 11.29 |
| 4 | 100 | 4.50 | 114.3 | 0.237 | 6.02 | 10.79 | 16.07 |
| 6 | 150 | 6.625 | 168.3 | 0.280 | 7.11 | 18.97 | 28.26 |
| 8 | 200 | 8.625 | 219.1 | 0.322 | 8.18 | 28.55 | 42.55 |
| 10 | 250 | 10.75 | 273.0 | 0.365 | 9.27 | 40.48 | 60.31 |
| 12 | 300 | 12.75 | 323.8 | 0.406 | 10.31 | 53.52 | 79.73 |
| 16 | 400 | 16.00 | 406.4 | 0.500 | 12.70 | 82.77 | 123.30 |
| 20 | 500 | 20.00 | 508.0 | 0.594 | 15.09 | 123.11 | 183.42 |
| 24 | 600 | 24.00 | 610.0 | 0.688 | 17.48 | 171.29 | 255.41 |
| Pipe Size | Schedule | OD (in) | Wall (in) | 100�F | 200�F | 300�F | 400�F | 500�F | 600�F | 700�F |
| 1" | 40 | 1.315 | 0.133 | 2205 | 2205 | 2205 | 2047 | 1902 | 1783 | 1703 |
| 1 1/2" | 40 | 1.900 | 0.145 | 1629 | 1629 | 1629 | 1512 | 1404 | 1317 | 1258 |
| 2" | 40 | 2.375 | 0.154 | 1371 | 1371 | 1371 | 1272 | 1182 | 1108 | 1059 |
| 3" | 40 | 3.500 | 0.216 | 1301 | 1301 | 1301 | 1208 | 1122 | 1052 | 1005 |
| 4" | 40 | 4.500 | 0.237 | 1102 | 1102 | 1102 | 1023 | 950 | 891 | 851 |
| 6" | 40 | 6.625 | 0.280 | 877 | 877 | 877 | 814 | 756 | 709 | 677 |
| 8" | 40 | 8.625 | 0.322 | 771 | 771 | 771 | 716 | 665 | 623 | 596 |
| 10" | 40 | 10.750 | 0.365 | 699 | 699 | 699 | 649 | 603 | 565 | 540 |
Metinox Overseas offers a comprehensive range of SS 347/347H pipe types to meet diverse industrial requirements.
SS 347/347H Welded Pipes
SS 347/347H Seamless Pipes
SS 347/347H High Wall Thickness Pipes
SS 347/347H Heat Exchanger Tubes
SS 347/347H ERW / EFW Pipes
SS 347/347H Coiled Tubing
The SS 347 / 347H pipes and tubes are produced in a well-controlled quality so that the pipes are of high strength, corrosion resistance and dependable performance at high temperature. These grades find general application in high pressure and high temperature service; critical service is preferred with seamless pipes.
The SS 347 / 347H pipes and tubes are very common in industries that require a high level of resistance to heat, corrosion and pressure. Niobium additions are very advantageous in terms of stabilization over precipitation of carbides and hence these grades can be used in high-temperature services.
Applicable in piping systems that experience high heat, cracking unit, and heat exchange lines where resistance to corrosion and thermal stress is vital.
Widely used in processing plants, reactors and piping of aggressive chemical and high-temperature fluids.
They are also suitable in superheaters, reheaters and boiler tubes because the material has a high creep strength and resistance to oxidation at high temperatures.
Usually employed in shell-and-tube heat exchangers and high-temperature heat exchangers that demand thermal stability and corrosion resistance.
The SS 347 / 347H pipes and tubes has amazing corrosion resistance strength which makes it a suitable choice for many chemical industries.
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The SS 347 / 347H pipes and tubes can be used continuously up to about 870�C and intermittently up to 925�C.
Yes, SS 347H can be welded without post-heat treatment in most applications due to its stabilized composition.
The main difference is carbon content�the SS 347H has higher carbon content than 347, giving it better strength at high temperatures.
SS 347 pipes are tested using hydrostatic or pneumatic tests, ultrasonic or eddy current tests, and chemical and mechanical tests.
They are commonly used in oil & gas, petrochemical, power plants, boilers, heat exchangers, and chemical industries.
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