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Home > Stainless Steel > Stainless Steel 347/347H Heat Exchanger Tubing
Blundell Pipes and Tubes, based in Hamilton, New Zealand, is a reliable manufacturer and supplier of top-notch stainless steel tubing. They specialize in precision-engineered Stainless Steel 347 and 347H heat exchanger tubing, crafted for tough industrial applications that demand high-temperature strength, corrosion resistance, and long-lasting reliability. With a strong commitment to quality and compliance with international standards, Blundell Pipes and Tubes caters to various industries, including chemical processing, petrochemical, power generation, and marine engineering. Their tubing solutions are designed to ensure efficiency, structural integrity, and dependable performance in critical operations.
Stainless Steel 347/347H Heat Exchanger Tubing is manufactured from columbium (niobium)-stabilized austenitic stainless steel containing 17–20% chromium and 9–13% nickel. Grade 347 exhibits superior resistance to intergranular corrosion, particularly following welding, while 347H has a higher carbon content (up to 0.10%) for increased creep strength and high-temperature use. The tubing has a tensile strength of 515–750 MPa and a yield strength of approximately 205 MPa. Both grades exhibit mechanical stability and oxidation resistance in continuous service up to temperatures of 900°C.
Range : 10 mm OD to 50.8 mm OD
Outer Diameter : 6.00 mm to 101.60 mm
Wall Thickness : 0.70 mm to 8.00 mm
Length : up to 20 m (65.62 ft) Length & Customed Required Length
Specifications : ASTM A 213, A 268, A 269, A 789, Equivalent to ASME, EN, JIS Etc.
| Element | SS 347 | SS 347H |
| C | 0.08 max | 0.04 – 0.10 |
| Mn | 2.0 max | 2.0 max |
| Si | 1.0 max | 1.0 max |
| P | 0.045 max | 0.045 max |
| S | 0.030 max | 0.030 max |
| Cr | 17.00 – 20.00 | 17.00 – 19.00 |
| N | 10xC – 1.10 | 8xC – 1.10 |
| Ni | 9.00 – 13.00 | 9.0 -13.0 |
| Ti | 62.74 min | 63.72 min |
| Element | SS 347 | SS 347H |
| Density | 8.0 g/cm3 | 8.0 g/cm3 |
| Melting Point | 1454 °C (2650 °F) | 1454 °C (2650 °F) |
| Tensile Strength | Psi – 75000 , MPa – 515 | Psi – 75000 , MPa – 515 |
| Yield Strength (0.2%Offset) | Psi – 30000 , MPa – 205 | Psi – 30000 , MPa – 205 |
| Elongation | 35 % | 35 % |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Stainless Steel 347/347H heat exchanger tubing is an austenitic chromium-nickel alloy that’s stabilized with niobium (columbium) to prevent carbide precipitation during high-temperature use. This alloy typically features 17–19% chromium, 9–13% nickel, and 0.5–1% niobium, with 347H having a higher carbon content for improved strength at elevated temperatures. These tubes boast impressive mechanical properties, including a tensile strength of 515–750 MPa, yield strength of 205–275 MPa, and elongation of 35–45%. They also provide outstanding resistance to creep, oxidation, and intergranular corrosion, making them perfect for continuous high-temperature service.
Blundell Pipes and Tubes, one of the largest suppliers of Stainless Steel 347/347H Heat Exchanger Tubing in Hamilton, New Zealand, offers a comprehensive range of high-quality pipes and tubes suitable for various industrial applications. Their extensive inventory and commitment to exceptional service make them a go-to choice for stainless steel products in the region.
Commonly found in heat exchangers, boilers, condensers, chemical processing equipment, and petrochemical plants, Stainless Steel 347/347H tubing guarantees reliable performance under thermal stress and corrosive environments. Its durability, high-temperature stability, and corrosion resistance make it an excellent choice for demanding industrial applications that require long-lasting, high-performance tubing solutions.
| STANDARD | WERKSTOFF NR. | UNS | JIS | GOST | EN |
| SS 347 | 1.4550 | S34700 | SUS 347 | 08Ch18N12B | X6CrNiNb18-10 |
| SS 347H | 1.4878 | S34709 | SUS 347H | – | X6CrNiNb18-12 |
Stainless Steel 347/347H Heat Exchanger Tube is employed in applications where steady heat transfer performance under continuous exposure to heat, pressure, and corrosive environments is needed. Superheaters, boilers, reformers, condensers, and furnace items are typical uses. Grade 347 is suitable for welded constructions wherein sensitization should be avoided, whereas 347H is utilized in environments with elevated thermal loads and stress. These grades combine strength, thermal stability, and corrosion resistance that can withstand long service in harsh industrial operating conditions.
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