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Home > Stainless Steel > Stainless Steel 347/347H Seamless Tubing
Blundell Pipes and Tubes, based in Hamilton, New Zealand, stands out as a top-notch manufacturer and supplier of high-quality Stainless Steel 347/347H Seamless Tubing. Renowned for its precision engineering and durability, the company produces seamless tubing that excels in resisting intergranular corrosion and performs exceptionally well at high temperatures. With cutting-edge production technology and strict quality control measures, Blundell Pipes and Tubes guarantees that each product adheres to international standards. These seamless tubing grades are perfect for tough industrial applications, such as petrochemical, power generation, aerospace, and chemical processing, offering reliable solutions that are both heat-resistant and corrosion-resistant.
Stainless Steel 347/347H Seamless Tubing is a niobium-stabilized austenitic stainless steel alloy with a chromium content of 17–20% and nickel content of 9–13%. Grade 347 offers resistance to intergranular corrosion when in and after welding, whereas 347H has increased carbon content up to 0.10% for better creep strength and longevity in elevated temperature service. These seamless tubes have a tensile strength of 515–750 MPa and a yield strength of approximately 205 MPa. The seamless structure increases pressure resistance, provides a smooth internal finish, and ensures consistent performance up to a temperature of 900°C.
Tube Range : 6.35 mm OD To 101.6 mm OD Guage: 25 SWG – 10 SWG
Outer Diameter : 3.00 mm – 219.10 mm
Wall Thickness : 0.40 mm – 12.70 mm
Schedules : 5, 10S, 10, 30, 40S, 40, 80, 80S, XS, 160, XXH
Length : Upto 30 meters, Custom Cut Lengths
Specifications : ASTM A213 / ASTM SA213
Types : Round, Square, Rectangle, Coil, “U” Shape, Hydraulic & Honed Tubes
| SS | 347 | 347H |
| Ni | 09 – 13 | 09 – 13 |
| N | – | – |
| Cr | 17 – 20 | 17 – 19 |
| C | 0.08 max | 0.04 – 0.08 |
| Si | 1 max | 1 max |
| Mn | 2 max | 2 max |
| P | 0.045 max | 0.045 max |
| S | 0.030 max | 0.03 max |
| OTHER | Nb=10(C+N) – 1.0 | 8xC min – 1.00 max |
| Grade | 347 / 347H |
| Tensile Strength (MPa) min | 515 |
| Yield Strength 0.2% Proof (MPa) min | 205 |
| Elongation (% in 50mm) min | 40 |
| Hardness | |
| Rockwell B (HR B) max | 92 |
| Brinell (HB) max | 201 |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
The composition of Stainless Steel 347/347H Seamless Tubing primarily includes iron, chromium, nickel, and niobium, with carefully controlled carbon levels—higher in 347H—to boost strength at elevated temperatures. The addition of niobium helps prevent chromium carbide precipitation, enhancing resistance to intergranular corrosion. From a mechanical standpoint, these tubing grades showcase impressive tensile strength, yield strength, toughness, and creep resistance when exposed to high temperatures. They also provide excellent weldability, thermal stability, and oxidation resistance, making them ideal for critical applications that demand consistent performance under prolonged high-temperature and high-pressure conditions.
Blundell Pipes and Tubes, one of the largest suppliers of Stainless Steel 347/347H Seamless 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.
Industries that require heat-resistant, corrosion-resistant, and high-strength piping solutions widely use Stainless Steel 347/347H Seamless Tubing. It’s commonly found in boilers, heat exchangers, superheaters, and chemical process equipment. The petrochemical and power generation sectors utilize it for steam lines, furnace components, and refinery pipelines. Additionally, the aerospace, marine, and automotive industries depend on 347/347H seamless tubing for structural components and high-temperature applications.
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
| BS | En | No | Name | ||||
| 347 | S34700 | 347s31 | 58G | 1.4550 | X6CrNiNb18-10 | 2338 | SUS 347 |
Stainless Steel 347/347H Seamless Tubing finds widespread applications in superheaters, heat exchangers, boiler tubes, reactor systems, and high-temperature chemical processing lines. The grade 347 is particularly suitable for welded systems where sensitization resistance is paramount, while 347H is used for continuous exposure at elevated temperatures with greater mechanical stresses. The tubes offer a reliable solution where thermal stability, corrosion resistance, and integrity are imperative for safe and efficient long-term operations.
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