Application
Both stainless steel 347/347H round bar belong to austenitic stainless thermo-strong steels. 347 is a stable austenitic chromium steel characterized by the presence of niobium, which eliminates carbide precipitation and thus intergranular corrosion. In addition, Alloy 347 is stabilized by the addition of chromium and tantalum, and it provides higher creep and stress fracture properties than Alloys 304 and 304L. 347H is based on 347 with the addition of niobium, which makes it have excellent corrosion resistance in alkali, seawater and a variety of acid solutions. Especially at high temperatures, 347H exhibits good resistance to intergranular corrosion. In addition, it also has good welding properties and thermal strength properties. Due to its presence of chromium Cr, nickel Ni and niobium Nb, 347H has excellent resistance to intergranular corrosion and polysulfate intergranular stress corrosion, as well as high-temperature strength and plasticity. As a result, 347H is often used in large boiler superheaters, reheaters, steam pipelines, and heat exchanger fittings in petrochemical industries.
Description
- Strong corrosion resistance: both stainless steel bars contain niobium elements, which can effectively eliminate carbide precipitation, thus improving their resistance to intergranular corrosion.
- Excellent mechanical properties: they have high creep and stress fracture properties, and can maintain good mechanical properties in high temperature environments.
- Ease of machining and welding: both stainless steel bars are easy to machine and weld in standard shop fabrication practices, making them highly productive in the manufacturing process.
- Higher cost: as these two types of stainless steel bars contain more alloying elements, their manufacturing cost is relatively high.
- Higher requirements for welding process: as they contain more alloying elements, the requirements for welding process are also relatively high, requiring specific welding methods and techniques
- It is widely used in heat exchangers, superheater tubes, reheater tubes, steam tubes, and equipment and components in high-temperature environments, such as refineries, chemical plants, high-temperature furnaces, and heat exchangers in the petroleum, chemical, synthetic fibre, food, and paper industries..
Parameters
| Product Name | Stainless Steel 347/347H Round Bar |
| Standard | ASTM A276, ASTM A479, ASTM A182, ASTM/ASME UNS S34700 / S34709 |
| Finish | Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish |
| Specification | EN, DIN, JIS, ASTM, BS, ASME, AISI |
| Length | 2 meters – 7.5 meters, or Custom Cut Lengths |
| Outside Diameter | 4mm to 500mm |
| Shape | Round, Square, Hex (A/F), Rectangle, Billet, Ingot, HRAP, Bright, Forging Etc. |
| Application | manufacture of petroleum, chemical, gas separation and shipping container or other similar devices, such as all kinds of tower vessels, heat exchangers, torage tank and tank car, etc |
| Package | by bundles, each bundle weight under 3 tons |
