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Home > Stainless Steel >Stainless Steel 347 and 347H EFW Pipes
Iris Pipes and Tubes, located in Cairo, Egypt, stands out as a top manufacturer and supplier of **Stainless Steel 347 and 347H EFW Pipes**. They provide high-quality piping solutions tailored for high-temperature and corrosive service applications. Known for their precision engineering and strict adherence to international standards, the company is dedicated to delivering products that are both durable and reliable. The **Stainless Steel 347 and 347H EFW Pipes** are specifically designed to resist oxidation, intergranular corrosion, and scaling, making them perfect for challenging industrial settings. Iris Pipes and Tubes caters to various industries, including petrochemical, power generation, chemical processing, marine, and oil and gas.
Stainless Steel 347 and 347H EFW Pipe is a high quality chromium-nickel alloy for corrosion resistance, high thermal strength and stability. The composition contains approximately 18% chromium, 9% nickel, and columbium added for increased intergranular corrosion resistance. Technical features include 75,000 psi tensile strength and 30,000 psi yield strength, making it suitable for high pressure applications Advantages include good oxidation resistance, weldability, and durability, making it ideal for use in chemical processing, power generation and heat exchangers , ensures delayed operation in dangerous environments.
| Specification | ASTM A358 / ASME SA358 |
| Specification | A / SA358 CLASS 1, A / SA358 CLASS 2, A / SA358 CLASS 3, A / SA358 CLASS 4, A / SA358 CLASS 5 |
| Grades | 304, 304L, 304H, 309S, 310S, 316, 316L, 316H, 317L, 321, 321H, 347, 347H, 904L ETC. |
| Type | EFW, ELECTRIC FUSION WELDED |
| Outer Diameter Size | Electric Fusion Welded / ERW- 8″ NB To 110″ NB (Nominal Bore Size) |
| Wall Thickness | Schedule 10 To Schedule 160 (3 mm to 100 mm Thickness) |
| Length | 01 Meter to 12.5 Meters, Single Random Length, Double Random Length And Customize Size. |
| Ends | Plain Ends / Beveled Ends |
| Delivery Conditions | As Rolled, Formed, Stress Relieved, Annealed, Hardened, Tempered |
| Coating | Electropolish, Mechanical Polish, Satin Finish, Passivated |
| Dimension | All Pipes Is Manufactured and Inspected / Tested to the Relevant standards including ASTM and ASME |
| Value Added Services | Draw / Expansion / Machining / Sand Blasting / Shot Blasting / Heat Treatment |
| Packaging | Loose / Bundle / Wooden Pallet / Wooden Box / Plastic Cloth Wraps / Plastic End Caps / Beveled Protector |
| Material Test Certificate | Manufacturer Test Certificate As Per EN10204 3.1, 3.2 / Laboratory Test Certificate From NABL Approved Lab. / Under Third Party Inspection Agency Like SGS, TUV, DNV, LLOYDS, ABS ETC |
| STANDARD | UNS | WERKSTOFF NR. | EN | JIS | GOST |
| SS 347 | S34700 | 1.4550 | X6CrNiNb18-10 | SUS 347 | 08Ch18N12B |
| SS 347H | S34709 | 1.4961 | X6CrNiNb18-12 | SUS 347H | – |
| 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 |
| Tensile Strength | Yield Strength (0.2%Offset) | Elongation | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | |||
| Psi – 75000, MPa – 515 | Psi – 30000, MPa – 205 | 35 % | 92 | 201 |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
These **Stainless Steel 347 and 347H EFW Pipes** are niobium-stabilized austenitic stainless steels, featuring around 17–19% chromium, 9–13% nickel, along with trace amounts of niobium and tantalum to prevent carbide precipitation. The 347H grade, with its higher carbon content, boosts creep resistance and high-temperature strength. Both grades boast impressive mechanical properties, such as high tensile and yield strength, good ductility, and outstanding oxidation resistance up to 900°C. Their unique composition ensures excellent weldability, structural stability, and long-lasting performance in thermal and corrosive environments.
| NPS Designator | Outside Diameter | Nominal Wall Thickness | ||||||||
| in. | mm | Schedule 5SA | Schedule 10SA | Schedule 40SA | Schedule 80SA | |||||
| in. | mm | in. | mm | in. | mm | in. | mm | |||
| 8 | 8.625 | 219.08 | 0.109 | 2.77 | 0.148 | 3.76 | 0.322 | 8.18 | 0.500 | 12.70 |
| 10 | 10.750 | 273.05 | 0.134 | 3.40 | 0.165 | 4.19 | 0.365 | 9.27 | 0.500B | 12.70B |
| 12 | 12.750 | 323.85 | 0.156 | 3.96 | 0.180 | 4.57 | 0.375B | 9.52B | 0.500B | 12.70B |
| 14 | 14.000 | 355.60 | 0.156 | 3.96 | 0.188B | 4.78B | … | … | … | … |
| 16 | 16.000 | 406.40 | 0.165 | 4.19 | 0.188B | 4.78B | … | … | … | … |
| 18 | 18.000 | 457.20 | 0.165 | 4.19 | 0.188B | 4.78B | … | … | … | … |
| 20 | 20.000 | 508.00 | 0.188 | 4.78 | 0.188B | 4.78B | … | … | … | … |
| 22 | 22.000 | 558.80 | 0.188 | 4.78 | 0.218B | 5.54B | … | … | … | … |
| 24 | 24.000 | 609.60 | 0.218 | 5.54 | 0.250 | 6.35 | … | … | … | … |
| 30 | 30.000 | 762.00 | 0.250 | 6.35 | 0.312 | 7.92 | … | … | … | … |
You’ll find **Stainless Steel 347 and 347H EFW Pipes** commonly used in applications that demand high-temperature strength, corrosion resistance, and reliability. Typical applications include heat exchangers, boiler tubing, superheaters, condensers, chemical process piping, and refinery systems. These pipes are well-suited for petrochemical plants, power generation units, and marine installations, where they often face thermal cycling, oxidizing conditions, and corrosive media. Their EFW (Electric Fusion Welded) construction guarantees precise dimensions, robust weld joints, and smooth internal surfaces, making them ideal for transporting fluids under high pressure and temperature.
Stainless Steel 347 and 347H EFW Pipes are widely used in various industries due to their exceptional resistance to corrosion and high temperatures The most common applications are chemical processing, where they lead to corrosive corrosion to the oil and gas industry, for the manufacture of pipelines and building materials; and power generation, especially in boilers and heat exchangers. They are also used in aerospace and automotive, as well as in the food and pharmaceutical industries, where hygiene and physical integrity are important Their reliability and durability make them ideal for harsh environments.
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