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Home > Stainless Steel >Stainless Steel 321 and 321H EFW Pipes
Iris Pipes and Tubes, based in Cairo, Egypt, stands out as a top manufacturer and supplier of **Stainless Steel 321 and 321H EFW Pipes**. They specialize in providing high-quality piping solutions designed for high-temperature and corrosive environments. The company has built a solid reputation thanks to its cutting-edge manufacturing processes, rigorous quality control, and dedication to meeting international standards. **Stainless Steel 321 and 321H EFW Pipes** are particularly valued for their impressive resistance to oxidation, intergranular corrosion, and scaling, making them perfect for tough industrial settings. Iris Pipes and Tubes caters to a variety of sectors, including petrochemical, power generation, chemical processing, oil and gas, and marine engineering, ensuring they deliver reliable and durable piping solutions.
Stainless Steel 321 and 321H EFW (Electric Fusion Welded) Pipe are primarily made of chromium (17-19%), nickel (9-12%), and titanium (stabilizer) The main difference between the two is that 321H has a high carbon content for high temperature strengths ( 0.04-0.10%). Both features provide excellent corrosion resistance, especially in high humidity. They have good mechanical properties such as tensile strength (515 MPa), yield strength (205 MPa), and resist stress corrosion cracking. Advantages include durability, weldability and oxidation resistance, making it ideal for heat exchangers and chemical processes.
| 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 |
| SS 321 | S32100 | 1.4541 | X6CrNiTi18-10 | SUS 321 |
| SS 321H | S32109 | 1.4878 | X12CrNiTi18-9 | SUS 321H |
| Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti |
| SS 321 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 5(C+N) – 0.70 max |
| SS 321H | 0.04 – 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 4(C+N) – 0.70 max |
| 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 % | 95 | 217 |
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 321 and 321H EFW Pipes** are titanium-stabilized austenitic stainless steels, featuring around 17–19% chromium, 9–12% nickel, and small amounts of titanium to help prevent carbide precipitation. The 321H variant has a higher carbon content, which enhances its strength at high temperatures and improves creep resistance. Both grades boast excellent mechanical properties, such as high tensile and yield strength, good ductility, and outstanding oxidation resistance up to 900°C. Their unique composition guarantees structural stability, weldability, and consistent performance even in thermally and chemically aggressive 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 321 and 321H EFW Pipes** commonly used in applications that demand high-temperature performance, corrosion resistance, and durability. They are often found in heat exchangers, boilers, superheaters, chemical process piping, and refinery systems. Thanks to their EFW (Electric Fusion Welded) construction, these pipes feature robust weld joints, smooth internal surfaces, and precise dimensions, making them ideal for transporting fluids under high pressure and temperature. The blend of thermal stability, corrosion resistance, and mechanical strength ensures they provide a long service life and dependable operation in challenging industrial applications.
Stainless Steel 321 and 321H EFW Pipes are widely used in high-temperature corrosion environments due to their excellent thermal resistance and mechanical strength They are commonly used in air and spacecraft exhaust systems from inside, furnace components and heat oxidizers. In the chemical and petrochemical industries, these pipelines are ideal for process equipment, heat exchangers and raw materials. The high carbon content of 321H makes it suitable for high temperature applications, such as super heaters, boilers and pressure vessels, where high tensile strength and resistance to thermal stress are required.
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