Marzouk Steel, headquartered in Tunis, Tunisia, is a trusted manufacturer and supplier of high-quality steel products, serving industries that demand performance, durability, and precision. Among its specialized offerings is Alloy Steel T91 Tubing, designed for high-pressure, high-temperature, and mechanically demanding applications. Manufactured using advanced technology and stringent quality control, T91 tubing provides consistent strength, dimensional accuracy, and long-term reliability. Marzouk Steel ensures that every T91 tube meets international standards, offering engineers and fabricators a material they can trust for critical systems in power generation, petrochemical, and industrial machinery where safety and performance are essential.
Alloy Steel T91 Tubing is a chromium-molybdenum-vanadium (Cr-Mo-V) alloy steel engineered for exceptional high-temperature strength, creep resistance, and thermal stability. Its chemical composition includes carbon, chromium, molybdenum, and vanadium, providing superior toughness, impact resistance, and fatigue strength. T91 tubing responds well to heat treatment, optimizing hardness, tensile strength, and overall mechanical performance. With high tensile and yield strength and excellent dimensional stability, T91 tubing maintains structural integrity and reliability under demanding operating conditions, making it ideal for industrial and high-performance applications.
| ASTM A213 T91 Specification & Standard | ASTM A213 T91, ASME SA213 T91 (with IBR Test Certificate) |
|---|---|
| SA 213 Gr T91 Specification | ASTM A213 & ASTM A209 BS/3059/ 90/ Part II/ 620 & 622 DIN/ 17175/ 13CrMo44 DIN/ 17175/ 10CrMo910 DIN/ 17175/ 15Mo3 |
| T91 Steel Tube Sch. & Swg. | 10 Swg., 12 Swg., 14 Swg., 16 Swg., 18 Swg., 20 Swg., 3.6 mm Thk |
| ASTM A213 T91 Tubing Size | 6.35 mm OD to 101.6 mm OD |
| ASTM A213 T91 Pipe Thickness | 3-12mm |
| ASME SA213 Gr T91 Material Origin | European, Japanese, Korean, US, Russian, Indian (Strictly No Chinese Material) |
| Craft | Cold rolled and Cold drawn |
| ASTM A213 T91 Tube Type | Seamless / ERW / Welded / Fabricated |
| SA213 T91 Steel Tube available in Form of | Round, Square, Rectangular, Hydraulic Etc. |
| ASTM SA213 T91 Tube Tolerance | Cold drawn pipe: +/-0.1mm Cold rolled pipe: +/-0.05mm |
| ASME SA213 Grade T91 Tube Length | Standard Double & In Cut length also. |
| ASME SA213 Gr T91 Tube End | Plain End, Beveled End, Treaded |
| ASTM A213 T91 Additional Testing | NACE MR 0175, NACE TM0177, NACE TM0284, HIC TEST, SSC TEST, H2 SERVICE, IBR, etc. |
| Specialized in |
|
| ASME SA213 Grade T91 Tube Application & uses | Seamless Ferritic ASTM A213 T91 Tubing for High-Temperature Service |
| Grade | C≤ | Mn | P≤ | S≤ | Si≤ | Mo |
|---|---|---|---|---|---|---|
| SA213 T91 Composition |
0.07~0.14 |
0.30~0.60 |
0.02 |
0.02 |
0.20~0.50 |
0.85~1.05 |
| Grade | Tensile Strength, MPa | Yield Strength, MPa | Elongation, % | Hardness, HB |
|---|---|---|---|---|
| ASTM A213 T91 Tubing | 585 min | 415 min | 20 min | 250 max |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
| Outside Diameter | OD Tolerance | WT Tolerance | Ovality Tolerance | Cut Length Tolerance |
| OD≤ 12, 7 mm | ± 0, 13 mm | ± 15 % | – | + 3, 18 mm, – 0 mm |
| 12, 7 mm < OD ≤ 38, 1 mm | ± 0, 13 mm | ± 10 % | max, 1, 65 mm | + 3, 18 mm, – 0 mm |
| 38, 1 mm < OD ≤ 88, 9 mm | ± 0, 25 mm | ± 10 % | max, 2, 41 mm | + 4, 76 mm, – 0 mm |
Marzouk Steel is a leading manufacturer and distributor of high-quality Alloy Steel T91 Tubing in Tunis, Tunisia. We provide top-grade steel materials and a diverse range of products, including Alloy Steel, Carbon Steel, Mild Steel, and Galvanized Steel. Our comprehensive inventory features Tubes, Pipes, Flanges, Pipe Fittings, Forged Fittings, Sheets, and Plates. Dedicated to on-time delivery and outstanding customer service, we source only the best raw materials to guarantee superior performance in industrial applications with demanding specifications. Reach out to us today for all your Alloy Steel T91 Tubing requirements!
Alloy Steel T91 Tubing is widely used in industries requiring strength, durability, and high-temperature resistance. It is commonly applied in boilers, heat exchangers, high-pressure pipelines, and critical components of power plants, petrochemical facilities, and industrial machinery. The tubing is designed to withstand extreme temperatures, high pressures, and cyclic loading while maintaining structural integrity and reliable performance. Engineers and fabricators rely on T91 tubing for applications where safety, efficiency, and long-term durability are essential. Its combination of toughness, thermal stability, and fatigue resistance ensures dependable operation in demanding industrial and mechanical systems.
Marzouk Steel is a leading manufacturer, supplier and exporter of high-quality Carbon Steel, Alloy Steel, Mild Steel and Galvanized Steel products. Our extensive product range includes Pipes, Tubes, Flanges, Pipe Fittings, Forged Fittings, Sheets and Plates, catering to various industries in Tunis, Tunisia.
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