Naing Steel stands as a trusted name in Naypyidaw’s industrial landscape, proudly serving as a dedicated manufacturer and supplier of high-performance components. We specialize in Alloy Steel WP91 Pipe Fittings, products engineered to meet the rigorous demands of modern high-temperature and high-pressure systems. Our commitment is to provide local industries with reliable, precision-crafted fittings that ensure integrity and longevity in even the most challenging operational environments, supporting the growth and infrastructure development right here in Myanmar.
The strength of WP91 lies in its sophisticated composition, which includes chromium, molybdenum, and vanadium, with a key addition of niobium. This specific blend gives the fittings exceptional mechanical properties, including high tensile strength and remarkable creep resistance. This means they can withstand immense, sustained pressure and extreme heat over long periods without deforming or failing, making them a fundamentally robust choice for critical systems.
Specifications : ASTM A234 / ASME SA234
Dimensions : ASME/ANSI B16.9, ASME B16.28, MSS-SP-43
Size : 1/8” NB TO 48” NB. (Seamless & 100% X-Ray Welded, Fabricated)
Type : Seamless / Welded / Fabricated
Bending Radius : R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom
Thickness : Sch 5s, Sch 10s, Sch 40s, Sch 80s, Sch 160s, Sch XXS
| Grade | C | Mn | Si | S | P | Cr | Mo |
| A234 WP91 | 0.08-0.12 | 0.3-0.6 | 0.2-0.5 | ≤0.02 | ≤0.015 | 8-9.5 | 0.85-1 |
| Grade | Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation % |
| A234 WP91 | ≥590 | ≥415 | ≥20 |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
These unique properties make Alloy Steel WP91 Pipe fittings indispensable in sectors where failure is not an option. You will find them at the heart of power generation plants, particularly in supercritical and ultra-supercritical boilers, and within the vast networks of petrochemical and fertilizer industries. They are essential for connecting piping that transports superheated steam and other aggressive media, ensuring safety and operational continuity where temperatures and pressures push the limits of conventional materials.
Naing 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 Naypyidaw, Myanmar.
Copyright 2025 Naing Steel. All rights reserved
