Dang Steel, a top-notch manufacturer and supplier based in Da Nang, Vietnam, specializes in high-quality Alloy Steel WP91 Pipe Fittings, crafted meticulously to meet ASTM/ASME standards. These fittings are designed to deliver outstanding strength, resist high temperatures, and ensure durability, making them perfect for applications in power plants, petrochemical facilities, and refineries. Thanks to cutting-edge manufacturing technology and strict quality control measures, Dang Steel guarantees precise dimensions, dependable performance, and a long lifespan. Their WP91 pipe fittings are popular in both domestic and international markets, especially for critical piping systems that require robust resistance to high pressure and temperature.
The Alloy Steel WP91 Pipe Fittings are made from P91 alloy steel, which includes chromium (8–9%), molybdenum (0.85–1.05%), vanadium (0.18–0.25%), niobium (0.06–0.12%), and carbon (0.08–0.12%), along with carefully controlled amounts of manganese, silicon, phosphorus, and sulfur. This blend of alloying elements results in impressive tensile strength (585–690 MPa), a minimum yield strength of 415 MPa, and excellent elongation (at least 20%). This combination provides exceptional creep resistance, stability at high temperatures, and corrosion resistance, making WP91 fittings ideal for challenging thermal and pressure environments.
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.
Alloy Steel WP91 Pipe Fittings find their place in high-temperature piping systems, including superheaters, reheaters, heat exchangers, and boilers in both thermal and nuclear power plants. They are also widely used in the petrochemical and refinery sectors for transporting steam, hot gases, and aggressive fluids. Common fittings like elbows, tees, reducers, caps, and flanges are all engineered to maintain their integrity under extreme conditions. With their durability, strength, and reliability, WP91 pipe fittings promise long-lasting performance in critical industrial applications where resistance to high pressure, temperature, and thermal fatigue is essential.
Dang 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 Da Nang, Vietnam.
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