Alloy Steel Heavy Wall Elbow

Alloy Steel Heavy Wall Elbow is a 90 ° or 45 ° elbow made of alloy steel with a wall thickness far exceeding that of conventional pipe fittings. It is designed for high pressure, high temperature, and strong corrosion conditions and is widely used in the petrochemical, power, and energy fields.

Its core materials are chromium molybdenum alloys (such as 2.25Cr-1Mo, 9Cr-1Mo), nickel based alloys (such as Inconel 625), etc. The alloying elements significantly enhance the high-temperature strength, creep resistance, and corrosion resistance of the material. For example, 2.25Cr-1Mo material can withstand a pressure of over 30MPa for a long time at 593 ℃.

The manufacturing process is mainly based on hot forging and hot pressing: the alloy steel pipe blank is heated to 800-1200 ℃, forged and bent through a mold, and then subjected to quenching and tempering heat treatment (quenching+high temperature tempering) to eliminate internal stress, ensuring uniform wall thickness (deviation ≤ 5%), and the mechanical properties of the bent part are consistent with the base material.

Compared to ordinary elbows, its advantage lies in its thick walled design (usually ≥ Sch80, even XXS grade) that can withstand extreme pressure; The alloy composition endows excellent high-temperature stability and hydrogen corrosion resistance; The overall structure has no weld defects and is suitable for transporting high-risk media such as hydrogen and high-temperature steam.

Application scenarios include: nuclear power plant primary pipeline (nickel based alloy thick walled elbow), refining and hydrogenation unit (Cr Mo alloy elbow), supercritical power plant boiler pipeline (9Cr-1Mo elbow), etc. The product must comply with standards such as ASME B16.9 and GB/T 12459, and pass ultrasonic testing and water pressure testing (1.5 times the design pressure) before leaving the factory.