New generation creep-resistant steels, their weldability and properties of welded joints: T/P92 steel

One of the important materials used in the building of modern power units is T/P92 steel, developed in Japan in 1990, and also known as NF 616. In comparison with P91 steel, this alloy contains some tungsten (up to 2%), less molybdenum (at 20.6%) and microscopic traces of boron. At the temperature of 600 °C, its resistance to creep is about 30% higher. The main application for small diameter, thin walled tubing made of T92 steel is found in super heaters, and secondary super heaters in the power stations operating at supercritical parameters. The thick walled large diameter piping in P92 steel is used for fresh and superheated steam in the chambers and pipelines that work at extreme temperatures and pressure (Table 1).