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A387 Grade 11 Class 2, as a chromium - molybdenum - based heat - resistant pressure vessel steel, plays a key role in the high - temperature industrial field. Conceptually, it follows the ASTM standard and is developed for working conditions with high temperature, high pressure, and corrosion challenges, and is an important material to ensure the reliable operation of equipment.

In terms of characteristics, it has excellent high - temperature mechanical properties. Compared with Class 1, there are differences in composition control and other aspects, so that it can still maintain good strength and stability in a higher temperature range (adaptable to working conditions around 550 °C). The creep resistance and thermal fatigue performance are more prominent, and it can effectively cope with the impact of temperature cycle changes. In terms of corrosion resistance, the corrosion resistance to a variety of chemical media is further optimized, and the welding performance is good. However, due to the composition characteristics, the control of process parameters during welding requires a little higher to ensure the joint performance.

The processing process has a rigorous procedure. In the steelmaking process, the proportion of alloy elements such as chromium and molybdenum needs to be accurately controlled, and advanced smelting processes are used to ensure component uniformity; during rolling, according to the plate specification requirements, the shape is formed by hot rolling or cold rolling, and the internal structure is improved at the same time. The heat treatment adopts the normalizing + tempering process. The normalizing temperature, tempering time and other parameters need to be strictly adapted to the characteristics of Class 2 to give full play to its high - temperature performance advantages. The subsequent quality inspection covers chemical composition analysis, mechanical property testing, non - destructive testing, etc., to comprehensively ensure the steel quality.

The application scope is concentrated in high - end equipment in the petrochemical, power and other industries with more stringent requirements for high - temperature performance, such as ultra - high - temperature hydrogenation reactors, high - temperature superheater headers, etc. These equipment are in an environment with extremely high temperature, high pressure, and complex media for a long time. A387 Grade 11 Class 2 builds a solid foundation for the long - term safe operation of the equipment with its enhanced high - temperature performance and corrosion resistance, and is the preferred material for the manufacturing of high - end high - temperature pressure - bearing equipment.