Common classification methods of boiler steel plate

In terms of materials, boiler steel plates can be divided into special carbon steel plates and low-alloy heat-resistant steel plates.

The materials used in boiler steel plates have strict control over chemical composition, especially harmful elements such as phosphorus and sulfur, and residual elements such as chromium, nickel, and copper. During smelting, good deoxidation and removal of non-metallic inclusions should be carried out to ensure good plasticity and toughness. The organizational structure is required to be uniform, and the grain size is controlled within a certain range (usually it is desired that the grain size is between 3 and 7). There are also strict requirements for surface quality and internal defects. In addition, the mechanical properties at room temperature and high temperature must be guaranteed.

According to the classification of the use environment, boiler steel plates can be divided into two categories: steel plates for room temperature and medium temperature pressure-bearing parts and steel plates for high-temperature pressure-bearing parts.

Boiler steel plates for room temperature and medium temperature (below creep temperature) are mostly carbon steel, including carbon steel, carbon-manganese steel, carbon-manganese-silicon steel, etc., that is, Q245R, Q345R, and ASME SA-515/SA-515M, SA-299/SA- 299M etc. It is mainly used to manufacture pressure-bearing parts such as boiler drum and header end cover below medium temperature.