The situation of steel materials being used for pressurized components of supercritical boilers has been presented

and problems such as the operation reliability and localization of steel materials currently used for boilers etc. being analysed. It is believed that the steel pipes with large diameter having sufficient strength and good welding property are suitable materials for fabricating high-temperature headers

high-temperature pipelines

and desuperheaters of supercritical boilers; through design and manufacture of two 900 MW supercritical boilers. it shows that our country has basically grasped the physicochemical property

technological property

and fabricating technique of supercritical boilers; steel pipes of small or large diameters having steel grade in accordance with ASME in USA should be fully selected and used for supercritical boilers. At the same time

study on problems of new steel sorts used for over-supercritical boilers

such as TP347 HFG

super 304H and HR3C should be strengthened.