综述了当前世界各国重点研究的700℃超超临界火力发电机组锅炉用水冷壁、过(再)热器、主蒸汽管道及高温出口集箱用高温材料的显微组织、性能现状及研究进展。对于水冷壁可选用 HCM12钢和 Inconel 617合金作为其高温段备选材料；Inconel 740合金改良后制得的 Inconel 740 H 合金因具有优良的持久蠕变强度和焊接性能，应是高温过(再)热器、主蒸汽管道及高温出口集箱的主要备选材料。今后的研究应通过实践进一步验证上述材料的高温持久强度及蠕变强度，并探索合理的热加工工艺，提高其热加工性能和焊接性能，降低材料的成本。
Nowadays,the materials research for 700 ℃ ultra-supercritical coal-fired unit is focused on the component materials with high-temperature strength all over the world.The microstructures,mechanical properties and research progress of the materials used for water wall tube,superheater/reheater tube,main steam pipe and high-temperature steam header in the unit are introduced.HCM12 steel and Inconel alloy 61 7 can be used for high temperature section of water wall tube.Inconel alloy 740 H is produced by modification of Inconel alloy 740 and can be used to fabricate superheater/reheater tube,main steam pipe and high-temperature steam header due to its high creep rupture strength and excellent welding performance.In the future research,it is important to verify the high temperature creep rupture strength and creep strength of as-mentioned alloys in practice;meanwhile the optimum heat working process should be studied to improve the heat working property and welding performance and reduce the cost of material.
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