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介绍了低成本的第二代单晶合金ＤＤ３９８，该合金综合性能优良，其１００ｈ持久强度的承温能力比第一代单晶合金ＤＤ３提高３０℃，而拉伸性能、持久性能、抗氧化和抗热腐蚀性能达到了国外广泛应用的第二代单晶合金的性能水平。ＤＤ３９８合金组织稳定，单晶工艺性能良好，且具有低成本的优势。
The second generation single crystal alloy DD398 with low cost is introduced. The alloy has excellent comprehensive properties. Its 100h long lasting strength is 30 ℃ higher than that of the first generation single crystal DD3. Tensile properties, ductility, oxidation resistance, The hot corrosion resistance has reached the performance level of the second generation single crystal alloy widely used abroad. DD398 alloy is stable, single crystal process performance is good, and has the advantage of low cost.