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对空冷贝氏体钢５Ｃｒ３Ｍｏ２ＶＮｂ进行扩散退火，可减轻其晶内成分偏析，使组织均匀，强度与韧性明显提高。采用的扩散退火工艺为１２５０℃×５ｈ，炉冷至室温，淬火、回火后，其性能指标完全可以达到热作模具钢的要求，为用铸钢代替锻钢制作模具的可能性提供了依据
The air-cooled bainitic steel 5Cr3Mo2VNb diffusion annealing can reduce the composition segregation within the crystal, the organization uniform, strength and toughness improved significantly. The diffusion annealing process used is 1250 ℃ × 5h, the furnace cooled to room temperature, quenching and tempering, the performance index can meet the requirements of hot work die steel, cast steel for the possibility of using instead of forging steel provides a basis