提出用低温长时间退火的方法改善其塑性，通过试验确定了退火工艺制度，使产品的变形性能达到了使用要求。
A method of annealing for a long time at low temperature can be used to improve the plasticity and make the products acceptable.
长时间扩散退火可有效地提高粉末锻造钢的韧性。
Toughness of powder forging steel can be increased efficiently by diffusion annealing in longer time.
发现长时间扩散退火可显著提高粉末锻件的冲击韧性。
It is found that shock toughness of powder forging part can be increased obviously by diffusion annealing for long time.
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