扫描电镜观察表明，加入铝，可抑制锻后空冷条件下先共析网状碳化物的析出；
The microstructure analysis by SEM showed that the precipitation of netlike proeutectoid carbide has been inhibited during air cooling after forging due to Al addition to the UHCs.
本钢种无需经过任何热处理，经锻轧后空冷就能达到较好的强韧性。
The steels can obtain better strength and toughness by subsequent air cooling after hot forging or rolling without any heat treatment.
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