Experimental results show that stepped aging process not only enhances mechanical properties but also improves resistance against stress corrosion of the alloy.

试验结果表明，分级时效工艺在提高合金机械性能的同时，还能使合金抗应力腐蚀性能得到明显改善。

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However, stepped aging, which relaxes internal macro-stress under lower temperature then ages under higher temperature, can avoid longitudinal cracks effectively.

分级时效处理，低温下先让合金内部的宏观应力松弛，再在较高温度下时效，可有效地避免棒材纵向开裂。

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Our country has entirely stepped to the rank of aging countries.

我国已步入老龄化国家的行列。

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