The toughness may be well improved by postheat treatment which is large in energy consumption and long in working period.
后热处理可以较好地改
头的韧性，但存在耗能大、工时长等问题。
The toughness may be well improved by postheat treatment which is large in energy consumption and long in working period.
后热处理可以较好地改头的韧性，但存在耗能大、工时长等问题。
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