铸件

请问球铁试棒在标距外断裂,数据有效吗?

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请问球铁试棒在标距外断裂,数据有效吗?
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试棒断标距外数据无效
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以下4中情况试棒结果是无效的:1、试样在试验机上装卡不当或试验机操作不当;2、试样表面有铸造缺陷或切削加工不当;3、拉伸试样在标距外断裂;4、试样断口上存在明显的铸造缺陷。
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