摘要
通过试验计算理论分析表明,5CrNiMo系列大型锻模用钢,超声探伤所遵循的GB/T11880—2008标准,对允许存在的缺陷尺寸的规定基本上是合理的;但在现有的基础上还可放宽1mm,即允许的最大当量Φ6可放宽到Φ7;个别分散的缺陷尺寸可以从Φ2、Φ4扩大到Φ5。
By test calculation theory analysis show that the 5 cmimo series of large forging die steel, followed by the ultrasonic flaw detection standard of GB/T11880 -2008, to allow the defects of the provisions of the size is basically reasonable; But on the basis of the existing can also relax 1 mm, namely Φ6 can be relaxed to allow maximum equivalent Φ7; Individual dispersed defect sizes can be expanded from ~2, Φ4 to Φ5.
关键词
模具钢
探伤
失效
die steel
ultrasonic testing
failure
