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换热机组管子与管板材料的硬度差

  通常换热机组管板材料硬度应比管子材料硬度高泛亚电竞官网,这样在胀管过程中管板基本上不产生塑性变形,只是管子产生塑性变形,依靠管板弹性变形的收缩得到强度高、密封可靠的胀接泛亚电竞官网。如16Mn管板与10号换热管之间的胀接是合适的泛亚电竞官网,但与20号换热管胀接时泛亚电竞官网,20号管则应进行管端软化退火(当有应力腐蚀要求时,应整根进行软化处理或换成10号换热管)泛亚电竞官网;假若换热机组管子材料硬度高,管板管孔被胀大泛亚电竞官网,发生塑性变形泛亚电竞官网,管子是部分弹性变形,则胀接质量反而下降泛亚电竞官网,所以一般选用硬度差在HB30~50范围内的管板与管子泛亚电竞官网。

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