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可锻铸铁采用锌气氛退火新工艺后,退火周期虽然缩短到40h以内,但能源消耗仍然是很大的。我厂在此基础上又开始采用DH-1型可锻铸铁专用催化剂进行催化低温退火新工艺。该工艺是在国家规定的可锻铸铁的化学成分不变,不经孕育处理的条件下,靠DH-1催化剂自身强烈的石墨化作用,促使退火件石墨化核心迅速生成,继而当退火件达到700℃时,催化剂分解生成物对铸件起强
The malleable cast iron with zinc atmosphere after the new annealing process, although the annealing cycle shortened to 40h or less, but the energy consumption is still great. On the basis of this, our factory began to use DH-1 malleable cast iron special catalyst for catalytic low temperature annealing new process. The process is based on the state of malleable iron chemical composition unchanged, without concerted treatment conditions, rely on the DH-1 catalyst itself strong graphitization, prompt rapid annealing of graphitized core, and then when the annealing reaches 700 ℃ , The catalyst decomposition product becomes stronger to the castings