The paper introduces the present situation, Charac-teristice, principle and typical process flow of SO_2 gassing hardening cold box process in our country.
文章介绍了我国目前SO_2吹气硬化冷芯盒制芯的现状、特点、原理及典型的工艺流程；
2
This paper investigates the rational decrease of hardening heating time of 45 steel parts in the box furnace.
本文研究了合理缩短45钢件在箱式炉中淬火加热时间。
3
Tip: Stick a slice of bread inside an opened box of brown sugar to keep it from hardening.