1956年第四季度,我厂为完成一批粉碎机高锰钢碾圈(图一)的生产任务,克服缺乏适当热处理加热设备的困难,曾经过摸索,自行设计和建造丁一种临时性的直接加热炉,基本上满足了这种产品的热处理技术要求。碾圈的成分为:碳1.2～1.4％,锰12～14％。铸造金相组织(图二)的特点为:(a)粗大的1号或大于1号晶粒度;(b)网状碳化物沿晶粒边界析集。热处理的要求是加热至1050～1100℃(Ac_3+ In the fourth quarter of 1956, in order to complete the production tasks of a number of high-manganese steel mill rings for pulverizer (Figure 1), I have tried to design and construct a temporary Direct heating furnace, basically to meet the heat treatment of this product technical requirements. Rolling ring components: carbon 1.2 ~ 1.4%, manganese 12 ~ 14%. Cast metallurgical structure (Figure II) is characterized by: (a) coarse No. 1 or greater than grain size; (b) mesh carbides along the grain boundary aggregation. Heat treatment is required to heat to 1050 ~ 1100 ℃ (Ac_3 +