针对可锻铸铁退火周期长、石墨粗大、碳化物消除不彻底、退火工件力学性能低和使用寿命短的问题，对它的退火工艺进行了改进。
The heat treating process was improved for the malleable cast iron, in accordance with its long annealing period, coarse graphite, residual carbide, lower mechanical properties and limited serve life.
在扁平的半刚石中，D带较小，而石墨峰比粗大的半刚石中的要大。
In flat ballas the D-band is smaller and the graphite peak larger than in coarse ballas.
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