What? According to the contract, it must be steel.
什么！根据合同规定，要有钢材制造。
Tool steel is generally purchased in the annealed condition. Sometimes it is necessary to rework a tool that has been hardened, and the tool must then be annealed. For.
退火。退火工艺的组成为把钢加热到一定温度并保持一段时间，通常再缓慢冷却。退火是为了产生均匀化从而建立起有一致的特有性质的标准均匀化组织。
Among some steel enterprises of our country, the dust removing system have been on operation for many years, there must be some problems more or less, and it affects production and environment nearby.
在国有大中型钢铁企业中，炼铁厂的除尘系统大部分都是运行了多年的系统，或多或少都存在一些问题，影响环境与生产。
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