Submerged nozzle must be preheated before casting. Now, burning the coal gas is the usual preheating method.
浸入式水口在浇钢以前必须进行充分预热，利用燃烧的煤气烘烤水口是常用的预热烘烤方式。
Submerged nozzle must be preheated before casting. Now, burning the coal gas is the usual preheating method.
浸入式水口在浇钢以前必须进行充分预热，利用燃烧的煤气烘烤水口是常用的预热烘烤方式。
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