rimmed ingot ; rimming ingot
沸腾钢缺陷缩头锭 recedingmetal
所以，在钢锭模内析出的气体没有沸腾钢多，但又在钢锭头产形成足够的气泡抵消大部分钢的收缩。
So less gas is. given off in the mould than with rimming steel, but enough bubbles form at the top of the ingot to counteract most of the shrinkage.
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