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(1) 为什么会存在成品化学成分的允许偏差这里涉及到两个概念“熔炼分析”和“成品分析”。熔炼分析是指在钢液浇注过程中采取样锭, 然后进一步制成试样并对其进行的化学分析。分析结果表示同一炉或同一罐钢液的平均化学成分。GB/T 699—1999《优质碳素结构钢》中规定的钢
(1) Why there are permissible deviations in the chemical composition of the finished product There are two concepts involved here: “smelting analysis” and “finished product analysis”. Smelting analysis refers to the ingot taken in the molten steel pouring process, and then further made of the sample and its chemical analysis. Analysis results show the same furnace or the same tank average liquid chemical composition. GB / T 699-1999 “high-quality carbon structural steel” specified in the steel