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编辑同志:最近为了要求解决一项问题,这问题,牵涉到铸铁和焦炭的导磁性,现在提出,希给以解答:1.我们知道,纯铁在750°C以下是具有导磁性的,它的导磁性不但随温度的升高而降低,同样因含碳量的增加而减少。但有的书中说:铁内含矽等可以增加导磁性。一般铸铁内含碳约3．5%,矽2.2%和锰0．6%,它在各种不同温度下(自200℃至1700℃)的导磁性又是如何呢?
Editor’s Comrade: Recently, in order to request a solution to a problem that involves the permeability of cast iron and coke, it is now proposed that Xi give answers: 1. We know that pure iron is magnetically conductive below 750 ° C and that it The permeability not only decreases with the increase of temperature, but also decreases with the increase of carbon content. However, some books said: iron containing silicon can increase the permeability. The general cast iron contains about 3.5% carbon, 2.2% silicon and 0.6% manganese, which at various temperatures (from 200 ℃ to 1700 ℃) magnetic permeability is it?