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碳是钢铁中必然的一种元素,它主要以碳化物存在于钢铁之中,只有少数几种钢中才有极少数的游离碳存在。钢铁中的硫是由冶炼钢铁的原料带来的,是极有害的杂质,它使钢具有热脆性,并减低钢的耐磨性和化学稳定性。硫在钢铁中多半以硫化锰形态存在,如锰含量很低则过量的硫与铁结合为硫化铁。当含有碳硫的试样在氧气流中经过高温燃烧后,试样中的碳,不论是游离碳还是化合碳
Carbon is a necessary element of steel, it exists mainly in the steel in the carbide, only a handful of steel only a very small number of free carbon exists. Sulfur in steel is brought about by the raw materials used to smelt steel, which is a highly detrimental impurity that renders the steel hot and brittle and reduces the wear resistance and chemical stability of the steel. Sulfur in steel mostly in the form of manganese sulfide exists, such as low manganese content is excessive sulfur and iron combined into iron sulfide. When a specimen containing carbon and sulfur is subjected to high temperature combustion in an oxygen stream, the carbon in the specimen, whether free or compoundized carbon