黑铁管和镀锌钢管区别
钢管与铁管的区别在于碳含量，冶金工业通常分为黑冶金工业和有色冶金工业。
炉料多种属于黑冶金，主要包括铁、生铁、钢、铁合金等。铁碳合金含有少量的
合金元素和杂质，可分为：生铁――含C为2.0～4.5％钢――含C为0.05～2.0％熟
铁――含C小于0.05%钢由生铁再炼而成，机械强度和韧性高，耐热、耐腐蚀、耐磨
等特殊性能。铁在自然界中的含量非常丰富，占地壳元素含量的5%，在地球物质中
排名第四。铁很活泼，很容易与其它物质结合。铁与钢的区别：钢是钢与铁的总称。
钢和铁是不同的，所谓的钢，主要由铁和碳两种元素组成，一般碳和元素铁形成化
合物，称为铁碳合金。碳含量对钢的性质影响很大，碳含量增加到一定程度会导致
质的变化。由铁原子组成的物质叫纯铁，纯铁杂质很少。碳含量是区分钢铁的主要
标准。生铁含碳量大于2.0%；钢含碳量小于2.0％。生铁碳含量高，硬脆，几乎没有
塑性。钢不仅塑性好，而且具有强度高、韧性好、耐高温、耐腐蚀、易加工、耐冲击、
易提炼等优良的物化应用性能。
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