黑鐵管和鍍鋅鋼管區(qū)別
鋼管與鐵管的區(qū)別在于碳含量，冶金工業(yè)通常分為黑冶金工業(yè)和有色冶金工業(yè)。
爐料多種屬于黑冶金，主要包括鐵、生鐵、鋼、鐵合金等。鐵碳合金含有少量的
合金元素和雜質(zhì)，可分為：生鐵――含C為2.0～4.5％鋼――含C為0.05～2.0％熟
鐵――含C小于0.05%鋼由生鐵再煉而成，機(jī)械強(qiáng)度和韌性高，耐熱、耐腐蝕、耐磨
等特殊性能。鐵在自然界中的含量非常豐富，占地殼元素含量的5%，在地球物質(zhì)中
排名第四。鐵很活潑，很容易與其它物質(zhì)結(jié)合。鐵與鋼的區(qū)別：鋼是鋼與鐵的總稱。
鋼和鐵是不同的，所謂的鋼，主要由鐵和碳兩種元素組成，一般碳和元素鐵形成化
合物，稱為鐵碳合金。碳含量對(duì)鋼的性質(zhì)影響很大，碳含量增加到一定程度會(huì)導(dǎo)致
質(zhì)的變化。由鐵原子組成的物質(zhì)叫純鐵，純鐵雜質(zhì)很少。碳含量是區(qū)分鋼鐵的主要
標(biāo)準(zhǔn)。生鐵含碳量大于2.0%；鋼含碳量小于2.0％。生鐵碳含量高，硬脆，幾乎沒(méi)有
塑性。鋼不僅塑性好，而且具有強(qiáng)度高、韌性好、耐高溫、耐腐蝕、易加工、耐沖擊、
易提煉等優(yōu)良的物化應(yīng)用性能。
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