第二百五十二章 精钢
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生铁足够，炉里的铁水还有更大用处。更多小说ltxs520.com猎文网
工匠关上用于浇铸的沟槽，打开通向炒铁炉的沟槽，炒铁炉窝在地平线之下，铁水便自己流进已然烧了小半个时辰的炒铁炉。
这种炒铁炉外观像个功夫茶的茶杯，但杯底和杯壁是中空的，铁水装在杯中，煤炭在杯子底部燃烧，火焰通过拱形茶杯璧，把热量反射到杯内对铁水加温，然后从烟囱里抽走。
烟囱根部从炉子延伸出来的那一段，就埋在铁水流入的沟槽底下，起到预热铁水的作用。
加热炉中铁水，对入炉沟槽上的铁水预热，为吹入底部燃烧室的空气加温，火焰一路挥余热，将自己的能量最大化利用，最后才变成一缕烟气消散在空中
房看着这浓浓烟尘，心底打鼓，不知道会不会把长安变成世界上第一个雾都？
燃料和铁水完全隔离，就可以使用煤炭了，直接挖出来就用，比需要在窑里烧制的木炭成本低多了，反正不和铁接触，硫、磷等有害物质不会掺进铁水里。
煤炭可以炼焦，据房岿知，焦炭炼铁那才是最正宗的方式，只不过眼下实在时间紧迫，也顾不得木炭的成本高昂。
此时铁水经过加热，已经泛起星星点点的亮光——那是混在铁水中的细小炉渣
工匠开动了搅炼设备，炉顶的大圆盘慢慢旋转，带动熟铁棍子在铁水里转圈搅动，铁水翻滚，显然比人力的作用强上百倍。
高炉炼出的生铁水一经搅动，碳和空气中的氧在高温下剧烈反应，产生二氧化碳，放出大量的热，铁水开了锅，气泡咕嘟咕嘟的冒，把炉渣推到炉边堆积起来。
生铁熔点比纯铁低，当碳与氧气结合，生铁水中的碳含量逐渐降低，它的熔点就逐渐提高，于是炒铁炉中的铁水逐渐变得浓稠，由清汤到酱汁，由酱汁到果冻
最后聚成一个个外形很可爱的铁团儿，呈熔融状。
停下搅拌，工匠们用长嘴钳子夹起一块铁团儿，放到锻锤下面敲打。
丁当当一阵响，铁团中的碳元素以单质石墨的形式被挤了出来，和内部的细悬滓、表面的氧化铁碎屑一起，因为高温而在空气中化作了点点火星。
这个锻打没什么技术含量，只是为了除去杂质，工艺非常简单，就用钳子夹着在锻锤下随便敲打几下，熟铁在高温下很软，所以造型容易。
挨过敲打的所谓“熟铁”，其实并不是现代教科书意义上的熟铁。国际冶金界没有生、熟铁这种说法，现代钢铁工业上，含碳量汹o.o2的国内称熟铁，国外称纯铁，质地非常柔软；含碳量在o.o22.11的叫做钢；含碳量在2.11以上的国内称作生铁，国外称铸铁。
而在我国民间，以高炉直接从铁矿石炼出来的称作生铁，以经过炒铁炉或者炒钢炉炒炼的为“熟铁”。
这种“熟铁”的碳含量，和炒炼时间成反比，炒得久，碳氧化得多，铁的碳含量越低，反之亦然，所以其碳含量能在o.o11.5之间腐，包含了现代意义上的“纯铁”和“钢”。
所以古代炒铁等于炒钢。
只不过工艺很难把握，炒出的成品以铁和中低碳钢为主，狗屎运能得到一两块高碳钢——那概率和彩票中奖没差多少
钢铁产品中，碳含量越低越柔软，越高则越脆、硬。
中低碳钢柔软，用来制作刀剑则不锋利，古人也把它视作“熟铁”，只能制作农具等普通铁器。只有高碳钢的韧性、硬度、强度符合制作武器的需求，那才是“钢”
碳含量的高低决定了钢铁的软硬，于是通过被锻锤敲打时的表现，有经验的铁匠能够分辨哪块是软铁，只能打制锄头，哪块能好钢，可以锻造锋锐无比的宝刀宝剑。
至此，房俊的历史任务全部完成，可以安心谢幕了
能不能出来好钢，他也不知道，他的知识水平只能让他懂得原理，却从无实际操作的经验，这一方面，他甚至比不上这些打了一辈子铁的唐朝工匠。
“实实z快来看，我打的这块可能是钢！”
一个薪弟在那边哇哇大叫，把闲着的人全都吸引过去。
王玄亲自过去，长嘴钳子夹起那块铁，放在锻锤下当当当敲了几下，沉声说道：“还差得远咧，打一把菜刀还成，做锛子凿子也勉强，宝刀宝剑不成！”
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