第518章 周密准备!高炉炼铁与坩埚炼钢!
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第518章周密准备!高炉炼铁与坩埚炼钢!(第1/2页)
朱高炽在李铁匠等一众老匠人的陪伴下,开始巡视起了这些高炉。
李铁匠正是先前对朱高炽提出质疑的老匠人,打了一辈子铁,从洪武开国进铁厂当学徒,到后来掌炉炼铁,经他手炼出的铁能装满十座库房,对炼铁炉的脾气、特性摸得比自己的孩子还熟。
当初朱高炽提出拆旧炉建新炉时,他是第一个站出来反对的,怕的就是新炉不靠谱、砸了匠人的饭碗;如今却是最积极参与建炉的人,从高炉的高度、容积,到炉壁的厚度、出铁口的位置,都带着老匠人反复测算,生怕出半点差错。
而这些高炉也是他领着百名老匠人一起商议规划,然后带着铁厂内的匠人铸就而成——先是根据朱高炽给的图纸,敲定“高七丈五尺、容积二十立方米”的核心尺寸;再细分分工,老匠人负责画样、监工,年轻匠人负责搬砖、砌炉,连最基础的夯土都要求“每夯三层必浇水压实”;遇到“如何固定石墨石板”“怎么设计鼓风接口”这类难题,李铁匠就召集老匠人连夜开会,有时争论到后半夜,才敲定最优方案。
这些高炉普遍高七丈五尺,比铁厂外的老槐树还高半截,站在炉下往上看,炉顶几乎要钻进云层里;高炉容积约二十立方米,能一次性装下三十石铁矿、十石焦炭,比这个时代最多只能装五石料的土炉大了四倍,是当之无愧的“高炉”。
以往土炉炼一炉铁要六个时辰,按李铁匠的估算,这新高炉只需三个时辰就能炼一炉,且一炉铁的产量抵得上旧炉三炉,效率翻了六倍不止。
石墨不算什么稀奇东西,山东、山西的矿坑里都能挖到,民间甚至有人拿它当“黑石头”写字、画画,只不过这个时代的人只知其表、不知其里,没发现它耐高温的特性。
在朱高炽眼里,这玩意绝逼是眼下最好的耐火材料——不仅能承受上千度的高温灼烧,还能减少铁水与炉壁的粘连,避免铁料损耗,至少朱高炽现在受限于技术,只能先开发它这一个核心用途,至于做铅笔芯、导电材料这些后世用法,眼下还没条件实现。
其实若只是建造一座炼铁的小高炉,直接使用粘土筑造,或者用红砖砌都没很大问题,之前津铁坊的小炉就是这么建的,勉强也能炼铁。
但关键是朱高炽希望提高它的使用寿命——旧土炉最多用半年就会被高温烧裂,得反复修补,既耽误工时又浪费材料。
于是在高炉内衬中,他特意要求大幅度使用石墨:从炉膛内壁到出铁口,都镶嵌了一层厚厚的石墨石板,连炉顶的排烟通道都铺了石墨碎料。
这种现代炼钢炉才用的高级耐火材料,在明初被大规模用在高炉里,就是希望这些高炉能用上三五年不用大修,既能稳定产量,又能减少后续的维护成本。
李铁匠摸着高炉内壁的石墨石板,手指能感受到石板的光滑与坚硬,忍不住道:“殿下,这黑石头真是奇物!咱们试过用它垫在土炉里,烧了三天三夜都没裂,比粘土耐烧多了。有这东西衬着,这高炉别说用三年,就是用五年,我看都没问题!”
朱高炽点头:“只要咱们后续好好维护,定期检查石墨的损耗,这些高炉就能一直为咱们炼好铁。将来水师要造巨舰、铸火炮,都得靠这些高炉撑着。”
一旁的老匠人也纷纷附和,语气里满是自豪——他们亲手建的高炉,用了“奇物”石墨,不仅规模大,还耐用,将来定能成为大明最好的炼铁炉,而他们这些建炉的匠人,也能跟着名留青史。
(本章未完,请点击下一页继续阅读)第518章周密准备!高炉炼铁与坩埚炼钢!(第2/2页)
然后就是坩埚炼钢了,这是比之炒钢法更为先进的炼钢方式——炒钢法只能靠人工搅拌控制温度,钢的成分不稳定;而坩埚炼钢能将铁矿与焦炭密封在坩埚内,在高温下充分反应,炼出的钢纯度更高、成分更均匀,韧性和强度都远超炒钢。
可惜的是,这种工艺对耐火材料要求极高,普通粘土、红砖根本承受不住坩埚炼钢时的高温,很容易开裂导致钢水泄漏,好在朱高炽从山东找到了石墨,正好解决了这个关键难题。
这些石墨经过粉碎,与少量粘土混合调成糊状,再由匠人们按照固定尺寸塑胎成型——有的做成能装十斤铁料的小型坩埚,有的做成能装五十斤铁料的大型坩埚,塑好的胎体要先阴干七日,再放到专门的窑子里,用千度高温烧制十几个小时,待胎体完全硬化、石墨与粘土紧密结合,那就是耐高温、抗腐蚀的石墨坩埚了。
烧好的石墨坩埚通体乌黑,敲起来声音清脆,匠人用它装着红热的铁料试验,哪怕灼烧两个时辰,坩埚也没有丝毫开裂,完全能满足炼钢需求。
这从古至今的炼钢工艺,分为炒钢、百炼钢和灌钢三种,各有局限。
炒钢实际上就是“炒铁成钢”,用炒铁炉将生铁加热到半熔融状态,再靠工匠用铁勺反复搅拌,让生铁中的碳含量降低,最终得到熟铁或少量中低碳钢。
但这种工艺全凭工匠经验控制,温度高了会把铁炒成废渣,温度低了碳含量降不下来,炼出的钢质量极不稳定,大多又冷又脆,强度根本达不到兵器、火炮的要求。
现如今大明军中的制式火器,比如迅雷铳、洪武大炮的炮管,基本上全都是用这种炒钢炼出的熟铁制造——熟铁韧性差、强度低,火炮发射时承受不住火药爆炸的冲击力,用不了几次就会炸膛,炸伤炮手的事屡见不鲜,当然不足为奇了。
百炼钢则是在炒钢的基础上进一步加工,以炒钢作为原料,将其加热到赤红状态后,反复折叠锻打,有时还会用数种成分不同的铁料反复叠锻,通过锻打排出铁中的杂质,让钢的组织更致密。
但这种工艺极其复杂,一块百炼钢往往需要锻打数百次,耗费大量工时,成本更是炒钢的十倍不止,根本不适合大规模生产,只能用来制造宝刀、宝剑这类精密兵器。比如演义中常出现的“百炼刀”,那就意味着是削铁如泥的宝刀,寻常士兵根本用不起。
灌钢法在沈括的《梦溪笔谈》中有明确记载:“世间锻铁所谓钢铁者,用柔铁屈盘之,乃以生铁陷其间,封泥炼之。锻令相入,谓之团钢,亦谓之灌钢。”
简单来说,就是将熟铁(柔铁)弯曲盘绕,中间嵌入生铁,外面用泥密封后加热,让生铁熔化后渗入熟铁中,再通过锻打让两者融合成钢。
这种工艺比百炼钢效率高些,但依旧依赖人工锻打,且每次只能炼制小块钢料,同样不适合大规模工业化生产,最多只能满足小规模兵器制造的需求。
朱高炽现在要的,则是坩埚炼钢,是能实现大规模工业级别的炼钢!
他要的不是一次炼几斤、几十斤钢,而是一次炼几百斤、几千斤钢,能批量供应水师造巨舰、军工铸火炮、民间造农具的钢,只有这样,才能支撑大明的工业发展,才能为远征美洲提供足够的物资基础。
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