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第两百三十二章 灌钢(1 / 2)

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生铁的熔点低,很快就熔化,渗入到熟铁里,两相融合,出来后,是为“灌钢”。

冶炼钢铁的技术,原本是春秋晚期诞生“块炼法”,到了汉代才有了百炼钢和炒钢技术。西方的科技树点得更慢,1744年,英国才探索出炒钢技术,他们甚至自夸,这是“动摇大地的技术”。

而公子卬教授给锜氏的灌钢,则比炒钢更加先进,是南北朝时期,北齐的綦母怀文发明的冶钢技术。灌钢技术在工业革命以前,是钢铁冶炼技术的巅峰之作。

古代钢铁冶炼最难的,就是控制碳含量,碳含量过多,武器、铠甲的韧性就一塌糊涂,刀砍过去,自己先折断了。碳含量若是低了,强度和硬度就不达标了,剑刃就捅不穿敌人的铠甲、头盔会被敌人的箭镞击穿。

炒钢最大的弊端就在于这里,一不小心就炒过了火,坯料被氧化烧损,再锻打增碳就费劲了。而每一车矿石的碳含量,在没有现代仪器的条件下,都是未知的,究竟炒多久,火候怎么控制,全凭匠人的手感。

而灌钢法则不然,生铁和熟铁的平衡,可以让钢材的碳含量波动控制在一个可以接受的范围之内。这种办法能耗低、效率高、返工少、成品质量稳定,除非公子卬的敌人能发明光学显微镜,否则不可能再有工艺上的突破了。

灌钢出炉后,公子卬就换到锻炼组讲授了。

风箱的驱动,燃烧的炉火,铁块被加热到“白热”状态,接下来公子卬趁热打铁,在锻台上有节奏地挥舞青铜的锤子,把灌钢打成薄片,然后在中间凿出凹槽,对折后再烧至白热,如此反复,就仿佛是揉面团一样。

灌钢被反复锻打,组织逐渐致密,成分摊得均匀,不能被烧软的杂质和铁的氧化物在一次次捶打下从表面剥落。公子卬挥汗如雨,钢铁的组织逐渐被锻得致密,晶界也获得加强,表面出现了锻态的纹理。

锻造的过程中,难免会损失铁料。钢有百炼,也只是说说而已。

不同的产品,需要锻炼的程度是不一样的。刀剑之类的兵器,只需要十斤炼成三斤即可,铠甲则要三斤炼成一斤,未来的铁炮则算是特种钢了,需要五六斤炼作一斤,火铳则更甚一筹,十斤炼作一斤。

“今天时间有限,只打造甲片。”公子卬擦了擦额头,火候差不多了,遂把铁料打成方片状,然后再趁热凿出一个洞。

“这是鳞甲的甲片,上面的小洞是为了穿绳而过,好把几十块甲片缝制到布面上。”

打造好的甲片被青铜钳子夹着送往淬火组。淬火组的人手最少,前面摆着两桶液体,一桶马尿,一桶油脂。

公子卬双手紧抓钳口,将烧红的甲片往马尿立一插,一阵白烟带着刺鼻的尿骚味直呛进鼻腔中,淬火工忍不住,皱着鼻子要别过脸去,滚滚白雾腾起如天边云挂。

“别扭过头!忍着,盯紧了钢铁!”公子卬面向腥臊的气体,不闪不避,大喝一声。

淬火工见公子卬身为一国上卿都能挺过来,自己也羞赧地扭过脸。

“注意看它的颜色!”淬火的目的,就在于赋予钢铁强度和硬度,让灼热的钢材迅速形成大量的马氏体。

公子卬准备了两种液体,准备来一个双液淬火,先用马尿把钢铁从奥氏体的温度区间快速冷却到马氏体的温度,之所以用马尿,是因为马尿中含有盐分,淬火时比水冷降温要更快,淬火后的钢质坚硬,强度更甚。

“记住这个颜色!”公子卬顶不住咳嗽了起来。钢材在不同温度下,辐射出不同颜色的光。公子卬凭借前世研究生期间的经验,判断应该尽入了马氏体的温度区间了,于是果断把甲片从马尿中抽出,浸入油脂桶里。

油冷的速度远低于水冷、尿冷,在这段时间里,钢铁中的奥氏体晶粒得以慢慢转变成更强更硬的马氏体。

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