第二百零五章 宝刀（第1 / 1页）
这个时候，还要让钢水在炉子里自然冷却，直到第二天早上，韩端才让牛信将瓷锅从炉子里端出来，并取出里面的钢锭。
这块钢锭的含碳量在077左右，也就是后世所称的共析钢。
它在红热状态缓冷至727c恒温下，生成多边形珠光体组织，其中铁素体和渗碳体呈片状平行排列。
优质碳素结构钢和碳素工具钢都包含这种珠光体组织。
无论硬度强度还是加工性能，共析钢都超过了这个时代任何一种钢材。
“老牛将这块钢锭拿去，打造一把长刀出来，不用再锤炼，加热后直接打造就行。”
在兵器作坊里，韩端向牛信吩咐道。
不用继续锤炼，速度自然是快得很，半个时辰不到，一柄将近八尺长的长刀便告成型。
银白色的刀身在炉火的照映下闪耀着光芒，但却没有百炼刀叠锻过后特有的纹理，看上去光秃秃一片，卖相并不好看。
但山阴来的的老铁匠们都相信这是一把宝刀，因为他们的郎主曾经创造了不少的奇迹。
接下来便是淬火回火，共析钢的淬火与百炼钢又有不同。
刀剑淬火的目的，是为了提高硬度，但提高硬度的同时又会变脆，因此刀剑只需在刀刃局部淬火，以确保刀身部位的韧性。
而共析钢淬火后形成坚硬的马氏体，再在600度左右的炉中回火，就会形成回火索氏体，变得更加坚硬有韧性，而不会像其它刀剑那样发脆。
幸亏作坊里的淬火槽够长，要不然长达八尺的直刀根本放不进去。
淬完火后，将刀又送回刚熄灭的炉火中回火一个时辰。
时间一到，牛信便急不可耐地将刀从炉中夹了出来，等到完全冷却，便拿到水车带动的砂轮上淋着水打磨开锋。
数十名工匠将牛信围在中间，都想看看这把长刀到底能达到什么成色。
就连屠翁也站在牛信身后不断催促。
砂轮粗磨之后，还要用磨刀石细磨，然后再安装上软木刀柄。
刚一完成，牛信便竖着这柄比他还高的长刀，急切地向韩端问道：“郎主，用什么来试刀？”
“有没有打造好的长刀？”韩端走上前来，众工匠连忙退到一旁。
“有。”不等牛信招呼，就有一名铁匠跑去拿了一柄长刀过来，韩端接到手里，笑着问道：“老牛，你都有一年多没打铁了，还能不能耍得动长刀？”
将近三十斤重的长刀，相当于后世十三四斤，这样重的刀，普通人就算能挥几下，恐怕也不能持久。
但牛信却哈哈笑道：“郎主小看我老牛！我跟师父挥了十多年大锤，这柄刀重量和大锤不相上下，我怎么可能耍不动？”
“既然耍得动，那就来试试。”韩端也是哈哈一笑：“看仔细了！”
“郎主尽管来！”
话音刚落，众人便见两道刀光闪过，两柄长刀瞬间便在空中相碰，只听得“叮当”一声，众人仔细一看，却是半截刀身掉到了地上。
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