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因为想要用铁锹挖土的话,那就必须保证铁锹的厚度不能太厚,尤其是最前端,张岩记得,他爷爷为了更好的挖土,在下地之前甚至还要用磨刀石磨上几次。但生铁的延展性实在是太差了,以至于现在长弓氏族里熔炼出来的生铁,用来制做成短小且厚度不低的箭头,在有时射中比较坚硬的物体时尚且有可能出现直接断裂的情况,要是拿来打造成面积又大,厚度又薄的铁锹的话,那只怕挖不了两次土就要断成两截了。

尽管已经十分清楚长弓氏族所熔炼出的生铁有种种的毛病了,可张岩还是只能从铁上面下功夫,因为氏族之中的另一种金属青铜比铁还要不堪。

首先,虽然长弓氏族对铁的发现和使用比青铜要晚好几年,但因为地球是个铁含量远超铜的星球,所以,只用了短短的几年时间了,长弓氏族每年所获得的铁矿石就已经远超铜矿石了,所以,就算青铜可以拿来制造成青铜锹,长弓氏族也负担不起这么大的消耗。

其次,尽管铜是一种十分软的金属,但它的合金青铜却一点也不软,相反,正是因为青铜的硬度足够大,才会被拿来用作制造武器的材料。而且,青铜的延展性并不比生铁强多少,这一点,只要看看那些出土的青铜剑就能够知道了,哪怕是到了大秦统一六国,青铜武器已经发展到极致的时代,秦制的青铜剑也甚少有超过一米的,能有个八十多厘米就已经可以称为长剑了,而与其有着鲜明对比的则是汉朝时打造的,长度恐怖的已经快要达到两米之长的斩马剑,铁,以及铁的合金钢的延展性优势一览无遗。

用来挖土的锹,尽管最多不过三四十厘米长,但因为其在挖土时所用到的频率实在是太过频繁了,所以,打造锹的金属材料也必须有很强的延展性,否则,用不了几次,就会在使用过程中应声而断。

“哎,”在试过了用现有材料打造出来的青铜锹和生铁锹之后,张岩只能无奈的叹了口气,“亏我当初还觉得有个生铁拿来造个铁锅就齐活了,结果现在,还是得为了钢而头疼,真是,早知现在,当初就不那么懒了。”

离开了工坊的张岩再次将自己关到了房中,他要好好回忆一下,自己前世小时候在镇上铁匠铺中看到过的一切,看看能否从中找出炼出钢的可能。

但是一连想了两天,张岩还是一无所获,时间过去的太久了,他脑中连那炼铁的炉子是什么形状都已经记不清楚了,至于步骤的记忆就更是一片空白了。。。

明白继续困在屋中纯靠回忆已经不可能有什么成果的张岩,在第三天走出了房间,准备在氏族中转转,看看能不能寻找到替代的方案。

而看到他那愁眉苦脸的表情后,这几天每天都在门外等着他的张石与张山便知道了结果。

“阿岩,”看着张岩那愁眉苦脸的样子,张山走过来拍了拍他的肩膀,安慰着他,“想不出来也不要紧,你不要给自己太大的压力了,就算没法打造出来你画在兽皮卷上的那个名叫铁锹的挖土工具,我相信凭我们氏族这么多人的努力还是能够挖出规划好的水渠的。”

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