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第一百五十三章 石墨化退火(1 / 2)

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见陈雨终于认可了炮型,公沙·德西劳也松了一口气。他想了想,决定把这种炮唯一的短板告诉雇主。

“很高兴您能认可这种火炮。但是不得不很遗憾地告诉您:由于目前钢铁材质的问题,这种炮不得不用青铜铸造。而铜这种材料的匮乏程度想必您也是心知肚明的……”

陈雨本来兴致勃勃,听到这话冷静了下来。德西劳的话换个角度来理解,就是可以小批量制造,但是大规模量产会受到材料来源的限制。

明知是徒劳,他还是问了一句:“用铁不行吗?”

德西劳回答:“小炮用青铜,重炮用铸铁,这是之前就得到您批准的方案。虽然用铁也能铸造这样的小炮,但是目前条件下炼出的铁,无法胜任高频率的炮击强度和温度,比青铜材质更容易炸膛,出于对士兵生命负责的考虑,个人觉得还是用铜为好。”

陈雨默然。他对这种两百斤小炮的定位是步兵支援武器,射击频率肯定远远高于用于港口和城池防御的要塞炮,如果轻易就炸膛,那就违背了设计这种炮的初衷。可是铜料的贵重和获得难度也是无法回避的问题,目前千余人的队伍还好,将来要是扩军,上哪里找这么多铜来铸炮,难不成收集铜钱融化吗?这种成本远远超出了他的预期。

就在他陷入两难之际,人群中的林继祖站了出来,对陈雨说:“大人,也许我有办法解决这个难题。”

陈雨眼睛一亮:“真的吗?”

林继祖转头问德西劳,“德先生,生铁铸炮的最大问题就是太脆,对不对?”

德西劳点点头:“生铁的特性是硬而脆,抗拉性太差,高温和高膛压下非常容易炸膛。另外,材质太硬就意味着可加工性太差,内壁基本上没法切削镗光,粗糙不平、气孔很多,导致气密性变差,推力不够,炮弹的威力也会随之下降。而铜的延展性和可加工性都比生铁强,是目前最合适的材质。”

陈雨插了一句:“说到延展性和可加工性,制作火铳的熟铁也够软啊,为什么不能锻造大炮?”

没等德西劳回答,在一旁观摩的铳坊管事林阿福接上话头:“大人,熟铁用来打制铳还成,炮就不行了。一来,人力捶打不了这么厚的铁块,铁皮卷成铳还勉强可以,炮就别想了;二来,熟铁太软,硬度还不如铜,最多做铳管,用来做炮管,只怕没几炮就要变形……”

德西劳赞善地说:“林的说法很专业,听说他是这里最优秀的铁匠。事实基本上就是他说的那样,熟铁做成火枪是锻造,而厚重的炮管是无法使用人力锻造的,所以只能融化成铁水之后用模具铸造。另外,相对柔软的熟铁承受不住火炮的膛压,很容易变形,使用寿命极短……”

陈雨对林继祖说:“那么你用什么办法解决这个难题?”

林继祖指了指自己的父亲林阿福:“我爹就行。”

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