五百一十章：危险的圆环
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“现这，可以断定这里百分百，是那伙歹徒的窝。”
“这个金属圆环，也是从房间里现的？”叶青在手上不停把玩着这枚金属圆环，入手沉重感，让叶青明白这枚圆环采用了硬质合金制成，圆环的口径刚刚好可以套入大拇指中。
要不是指环另一边，有些切割痕迹没有打磨，叶青还真以为这是某位无聊人士，加工出来的金属扳指。
“在一堆杂物中翻出来地，这是现场唯一遗留的金属零配件，应该是他们疏忽了，没有清理掉的漏网之鱼。”章之潼有些伤脑筋地敲了敲额头：“我想来你这儿，找找隐藏在这枚金属圆环上的答案。”
叶青头，从拇指上摘下指环，对着阳光仔细观看。阳光下，叶青可以观察到这枚圆环内部，拥有比外表更明亮的镜面金属光泽。
“市场上的标准厚壁合金精密无缝管，外3o毫米，内185毫米。圆环是从精密无缝管的一端，用车床车刀，一圈一圈车断的。”叶青轻轻抚摸圆环较为粗糙的一边横截面：“这种无缝管，只有大型钢铁厂才能生产出来，主要用在高压流管道上。”
“这也是我们痕迹检验室好奇的地方，按常理说，这种无缝管，不都是直接用切割机切割吗？”
“我特意问过金属市场中，专做无缝管生意的商人。他告诉警方，所有店铺在按客户要求截断无缝管时，都拿专用切割机来加工。”
“歹徒们为何费时费力，用机床车断？”
“因为这里面，有一位上了年纪的大师傅。”叶青仔细观察圆环的截面，现内径表面，有一层o.2～o.3毫米厚，非常明亮的银色金属层，贴合在上。
也正是这道金属层，让叶青手中的这枚圆环，内径变得比外表更明亮。
“通常手艺越高的人，越有追求完美的强迫症，那些上了年纪，思想比较固化的人更是如此。”
“切割机切割无缝管，会产生大量地热，造成无缝管内径，有极其轻微，但不影响使用的热变形。这种热变形，在大师傅眼中，就是不可饶恕的误差，是侮辱手艺的废品。”
“所以追求品质完美的他们，宁愿用机床，用切削液一车断这根无缝管。”
解释完，叶青又指引章之潼，看向内径截面处，那层明亮的金属层。
“这应该是他们自己镀的一层铬，用来增加金属表面抗腐蚀性和耐磨性。在金属外表镀铬难度不大，但是在无缝管的内径里镀铬，就要很厉害技术了，尤其还镀的这么漂亮。”
接下来叶青的一句话，让章之潼立刻紧张起来。
“无缝管内部镀铬，他们一定在做枪，这枚圆环，是从枪管截下来多余的镀铬枪管。”
“没有膛线，口径又达到了185毫米，说明他们是在做霰弹枪。”说道这儿，叶青语气变得很严肃：“对于这帮人来讲，别说加工膛线，就算是全自动突击步枪，都能轻而易举地加工出来。”
“并且枪支质量与精度，还是非常好的那种。至于子弹跟射药，他们能调配出科学配比的铝热合剂，那做子弹更轻松，随便买化学品就能捣鼓出射药。”
章之潼郑重的头。
“巴素察那边公司，你们警方也协同一下，这伙歹徒真上钩，也尽量不要正面接触。”叶青将圆环重新还给章之潼，拍了拍她肩膀：“我再跟实验室那边打个招呼，让他们检测一下这里的金属成分，与市面上的同型号无缝管对比，找出是哪家钢厂生产的产品。”
“谢了，我的老同学。”章之潼也轻轻拍了拍叶青。
与章之潼挥手告别时候，叶青嘱咐道：“我先去参加茶话会，你们在后面行动中，一定要注意安全。”
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