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                        <div class="msg"><pre>目前全球紧固件主要用于汽车工业、电子工业和建筑及维修工业。其中，汽车工业是最大的用户，需求量约占紧固件总销量的23.2％；
其次是维修工业市场和建筑工业，约占紧固件总销量的20％；第三是电子工业，约占紧固件总销量的16.6％。
从行业归属来看，紧固件行业在2002年之前是单独的行业小类，但2003年开始按照新的《国民经济行业分类》，
“紧固件、弹簧制造”合并成为了一个行业小类，由于弹簧制造企业的数量和经济总量都比较小，将其从紧固件行业中加以剔除的技术难度较大，
所以在实际分析紧固件行业的发展情况时，某些数据不将弹簧制造企业加以剔除。“紧固件、弹簧制造”所对应的行业中类是“通用零部件制造及机械修理”，对应的行业大类是“通用设备制造业”。
随着我国振兴装备制造业进程的不断推进，产业升级速度不断加快，我国紧固件行业与世界各国经济的融合不断加速，这对我国紧固件行业的产品质量、技术水平提出了越来越高的要求，
紧固件行业是否能够不断提升其整体水平不仅关系到能否缩短我国汽车、重大技术装备与国外先进水平的总体差距，还关系到包括人民生活在内的整个国民经济的发展水平</pre></div>
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                        <div class="title"><a href="/article/detail/id/126.html">螺栓的强度等级？</a></div>
                        <div class="msg"><pre>钢结构连接用螺栓的强度等级分3.6、4.6、4.8、5.6、6.8、8.8、9.8、10.9、12.9等10余个等级
螺栓强度等级标号有两部分数字组成，分别表示螺栓材料的公称抗拉强度值和屈强比值。例如，性能等级4.6级的螺栓，其含义是：
1、螺栓材质公称抗拉强度达400MPa级；
2、螺栓材质的屈强比值为0.6；
3、螺栓材质的公称屈服强度达400×0.6=240MPa级性能等级10.9级高强度螺栓，其材料经过热处理后，能达到：
1、螺栓材质公称抗拉强度达1000MPa级；
2、螺栓材质的屈强比值为0.9；
3、螺栓材质的公称屈服强度达1000×0.9=900MPa级
螺栓强度等级的含义是国际通用的标准，相同性能等级的螺栓，不管其材料和产地的区别，其性能是相同的，设计上只选用性能等级即可。强度等级所谓8.8级和10.9级是指螺栓的抗剪切应力等级为8.8GPa和10.9Gpa
8.8公称抗拉强度800N/MM2 公称屈服强度640N/MM2 
一般的螺栓是用"X.Y"表示强度的， 
X*100=此螺栓的抗拉强度， 
X*100*（Y/10）=此螺栓的屈服强度 
（由于按标识规定：屈服强度/抗拉强度=Y/10） 
如4.8级 
则此螺栓的 
抗拉强度为：400MPa 
屈服强度为：400*8/10=320MPa</pre></div>
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