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/>螺旋鋼管的外部執行標準為：GB709，內部執行標準為：GB/T1591-94。<br />類同于Q345B的命名方法。<br />由于執行標準的原因，此種鋼板允許負公差交貨。<br />Q345無縫鋼管是一種鋼管的材質。Q代表的是這種材質的屈服，后面的345，就是指這種材質的屈服值，在345左右。并會隨著材質的厚度的增加而使其屈服值減小。</span></p> </div> <div class="pager ks-clear"> <div class="previous fl"> <span>上一條：</span> <a href="http://www.housewife-cheating.com/2020/08/64.html">螺旋鋼管比較少見的熱處理方法</a> </div> <div class="next fr"> <span style="float: left;"> 下一條：</span> <a href="http://www.housewife-cheating.com/2020/08/62.html">螺紋維持強勢看漲格局或多頭思路操作</a> </div> <div class="clear"></div> </div> </div>  </div> <div class="clearfix"></div> </div> </div> <div class="clearfix"></div> <div class="tpl_footers" id="md_tpl_footers"> <div class="col-md-12"> <div class="ThemeFborder column column1"> <div class="friendLink" id="md_friendLink"></div> </div> <div class="column column1"> <div class="footers" id="md_footers"> <div class="footers-box Themebg"> <div class="footerBox clearfix"> <div class="text-center"> <div class="clearfix"> <div 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