<p>铜管的分类和执行标准<br /> 　　空调与制冷设备用无缝铜管 GB/T 17791-2007 　　电缆用无缝铜管 GB/T 19849-2005 　　导电用无缝圆形铜管 GB/T 19850-2005 　　磁控管用无氧铜管 GB/T 20301-2006 　　无缝内螺纹铜管 GB/T 20928-2007<br /> 紫铜管的重量计算公式<br /> 　　,紫铜就是纯铜： 纯铜呈紫红色，又称紫铜。纯铜密度为8.96，熔点为1083℃， 　　紫铜管的质量计算如下：G=8.96πδ（D-δ）/1000 　　G：质量kg δ：管壁厚mm D：管直径mm 　　适宜制造紫铜管铜材的牌号为T1、T2。 　　T1T2 　　T1的化学成份　Cu+Ag99.95%，P0.001%，Bi0.001%，Sb0.002%，As0.002%，Fe0.005%，Ni0.002%，Pb0.003%,Sn0.002%,S0.005%，Zn0.005%，O0.02%。 　　T2的化学成份　Cu+Ag99.95%，Bi0.001%，Sb0.002%，As0.002%，Fe0.005%，Pb0.005%,S0.005%。 　　导热率（λ）384/W·(m·K)-1 　　比热熔（C) 0.394/kj·(kg·K)-1</p> <p>镀锌管 Ф48*3.5 1.5寸*3.5 衡水、广州 5280 5280&nbsp;&nbsp; <br /> 镀锌管 Ф77.5*3.75 2.5寸*3.75 衡水、广州 5210 5210&nbsp;&nbsp; <br /> 镀锌管 Ф88.5*4.0 3寸*4.0 衡水、广州 5110 5110&nbsp;&nbsp; <br /> 镀锌管 Ф114*4.0 4寸*4.0 衡水、广州 5110 5110&nbsp;&nbsp; <br /> 镀锌管 Ф165*4.5 6寸*4.5 衡水、广州 5400 5400&nbsp;&nbsp; <br /> 镀锌管 Ф219*6 8寸*6.0 衡水、广州 5500 5500 </p> <p>公司成立于2006年，是一家专业经营304不锈钢板 <a style="word-spacing:0px;font:medium Simsun;text-transform:none;text-indent:0px;white-space:normal;letter-spacing:normal;background-color:#ffffff;orphans:2;widows:2;webkit-text-size-adjust:auto;webkit-text-stroke-width:0px;" href="http://www.q345bw.com/">Q345B角钢</a><span style="display:inline! 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