SH3405-2012标准碳素钢、合金钢无缝钢管理论重量表SH3405-2012标准碳素钢、合金钢无缝钢管理论重量表公称直径DN外径mm公称壁厚和平端无缝钢管的理论重量表STDXSXXS1521.32.771.273.731.627.472.552026.72.871.693.912.207.823.642533.43.382.504.553.249.095.454048.33.684.055.085.4110.159.555060.33.915.445.547.4811.0713.448088.95.4911.297.6215.2715.2427.68100114.36...