购买方管时最实用的三种方管理论重量计算方…方管方管的三种理论重量算法：关于方管的重量的计算方法，总共有三种方式。第一种，就是用钢板算法，也就是，将一个正跟的方管展开，然后形成一个四片扁钢，然后在对扁钢进行计算。这种计算方法计算出来的重量，会与实际的方管的重量有比较大的差异，比实际的重量重。因为，这种方法会把中间重叠的部分的重量计算…

20日国内方管多数持稳运行，今日国内方管主稳个涨。今日145小方管开盘较昨涨20元/吨，主流厂家报3800元/吨，个别方管厂家资源被秒抢，整体市场成交偏弱。今日期货市场 持续高位持红运行。唐山普方坯市场开盘上涨，受其影响承压上行，但下游商家恐高情绪较浓，观望意图明显，因此多数企业涨后回落，今日午后期螺走高，挺价底 气明显增强，部分企业再次回涨。唐山355方管主流持稳，本周唐山方管轧线，部分复产，开工率有所上升，但上周个别轧线仅检修几天，并于近日复产，上周整 体产能利用率有所下降。目前唐山方管与唐山热卷价格倒挂加剧，部分热卷资源抢占方管市场下游。加之方管长期南下受阻，短期方管依旧承压。但受原料价格坚挺 影响，方管成本支撑强劲，加之下游开工情况尚可，社会库存小幅下降，供需矛盾稍有缓和；华东华南地区今日方管价格主稳个涨，市场成交整体平平，商家普遍心 态面尚可。从市场了解到，本地库存资源整体低位，加之淡季效应使然，需求表现偏弱，整体供需两弱难改。目前方管厂家手中多为前期老货，很少有囤货操作，基本 都是规避风险以出货为主。考虑到目前需求端依然偏弱，预计明天方管价格或将高温盘整运行。

On the 20th, most of the domestic managers have been operating steadily, and today the domestic managers have risen steadily. Today, 145 small square pipes opened 20 yuan/ton higher than yesterday, the mainstream manufacturers reported 3800 yuan/ton, individual square pipes manufacturer resources were stolen, the overall market turnover is weak. Today's futures market continues to operate at a high level. Tangshan's general billet market started to rise and was affected by it. However, downstream businessmen were afraid of high spirits and had obvious intention to wait and see. Therefore, most of the enterprises fell after the rise. In the late afternoon of today, the spiral went up, the underpriced gas increased significantly, and some of them rose again. The mainstream of 355 square pipes in Tangshan has been stable. This week, some of the rolling lines in Tangshan have been restarted, and the start-up rate has increased. However, last week, individual rolling lines were repaired for only a few days and restarted in recent days, and the overall productivity utilization rate decreased last week. At present, the price inversion between Tangshan Fangguan and Tangshan Hot Coil has intensified, and some hot coil resources have seized the downstream market of Fangguan. In addition, the long-term southward obstruction of the square pipe, the short-term square pipe is still under pressure. However, due to the strong price of raw materials, the support of square tube cost is strong, the construction situation downstream is still acceptable, the social inventory has decreased slightly, and the contradiction between supply and demand has eased slightly. In East and South China today, square tube price is rising steadily, the market turnover is flat as a whole, and the general mentality of businessmen is still acceptable. From the market, we know that the overall low level of local inventory resources, combined with the off-season effect, demand performance is weak, and the overall supply and demand weakness is difficult to change. At present, the manufacturer under the control of the party is mostly in the hands of pre-old goods, and there are few hoarding operations. Basically, the main way to avoid risks is to ship goods. Considering that the demand side is still weak at present, it is anticipated that the price of square tube will be reorganized and operated at high temperature tomorrow.

方管价格方面：唐山热轧方管(2.5*355mm)唐山瑞丰3720较昨稳；天津热轧方管 4.0*(480-570)天津荣钢3760较昨涨10；无锡热轧方管（2.5*355mm）中天3840涨20，莱芜热轧方管2.5* （232-355）莱钢3800涨10。

西安方管市场价格仍以窄幅震荡为主规格较为…方管西安方管市场价格小幅回落，市场成交一般。今日外围邯郸市场价格报3780元/吨，小幅上涨10元/吨。反观西安市场，热卷价格报3870元/吨，与上周价格相比小幅下跌10元/吨，整体成交一般。资源方面，主导钢厂到货量增加，据不完全统计本周陕西市场库存增0.5万吨至4万吨左右，市场缺货较少，规格较为齐全。需求方面，今日市场成 交… 成都方管市场价持稳运行厂家小幅累库方管成都方管市场价持稳运行。本地市场：今日成都市场方管持稳运行，据了解，本周社会库存小幅增长，符合市场预期，线材变化幅度不大，部分方管厂家小幅累库；终端需求基本停滞，节日氛围浓厚，预计明日成都市场方管价格盘整运行。方管价格方面，现达钢、威钢产Φ8-10mm高线市场价格为3960元/吨，持稳，成实产 Φ8-10mm高线市场价…