国内方管市场价格或盘整趋弱厂家成交较为一…方管本周方管市场价格稳中调整。截至12月13日，国内重点城市16-25mm普板均价3788元(吨价，下同)，较上个交易日下跌2元，较上周同期上涨17元，较上月同期上涨88元。本周黑色系市场表现强势，持续拉涨，带动方管现货小涨趋强，不过，周后期市场表现差强人意，价格呈现回落态势。周初，虽期货拉升，但部分区域重污染…

让现已加工成制品方管具有较小曲折度还得依靠机械东西校直机来完结。所以为了消除方管曲折，一切方管都需求经过冷校直。方管曲折是因为轧机调整不妥，轧制时残留的剩余应力以及因为沿管子截面和长度上冷却不平等缘由形成的。因而，不行能从轧机直接得到很直的管子，只要通过冷校直管子的曲折度才干满意技能条件的规则。

To make the square tubes of the products processed now have a small degree of flexibility, we have to rely on the mechanical straightening machine to complete the straightening machine from east to west. Therefore, in order to eliminate the twists and turns of square tubes, all square tubes need to undergo cold straightening. The bending of square pipe is caused by improper adjustment of rolling mill, residual stress during rolling and unequal cooling along the section and length of pipe. Therefore, it is impossible to get very straight pipes directly from the rolling mill. Only by cold straightening the pipe's flexibility can the rules of skill conditions be satisfied.

校直的根本道理即是使方管进行弹塑性曲折，由大的曲折度成为小的曲折度，因而钢管在校直机内有必要遭到重复曲折。而钢管重复曲折的程度主要由校直机的调整所决议。

The basic principle of straightening is to make square pipe elastic-plastic twist, from large twist to small twist, so it is necessary for steel pipe to be repeated twist in straightening machine. The degree of repeated twists and turns of steel pipe is mainly determined by the adjustment of straightening machine.

影响校直质量的要素许多，如原管的曲折度，钢管尺度和材料校直机型式，调整参数等。

There are many factors affecting the quality of straightening, such as the bending degree of the original pipe, the size of the steel pipe and the type of straightening machine for materials, and the adjustment of parameters.

本周上海方管市场价格小幅下跌厂家出货成交…方管本周上海方管市场价格小幅下跌，随着唐山相关部门发布《8月份大气污染防治管控方案》文件，对八月份的环保限产工作作出 了初步指示，长流程钢厂按环保评级对高炉和烧结等工序进行限产，调坯轧材企业分AB轮轮流生产的方式停限产，综合来看此次文件传达的环保限产力度大概率将 不及七月，预计8月份产量环比上升。期货方面：螺纹… 昆明方管价格或将弱势运行厂家下调出厂价格…方管昆明方管价格除昆钢价格外，其他方管厂家价格下跌50元/吨（吨价，下同）。价格方面，现玉昆、仙福、呈钢 Φ8-10mm高线4020元，较昨日下跌50元；玉昆、仙福、呈钢Φ18-25mm方管4070元，较昨日下跌50元；玉昆、仙福、呈钢 Φ8-10mm方管4100元，较昨日下跌50元；由于周边外省资源价格普遍较低，昆明市场受到外省资源冲击，导致大…