明日国内方管或将震荡运行为主现货供应偏紧方管价格窄幅震荡。今日小窄带开盘持稳，整体成交尚可，个别厂家出清日产。随着期货翻红，下游成交更加活跃，午间厂家纷纷追涨10元。经安复 产，小窄带资源充足。唐山窄带降10、中宽带持稳，周六上午发布11月钢铁…

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.

　　乐从市场价格偏弱运行厂家对后市行情不是很乐观…乐从冷轧市场价格明显下调，市场成交偏弱。年末将至，市场已经进入“半休眠”状态,市场成交情况不佳。据笔者了解，各企业及方管厂家年会近期陆续举办，进一步昭示“年味”的提前到来。同时近期终端采购意愿大幅减弱，…