短期北京方管市场价格窄幅震荡较昨日持平北京方管市场价整体下行。10日昌黎普碳方坯含税出厂3380元，较昨日持平。唐山钢坯价格意外维稳，期货震荡尾盘翻红。目前方管厂家库存压力暂且不大，中间采购需求阶段出现，10家大户出货量合计8100吨，较昨日微增…

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.

　　明日国内方管市场价格趋稳偏强运行厂家压力减轻…方管市场价格趋强整理。唐山早盘期螺高位震荡运行，钢坯连涨两波累涨30，双双提振市场信心，北方重点城市唐山方管钢厂指导价格全面拉涨20-30元。因唐山连续限产唐山库存处 于低位，方管厂家压力减轻，目前唐山方管缺货…