上海本地镀锌方管价格震荡盘整厂家松动出货…方管上海镀锌方管市场价格稳中下调。市场方面，受早盘期卷持绿运行影响，部分方管厂家松动出货，现无花本钢主流规格售价在4120-4140元/吨；又由于宝武鞍钢对5月份镀锌方管期货价格下调150-200元/吨，镀锌方管指导价虽有所下调，但期现仍存在倒挂；此外目前大户亏损较为明显，方管厂家对后市还是选择以出货回笼资金…

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.

天津方管市场价格仍将维持震荡偏弱运行方管本周方管行情回顾：周初开市期螺保持高位震荡走势，但现货市场并不配合，终端 用户心态较为谨慎维持按需采购，中间商实际成交中亦以优惠让利出货为主。此后，期螺一路震荡下行，市场观望情绪浓厚，同时近期连续大雾天气加上钢坯下移因 素叠加导致市场成交比较惨淡，仅个别低价有成交，市场持续走弱。周中，期螺夜盘低位震荡，… 方管厂家反馈今日成交较昨日有一定回落方管本周乐从方管价格上涨，成交放量。回顾本周，期货市场强势上涨，现货市场方管厂家报价大幅拉涨，现乐从方管主流价格在3780元/吨左右，较上周大幅上涨150元。本周大户日均成交在 800吨左右，中户日均成交在400吨左右。方管厂家反馈今日成交较昨日有一定回落，主要是前几日成交尚可，短期补库已经到达目标所致。到货方面据了解…