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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.

本周天津方管市场价格以稳为主厂家谨慎操作…方管本周天津方管市场价格以稳为主，成交较为清淡。周内，本地天钢产热轧管坯Φ50-75价格小幅走 低，目前报3800元。考虑到市场交投氛围并不活跃，盲目下调报价只会让需求流失的更多，因此本地方管市场以稳为主。据了解，目前市场仍然处于一个进退 两难的境地，一方面，一月中旬过后下游需求将大幅回落，贸易商将面临出货较难的情… 天津方管也将随时保持坚挺走势成交方面有所…方管本周天津方管市场价格波动运行，成交冷清。周内，随着成本端市场方坯、带钢价格小幅震荡调整，同时 考虑到市场整体活跃度不高等因素，本地主流管厂方管价格也窄幅波动运行。市场方面，经销商补货操作依旧谨慎，管厂成交情况有所转淡。据了解，周内本地主流 管厂价格调价情绪不高：一方面考虑到节前方管厂家补货操作有限，现阶…