上海方管市场价格或震荡偏弱成交表现不如人…方管本周上海方管市场价格震荡下行。现货方面，近日市场较为乏力，方管厂家信心不足，开另外现在外围市场价格也是跌跌不 休，整个钢市情绪不佳，成交上表现不如人意。主要是价格的连番下调之下，终端商户观望居多。总之在当前钢市环境下，钢企均谨慎，随着社会库存的累积，市场 看空心态加剧，认为价格还要再下跌…

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.

北京镀锌方管价格小幅下跌厂家冬储意向并不…方管本周北京镀锌方管价格小幅下跌，截至12月27日，其中焊管4寸（3.75mm） 价格为4160元；镀锌管4寸（3.75mm）利达产5100元，正金元产4860元，唐山京华产4790元，吉立（正大）产4810元，君诚产4830 元，天谊产4780元；均比上周同期下跌40。截至12月27日，唐山热轧带钢(2.5*355mm)瑞丰3650比上周下调40元。本周带钢资源相对稳定，… 方管市场价格稳中有涨市场成交有所放量方管方管市场价格稳中有涨。主导市场，北京小幅下跌，天津、上海小幅拉涨，广州以稳为主。昨日在期货的带动下，方管现货市场成交有所放量，市场心态普遍好转。虽然昨日夜盘再度走低，但这并未影响到市场想要拉涨的情绪，所以今日开市，市场价格稳中有涨。不过从市场了解到，今日拉涨后，方管市场表现相 当差劲，高位资源成交遇阻…