天津方管市场整体偏弱整体库存依旧未见减少…方管天津方管市场价格稳中盘整，成交情况较上周有所好转。周初，由于上周末市场整体活跃程度不高，加之原料市场小幅震荡，本 地主流管厂方管价格开始转入平稳盘整状态。周中至周后期，成本端价格继续窄幅震荡，对于方管的支撑作用有所减弱，本地方管市场价格也随之小幅调整。从市场 了解到，随着建筑工程项目陆续…

有时方管坯会出现分层问题，从而导致探伤不合。要预防这一缺陷，我们可以采取以下三点处理措施：(一)优化缓冷时间：优化方管板坯的缓冷工艺，主要针对堆垛温度和堆垛持续时间。轧制钢板厚度不大于80mm钢板热矫直后，在冷床停留时间不得超过5min。厚度大于80mm钢板可适当延长至10min，确保钢板成垛前温度控制在500℃以上。钢板厚度不大于50mm钢板缓冷时间在12h;厚度大于50mm的钢板缓冷时间24h，严禁提前拆垛精整。
Sometimes the stratification of square billet will occur, which will lead to incompatibility of flaw detection. To prevent this defect, we can take the following three measures: (1) Optimizing slow cooling time: optimizing slow cooling process of tube slab, mainly for stacking temperature and stacking duration. After hot straightening, the residence time in the cold bed should not exceed 5 minutes for the rolled steel plate whose thickness is not more than 80 mm. Thickness of steel plate over 80 mm can be appropriately extended to 10 minutes to ensure that the temperature of steel plate before stacking is controlled above 500 C. The slow cooling time of steel plate with thickness less than 50 mm is 12 hours; the slow cooling time of steel plate with thickness greater than 50 mm is 24 hours. It is strictly forbidden to disassemble and stack in advance.
(二)优化控制冷却
(2) Optimizing Controlled Cooling 方管板坯出现贝氏体一般是由于冷速过快造成的。当冷却速度降低至3-5℃/s时，钢板心部偏析带不再出现贝氏体组织，形成常规的珠光体组织。控制冷却优化后，板坯心部偏析带组织应力明显减少，因组织应力产生的微裂纹得到大大改善。
Bainite in square tube slab is usually caused by too fast cooling rate. When the cooling rate is reduced to 3-5 C/s, the bainite structure is no longer present in the segregation zone of the steel plate core, and the conventional pearlite structure is formed. After controlled cooling optimization, the microstructural stress of segregation zone in the center of slab decreases obviously, and the microcracks caused by microstructural stress are greatly improved.
(三)集中装炉制度
(3) Centralized charging system
在实际生产中轧制钢板的长及宽相差较大，在钢板缓冷时存在堆垛不整齐的情况，导致超宽板边部探伤检验不合格或是超长板头部探伤检验不合格。通过建立集中装炉制度，安排轧制钢板长、宽相近的合同集中装炉，保证后续钢板堆垛的整齐。必要时对方管板坯周边采用石棉布包裹，加强保温效果。
In actual production, the length and width of rolled steel plate are quite different. When the steel plate is slowly cooled, there is irregular stacking, which results in unqualified edge inspection or head inspection of ultra-wide plate. By establishing the centralized charging system, arranging the contract centralized charging of rolling steel plate with similar length and width to ensure the orderliness of subsequent stacking of steel plate. When necessary, asbestos cloth is used to wrap around the square tube slab to enhance the insulation effect.

镀锌方管在行业中有哪些用途呢？方管镀锌方管在行业中有哪些用途呢？下边方管厂家就为你介绍一下吧。镀锌方管是什么,相信有很多人还不是非常的了解,这实际上就是一种利用冷轧或者是热轧方式加工制作而成的管道.在进行管道生产的时候,工作人员首先需要对于管道进行冷弯加工然后再进行高频焊接将其制作成方形管道.但是如果想要指制作成耐腐蚀性更好的镀锌方管的话… 沧州方管市价震荡偏弱依然趋弱厂家多暗降出…方管本周自周一黑色系期螺突然跳水后，整体走势趋弱几次跳水。主要是上周的上涨，现货的成交明显跟不上期货的节奏支撑不够。消息面，脱欧还在半空中， 梅姨辞职；铁矿石、焦炭疯长，中美贸易战不断加剧。管坯近日再次走弱，临沂管厂也出现小幅下调。市场方面，近三个月沧州方管成交量处于递减状态，本地方管市场交投氛围清淡，方…