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厂家防止脚手架坯分层的三点措施

发布时间:2019-04-28人气:14
短期香港本地脚手架价格持续趋弱厂家多低价…脚手架香港脚手架价格持续走弱,市场方面,今本地市价主流下行,早盘期螺跳水运行,对节后归来的脚手架市场信心形成一定打击,脚手架厂家操作多低价出货为主。据本地脚手架厂家反馈,降后市场交投表现平平,下游买涨不买跌心态明显。目前部分贸易商表示南北倒挂现象难改,不愿意再进一步扩大亏损,因此采取卖空单不…

有时脚手架坯会出现分层问题,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:优化脚手架板坯的缓冷工艺,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 脚手架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。必要时对脚手架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.

预计明日南京市场脚手架价格或持续上涨成交…脚手架南京市场脚手架价格上涨,成交尚可。早盘螺纹钢期货延续夜盘强势上涨。唐山方坯累涨20元,现普碳方坯含税出厂3580元。期螺的大 涨也拉动了现货,南京市场价格多次跟涨,成交也相对顺畅。整体来看,需求对价格依然有很好的支撑,但是高价资源成交仍然较弱。不过由于期螺和钢坯的上涨, 钢厂涨价意愿强烈。综上所述,预计明日南… 国内脚手架价格或将稳中向上调整厂家多小幅…脚手架脚手架价格小幅反弹,今日唐山小窄带价格开盘较昨持稳,周末期间,小窄带出货不畅,因此盘中价格下调20,但钢坯市场反应较好,钢坯累涨20, 加之期货走强,小窄带今日出货顺畅,厂家盘中追涨10,部分厂家售罄日产;唐山355脚手架主流较昨涨10,中宽带较昨降20,今日期货市场大幅走高,尤其 是铁矿石涨停,期货市场极大地提振…
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