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                  廠家防止方管坯分層的三點措施

                  發布時間:2019-04-28人氣:62
                    長沙鍍鋅方管價格或將偏強運行廠家成交較好今日期螺高位震蕩,尾盤收漲32元/噸?,F貨方面,長沙鍍鋅方管市場價格明顯上漲。成交方面,連日來長沙鍍鋅方管到貨量少,多數方管廠家反映庫存水平較低,規格不齊,成交也隨之走弱;另一方面,由于市場上部分品種…

                  有時方管坯會出現分層問題,從而導致探傷不合。要預防這一缺陷,我們可以采取以下三點處理措施:(一)優化緩冷時間:優化方管板坯的緩冷工藝,主要針對堆垛溫度和堆垛持續時間。軋制鋼板厚度不大于80mm鋼板熱矯直后,在冷床停留時間不得超過5min。厚度大于80mm鋼板可適當延長至10min,確保鋼板成垛前溫度控制在500℃以上。鋼板厚度不大于50mm鋼板緩冷時間在12h;厚度大于50mm的鋼板緩冷時間24h,嚴禁提前拆垛精整。
                  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)優化控制冷卻
                  (2) Optimizing Controlled Cooling 方管板坯出現貝氏體一般是由于冷速過快造成的。當冷卻速度降低至3-5℃/s時,鋼板心部偏析帶不再出現貝氏體組織,形成常規的珠光體組織??刂评鋮s優化后,板坯心部偏析帶組織應力明顯減少,因組織應力產生的微裂紋得到大大改善。
                  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)集中裝爐制度
                  (3) Centralized charging system
                  在實際生產中軋制鋼板的長及寬相差較大,在鋼板緩冷時存在堆垛不整齊的情況,導致超寬板邊部探傷檢驗不合格或是超長板頭部探傷檢驗不合格。通過建立集中裝爐制度,安排軋制鋼板長、寬相近的合同集中裝爐,保證后續鋼板堆垛的整齊。必要時對方管板坯周邊采用石棉布包裹,加強保溫效果。
                  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.

                    國內方管市場繼續穩中向上運行廠家出貨較昨日轉…方管市場價格延續漲勢。今日開市,市場停限產消息依舊不斷,期貨也因此繼續高位飄紅運行,現貨市場上漲意愿依舊較強,今日華北市場邯鄲、唐山、天津漲20-30元,華東 市場上海、江陰部分漲10元左右,華南市場基本維穩,…
                  辛苦整理!轉載請注明來自 http://www.ganzhouwan.com/news/xw2/69.html

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