<font id="plvb9"><thead id="plvb9"><form id="plvb9"></form></thead></font>

    <em id="plvb9"></em>
    <address id="plvb9"></address>
      <noframes id="plvb9">

      <em id="plvb9"></em>



          當前位置 -> 方管知識- 廠家防止方管坯分層的三點措施 發布時間:(2019/1/29)


        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.
        (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。控制冷卻優化后,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.
        (3) Centralized charging system
        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.

        相關閱讀:埋弧焊螺旋方管VS直縫高頻焊方管的區別 | 廠家預計明日國內焊管實質交投暗降靠低 | 1月28日無錫市場焊管價格行情預期仍偏悲觀
        本站網址:http://www.rzxingli.com 來源:鑫盛源方管  瀏覽次數:1170 
        網站導航 | 方管廠家介紹 | 方矩管展示 | 方管知識 | 方管規格 | 銷售網絡 | 價格行情 | 客戶留言 | 方管銷售電話 | 博客
        地圖 Sitemap 方管
        美国成年性色生活片 - 视频 - 在线观看 - 影视资讯 -大块网