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    1. BK-BKW-BKS-GBK-NBK的意義

      發布時間:2011.11.10 新聞來源:直縫鋼管_大口徑直縫鋼管_厚壁鋼管_高頻焊接鋼管-河北美德鋼管制造有限公司 瀏覽次數:

      網上經常有人問,BK,BKW,BKS,GBK,NBK 是什么意思,我想看了這個大家應該明白了。

      Designation

      Symbol

      Description

      交貨狀態

      代號

      說明

      Cold finished (hard)

      BK(+C)

      Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation

      冷加工(硬)

      最后冷加工之后不進行熱處理, 從而管子只可能進行很小的變形.

      Cold finished (Soft)

      BKW
      (+LC)

      The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding)

      冷加工(軟)

      最后熱處理之后進行小變形量的冷加工, 對鋼管再加工時允許有限的冷變形(例如: 彎曲, 擴口)

      Cold finished and stress-relieved

      BKS(+SR)

      Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree.

      冷加工后消除應力退火

      最后冷加工后在Acl點以下進行退火, 以消除冷加工應力.

      Annealed

      GBK(+A)

      The last Cold forming process is followed by annealing in a controlled atmosphere.

      退火

      最后冷加工之后,鋼管在保護氣體下進行完全退火.

      Normalized

      NBK(+N)

      The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.

      正火

      最后冷加工之后,鋼管在保護氣體下進行正火.

       

       

       

       

       

       

       

       

       

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