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                                                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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