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Designation
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Symbol
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Description |
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交貨狀態
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代號
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說明 |
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Cold finished (hard)
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BK（+C）
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Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation
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冷加工(硬)
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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.
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Cold finished (Soft)
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BKW
（+LC）
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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)
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冷加工(軟)
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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)
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Cold finished and stress-relieved
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BKS（+SR）
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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.
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冷加工后消除應力退火
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最后冷加工后在Acl點以下進行退火, 以消除冷加工應力.
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Annealed
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GBK（+A）
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The last Cold forming process is followed by annealing in a controlled atmosphere.
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退火
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最后冷加工之后,鋼管在保護氣體下進行完全退火.
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Normalized
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NBK（+N）
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The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.
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正火
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最后冷加工之后,鋼管在保護氣體下進行正火.
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