Designation
|
Symbol
|
Description |
交货状态
|
代号
|
说明 |
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)
|
最后冷加工之后不进行热处理, 从而管子只可能进行很小的变形.
|
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(软)
|
最后热处理之后进行小变形量的冷加工, 对钢管再加工时允许有限的冷变形(例如: 弯曲, 扩口)
|
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.
|
冷加工后消除应力退火
|
最后冷加工后在Acl点以下进行退火, 以消除冷加工应力.
|
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,钢管在保护气体下进行完全退火.
|
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,钢管在保护气体下进行正火.
|