| Designation |
Symbol |
Description |
| 交貨狀態 |
代號 |
說明（míng） |
| 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） |
最後冷加（jiā）工之後不進（jìn）行熱處理， 從而管子隻（zhī）可能進行很小（xiǎo）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） |
最後熱（rè）處理之後進行小（xiǎo）變形量的冷（lěng）加工， 對鋼管（guǎn）再加工時允許有限的冷變（biàn）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. |
| 冷加工後消除應力退火 |
最後冷加工後在（zài）Acl點（diǎn）以下（xià）進行退火， 以消（xiāo）除（chú）冷加工應（yīng）力（lì）。 |
| Annealed |
utf-8（+A） |
The last Cold forming process is followed by annealing in a controlled atmosphere. |
| 退火 |
最後冷加工之後，鋼管（guǎn）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 |
最後冷加工之後，鋼管在保護氣體下進行（háng）正火（huǒ）。 |
