AP 酸洗鈍化
管道內表面經過酸洗鈍化、清洗，不會提高表面粗糙度，但可去除表面殘存的顆粒和
油脂，降低能量水平，但不會減少介層數量。Ra≤1.0mm
The inside surface roughness of pipe after Acid picklingpassivation will not be improved, but the surface of the particles and oil canbe removed, and the energy level can be reduced, but the number of layers willnot reduce. Ra≤1.0mm
BA 光亮退火
在加氫或真空狀態高溫處理，一方面消除內部應力，另一方面在管道表面形成一層鈍
化膜，以改善形態結構，減少能量水平，在一定程度上改善了表面粗糙度。Ra≤0.8mm
In the process of high temperature treatment, the internalstress is eliminated on the one hand,
and on the other hand, the formation of a passivation film is formed on thepipe surface to improve the structure and reduce the energy level. And theinside surface roughness of pipe is improved in a certain way. Ra≤0.8mm
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