... C (LU class)Matenal class:AA,BB,CC,DD,EE,FF,HHSpecification class:PSL 1~4Performance class:PR1~2 Casing ... C (LU class)Matenal class:AA,BB,CC,DD,EE,FF,HHSpecification class:PSL 1~4Performance class:PR1~2 Casing ... C (LU class)Matenal class:AA,BB,CC,DD,EE,FF,HHSpecification class:PSL 1~4Performance class:PR1~2 ... C (LU class)Matenal class:AA,BB,CC,DD,EE,FF,HHSpecification class:PSL 1 4Performance class:PR1 2 ...