C70W2,UC70KU,钢板性能 HC220B HC220I HC220P HC220Y HC260B HC260I HC260LA HC260Y HC300B HC300I HC300LA HC300P HC340LA HC380LA HC420LA 锅炉和压力容器用钢板;16MND5 14MNDV5 18MND5 12CD9.10 12CD12.10 12CD9.10 16MND5 18M