A pressure forming steel method, combination and thread, an internal drill consisting of concrete coating, directly touches the inner surface of the metal shell around the coated metal shell, and in this shell. Compression is carried out through a metal housing.

摘要

A Cao Coated Steel Casting, concrete Coating comprises an annular or Montero, a Metal Casing that surrounds the coatingWhere the coating is in direct contact with a surface of inner Wall of the Metal Shell; Manufacturing method; whole Moulding pressure.