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What are some of the non negligible defects that streak plates sometimes have?

  This large crossed plate castings will be casting defects, as long as it is in the national technical standards we can accept, crossed plate defects in the "detailed provisions of the People's Republic of China machinery industry standard" in the treatment of JB/T7974 - 2000.

  The streak plate working surface defect is an important part can not be ignored, including major defects: air hole, sand hole, sand, such as shrinkage, as long as the correct method can process up, crossed plate life and defects are closely related to repair, so do the repair defects of scribing plate must be strictly according to the requirement of process handling.