许多作特殊用途的钢铸件,一者要求精加工后,在加工面(部分加工面往往在铸壁的中心线)上不许有疏松缺陷,二者要求能经受得住X光的透视检验,即:在X光的检查下也发现不了铸件的中线疏松及内裂纹。内裂纹往往是由于中线疏松所引起的,对于此类铸件,必须具有十分致密的组织。下面就研讨一下有关获得致密钢铸件的一些方法。 Many special-purpose steel castings, one of which requires finishing, the processing of the surface (part of the processing surface often in the centerline of the casting wall) is not allowed to have loose defects, both require the ability to withstand the X-ray perspective test, that : In the X-ray examination also found casting casting loose and internal cracks. Internal cracks are often caused by loosening of the midline. For such castings, it must have a very dense structure. Below to discuss some of the ways to obtain a compact steel castings.