1.前言 我厂生产的铸钢件以前使用广东石英砂(40/70目),因原砂货源远,铁路运输困难而不能及时供货影响生产。我们改用本地石英砂,但其粒度较细(50/100目),粉尘含量较高(5.6％),砂粒的强度较低。用该砂配制的型砂生产铸钢平板件、块状件、环形件及轮形件等厚壁件,其铸件容易产生夹 1. Foreword The steel castings produced by our factory used the quartz sand (40/70 mesh) of Guangdong before, because the original sand is far away from the source, the railway transportation is difficult and can not be timely supplied to affect the production. We switched to local quartz sand, but with a finer grain size (50/100 mesh), higher dust content (5.6%) and lower grit strength. Cast sand with the sand production of steel plate, block, ring and wheel parts and other thick-walled parts, the casting is easy to produce folder