我厂是以生产重型汽车为主的企业,多年年,不断采用新的生产技术,利用稀土镁球铁代替部分铸钢生产出大量汽车铸件,取得了良好效果。根据国家标准规定,铸件机械性能以试块的抗拉强度和延伸率为验收依据。因此,我们一直采用楔形试块、湿型、与铸件同包浇注然后加工成试棒再进行试验的方法取得数据。为了使试块具有代表性并与铸件相互对应,在试块造 I plant is the production of heavy vehicles based enterprises, many years, continue to adopt new production technology, the use of rare earth magnesium iron instead of part of the cast steel to produce a large number of car castings, and achieved good results. According to national standards, mechanical properties of castings to test the tensile strength and elongation for the acceptance basis. Therefore, we have been using wedge-shaped test blocks, wet type, cast with castings and then processed into test rods and then test the method to obtain data. In order to make the test block representative and casting each other, made in the test block