Abstract：The main metallurgical factors leading to wheel rim crack included the presence of angular Al2O3 inclusions， large inclusions accumulated on the surface of runner bricks and the products of cast refractory material melting damage. The harm of Al2O3 inclusions could be reduced by using"spherical MnS encapsulating point oxide" technology. After using high alumina brick and the "constantflux" casting technology，the amount of large inclusions and melting loss products of refractory materials were decreased，and the pass percent of ≤ . 2 mm" ultrasonic testing of the mold casting steel wheel rim was enhanced from 92%to 99%. After adopting continuous casting process，the pass percent of less than . 1mm" ultrasonic testing of wheel rim was reached to 99.7%.
2019, Vol. 37 
