Cov phaj hlau nrog cov qauv ntawm qhov chaw hu ua cov phaj qauv, cov lus Askiv lub npe yog pob zeb diamond phaj.Cov qauv yog sib xyaw ua ke ntawm lentil, rhombus, puag ncig taum, thiab oblate.Cov duab lentil yog feem ntau hauv khw.Cov chaw tsim khoom: Laiwu Steel, Rizhao, Benxi Hlau thiab Hlau, Shougang, Ninggang, Meishan Hlau thiab Hlau, Anshan Hlau thiab Hlau, Taiyuan Hlau thiab Hlau, Beitai, thiab lwm yam.