... .hardness of 62-64 4.long service life PM DN175 wear resisting flange MaterialQ235,20#steelModelDN125,DN150,DN175,so onTechnicalForging, high ... the new generation of concrete pump truck pipe flanges and wear-resisting, forgings with high-tech heat treatment technology, hardness of ... 62-64 °. 3.This series of products for high wear-resisting hardening of the product, the product is high abrasion ...