... 62-64 4.long service life DN150 concrete pump pipe fittings MaterialQ235,20#steelModelDN125,DN150,DN175,so onTechnicalForging, high-temperature 1200 ... heat treatment technology, hardness of 62-64 °. 3.This series of products for high wear-resisting hardening of the product ... is high abrasion resistance and its advantage than ordinary pipe fittings of long service life. 4.Stable product quality, the ...