... flanges MaterialQ235(ASTM A36)ModelDN125,DN150,DN175,so onTechnicalForging, high-temperature 1200 forging and intoAppicationConnection of Concrete pump and ... 1.We are a manufacturer,the national high quality 20# steel (Q235), high-temperature 1200 rolling and into. 2.Company ... concrete pump truck pipe flanges and wear-resisting, forgings with high-tech heat treatment technology, hardness of 62-64 °. 3. ...