... 100),high-and-low-pressure pipes have materialsQ23520#16MnST5237Mn5, siphon, adjustable tube, precision steel tubes card 3-5 meters highpressure rubber hoses ... -audio heat treatment equipment,all selects 45Mn2 high Mn alloy tube, after heat treatment, Rockwell hardness is up to 58 ... produce 20 #, 35 #, J55 wear-resistant materials concrete pump adjustable tube, can produce from 1 m to 3 meters of the ...