... ,and wearing resistance !We add the Manganese Elements in the Steel ,It is of high hardness ... and have a long using time !For the Jaw ... industry , cement ,petroleum etc. 3)Material: high manganese steel : Mn13% , Mn18%, Mn24% High chromium iron : ... Cr20 , Cr24 up Carbon Steel HT200QT400-154) Production quality testing equipment : LOBF direct ...