Pit & Quarry, September 2012

Wear factor identification 7 Identify the type of wear to which the part is subjected Individually or in combination the type of wear will determine the best hardfacing alloy choice to minimize wear and extend part life There are several wear categories Abrasion gouging high impact is caused by high stress grinding or lowstress scratching Adhesive wear usually metal to metal occurs from scuffing scoring galling and seizing frictional wear Cavitation erosion is a metal loss caused by the implosion of vapor cavities All nickel based hardfacing alloys should be applied with a neutral flame that is a flame that is neither oxidizing nor reducing at the metal part surface This occurs in liquid handling systems pumps impellers propellers and hydro turbine runners Fretting corrosion is encountered when closely fitted metal parts are subjected to vibration loading and stress Corrosion both galvanic and chemical High temperature High compression loads Alloy selection 8 Determine whether restoration of a dimension is needed prior to hardfacing If it is select a buildup material compatible with both the base metal and the final overlay 9 Choose your alloy wisely The alloy content of the hardfacing material determines hardness and abrasion resistance 10 Hardness of the hardfacing bead is not the major factor providing wear resistance The percentage of carbide and the type of carbide structure in the matrix determines how well a hardfacing overlay will resist wear 11 Hardfacing alloys may contain one or more of the following carbide types in the matrix iron chromium molybdenum tungsten columbium niobium vanadium and titanium When a hardfacing product forms more than one type of carbide it is referred to as a complex carbide PIT STOP 12 Consider temperature conditions A reduction in deposit hardness and wear resistance may occur if a hardfacing is subjected to a maximum service temperature that exceeds its recommended usage 13 High carbon high chromium alloys have very good abrasion resistance NEED SAND From Tough Abrasive Rock P DSVTIJOH KPC JT NPSF EJó DVMU UIBO QSPEVDJOH NBO NBEF TBOE The REMco SandMax is up to the challenge of producing quality sand that is in specifi cation with high durability cubical particle shape and the desired F M fi neness modulus that your customers demand REMco s state of the art test crushing lab off ers prospective customers an opportunity to see how a given confi guration of REMco VSI will perform with their stone Once the test crushing is complete REMco will custom confi gure a crusher to suit the specifi c needs of your material and provide you with the best all around crushing performance for fi nished product tonnage power usage and wear parts cost REMco SandMax crushers produce high sand volume for literally pennies per ton x Produce sand from abrasive gravel at UPOT QFS IPVS x Produce sand from hard Granite at UPOT QFS IPVS GPS x Produce sand from silica quartz at UPOT QFS IPVS GPS PORTABLE CHASSIS MOUNT REMco doesnt just talk a good game we back it up with our written guarantees for performance and wear cost Still unsure ask us about our Try Buy Program MODULAR SKID MOUNT Contact REMco to see what we can do you Rock Engineered Machinery Co Inc 4 7BTDP 3PBE t JWFSNPSF t 64 5FM t BY NBJM DSVTI SFNDPWTJ DPN t 8FCTJUF XXX SFNDPWTJ DPN GPS MFTT UIBO QFS ö OJTIFE UPO MFTT UIBO QFS ö OJTIFE UPO MFTT UIBO QFS ö OJTIFE UPO www pitandquarry com September 2012 PIT QUARRY 93