Transcription of Fatigue-Proof - Niagara Lasalle Corporation
1 Fatigue-Proof SpecificationsChemistry* ,000psi(Min) ,000psi(Min)80%of12125%(Min)inquantities normallyassociatedwithsteeltensile through3-1/2 as-drawn finishissmooth,accurate, through1-1/2 , ** ,thismaterial willglazeandworkhardenifthetoolisnotcutt ing. Anyfortified cuttingoilworks,although,when threadingandtappingisinvolved, , pleasecallandrequestacopyofNiagaraLaSall e sLargestIndependentColdFinishedSteelBarP roducer1412 150thStHammond,IN46324(877)BUY-BARSFax:( 219) Fatigue-Proof has the highstrength properties usually associatedonly with heattreatedsteels. It also hasexcellent machining characteristics, resistancetofatigueand correspondsto qualityhot rollgrade Fatigue-Proof is madebyvarious combinationsofmechanical workingandthermaltreatmentwear,and is produced froma highmanganese, resulfurized, silicon killedsteel.
2 Thechemical specificationfor Fatigue-Proof Fatigue-Proof is definitelya has hightensile strengthandhardness properties usually associatedonly with heattreatedsteels,it is anexcellent machiningmaterial. Forexample, Fatigue-Proof isratedat 80% of1212 andwillmachine about25%fasterthanannealed alloy steelsand 50%to100% fasterthanheattreatedsteels. With thisfuturisticbarsteel faster speeds, heavier feedsandbettertool life arepossible comparedwithmaterialsheattreatedto thesame s finemachining characteristics often havea positive effectonmachining costs, product quality, turns,forms, broaches,drills,reams, splines, finishis is one of the most common causes of mechanical failures for metals in service. Since these failures normally originate at points of high stress concentration, perhapsalarge percentage ,it is notpossibletodesign useful partsand at thesametimeeliminateall pointsofstressconcentrationsuch asnotches, holes, threads, changeofsectionand tool marks.
3 Itshouldbenotedthat thefatiguelife of a part ismore complexthan that of 150 parts, sincetheyrarely requirefinalstraightening, normallydo nothavetheunfavorable residualstressesresultingfrom and 150 machine cleanandsmoothtominimize deeptoolmarksandtearsinfilletsandspliner oots. Also, Fatigue-Proof 150 'suniform properties acrossthe barmeanthat their strengthis maintained even when severestepdownsin thefinishedpart Niagara Lasalle s (elevated temperature drawn)process. This is a highstrength steelbar thateliminatesheattreatingandsecondaryop erationssuch ascleaning, straightening, secondary machiningand inspections. Allthis,incombinationwith freemachiningand highstrength, operatestolowerend can also be induction hardened but should be watched for quench cracks, and, being a resulfurized steel, a magnetic particle inspection opertation should be performed after heat treating.
4 Fatigue-Proof is also electro-magnetically tested using eddy currentsandpre-testedformachinability through Niagara Lasalle s *AISI 1144 heatsto be used forFatigue- proof areusually nitrogen treatedandcontainnitrogen *In theeventofdisagreement between hardnessandtensile strength,theRockwellC Area15% (M in)*30(Min)*285 (Min)RoundsHexagons1/4 to less than7/16 1/4 to less than 3/8 7/16 to1-1/2 3/8 to less than 7/16 Over1-1/2 to3-1/2 7/16" to 1-1/2"
