设为首页 | 收藏本站 | 热点标签
世界买家网 微信:QQ:1407106692
欢迎您访问世界买家网 微信:QQ:1407106692 ,本站各频道将陆续上线,敬请您的关注。
> RSS订阅贸易知识堂 > 行业知识 > 冶金行业 > Metal Terminology (G-H)金属术语G-H

Metal Terminology (G-H)金属术语G-H

作者:世界买家网 微信:QQ:1407106692 来源:todaytex.com 发布时间:12-8 11:16:50

MetalTerminology(G)金属术语G

GAGES
(Metal)-Mfrs.standardnumberingsystemsindicatingdecimalthicknessordiameters.


GALLING
Thedamagingofoneorbothmetallicsurfacesbyremovalofparticlesfromlocalizedareasduetoseizurecuringslidingfriction.


GALVANIZING
Coatingsteelwithzincandtin(principallyzinc)forrustproofingpurposes.Formerlyforthepurposeofgalvanizing,cutlengthsteelsheetswerepassedsinglythroughabathofthemoltenmetal.Today’sgalvanizingprocessingmethodconsistsofuncoilingandpassingthecontinuouslengthofsuccessivecoilseitherthroughamoltenbathofthemetaltermedHotDippedGalvanizingorbycontinuouslyzinccoatingtheuncoiledsheetelectrolytically-termedElectro-Galvanizing.


GAMMAIRON
Theformofironstablebetween1670癋.,andcharacterizedbyaface-centeredcubiccrystalstructure.


GILDINGMETAL
Acopper-zincalloycontaining95%copperand5%zinc.Whilesimilartodeoxidizedcopperinphysicalproperties,itissomewhatstrongerandveryductile.Ithasthermalandelectricalconductivityslightlybetterthanhalfthatofelectrolyticcopperandcorrosionresistancecomparabletocopper.


GRAIN
Asolidpolyhedral(ormanysidedcrystal)consistingofgroupsofatomsboundtogetherinaregulargeometricpattern.Inmillpracticegrainsareusuallystudiedonlyastheyappearinoneplane.(1)Directionof:Referstograinfiberfollowingthedirectionofrollingandparalleltoedgesofstriporsheets.(2)Tobendacrossthegrainistobendatrightanglestothedirectionofrolling.(3)Tobendwiththegrainistobendparalleltothedirectionofrolling.Insteel,theductilityinthedirectionofrollingisalmosttwicethatatrightanglestothedirectionofrolling.


GRAINBOUNDARY
Boundingsurfacebetweencrystals.Whenalloysyieldnewphases(asincooling),grainboundariesarethepreferredlocationfortheappearanceofthenewphase.Certaindeteriorations,suchasseasoncrackingandcausticembrittlement,occuralmostexclusivelyatgrainboundaries.


GRAINGROWTH
Anincreaseinmetalliccrystalsizeasannealingtemperatureisraised;growthoccursbyinvasionofcrystalareasbyothercrystals.


GRAINS
Individualcrystalsinmetals.


GRAINSIZE
Averagediameterofgrainsinthemetalunderconsideration,oralternatively,thenumberofgrainsperunitarea.Sinceincreaseingrainsizeisparalleledbylowerductilityandimpactresistance,thequestionofgeneralgrainsizeisofgreatsignificance.Theadditionofcertainmetalsaffectsgrainsize,forexamplevanadiumandaluminumtendtogivesteelafinegrain.TheASTMhassetupagrainsizestandardforsteels,andtheMcQuaid-EhnTesthasbeendevelopedasamethodofmeasurement.


GRANULATED
Acoarsegrainorpebblysurfaceconditionwhichbecomesevidentduringdrawing.(SeeOrangePeel)


GRANULATION
Theformationofgrainsimmediatelyuponsolidification.


GRAPHITIZING
Aheatingandcoolingprocessbywhichthecombinedcarbonincastironorsteelistransformed,whollyorpartly,tographiticorfreecarbon.


GROUNDFLATSTOCK
Annealedandpreground(toclosetolerances)toolsteelflatsinstandardsizesreadyfortoolroomuse.Thesearethreecommongrades;waterhardening,oilhardeningandairhardeningquality.


GUIDE
Deviceforholdingthemetalintheproperposition,duringrolling,orslitting.


GUIDESCRATCH
(Defect)-Scratchesormarksappearingparalleltoedgesofcoldrolledstripcausedbyscaleorotherarticleswhichhavebecomeimbeddedinorhaveadheredtotherollingmillguide.Alsoappliestosimilarscratchesappearingasaresultofslitting.


MetalTerminology(H)金属术语H


HALFHARDTEMPER
(A)No.2Temper.Inlowcarboncold-rolledstripsteel,producedbycoldrollingtoahardnessnexttobutsomewhatsofterthanfullhardtemper.(B)InbrassStainlessSteelStrip,tempersarebasedonminimumtensileoryieldstrength.ForChromium-NickelgradesHalf-HardTemper150,000TS.,110,000YS.Min.


HARDDRAWING
Drawingmetalwirethroughadietoreducecrosssectionandincreasetensilestrength.


HARDDRAWN
Wireortubingdrawntohightensilestrengthbyahighdegreeofcoldwork.


HARDDRAWNSPRINGSTEELWIRE
Amediumhighcarboncolddrawnspringsteelwire.Usedprincipallyforcoldsprings.


HARDENABILITY
Theabilityofametal,usuallysteel,tohardenindepthasdistinguishedfromtheterms“hardness.”


HARDENEDANDTEMPEREDSPRINGSTEELSTRIP
Amediumorhighcarbonqualitysteelstripwhichhasbeensubjectedtothesequenceofheating,quenchingandtempering.


HARDENING
Anyprocesswhichincreasesthehardnessofametal.Usuallyheatingandquenchingcertainironbasealloysfromatemperatureeitherwithinorabovethecriticaltemperaturerange.


HARDNESS
Degreetowhichametalwillresistcutting,abrasion,penetration,bendingandstretching.Theindicatedhardnessofmetalswilldiffersomewhatwiththespecificapparatusmeasuringhardness.(SeeBrinellHardness,RockwellHardness,VickersHardness,ScleroscopeHardness)TensileStrengthalsoisanindicationofhardness.


HARDTEMPER
(A)ForSteelseeFullHardTemper.(B)Inbrassmillterminology.HardTemperisfourB&Snumbershardor37.1%reduction.


HEATOFSTEEL
Theproductofasinglemeltingoperationinafurnace,startingwiththechargingofrawmaterialsandendingwiththetappingofmoltenmetalandconsequentlyidenticalinitscharacteristics.


HEATTREATMENT
Alteringthepropertiesofametalbysubjectingittoasequenceoftemperaturechanges,timeofretentionatspecifictemperatureandrateofcoolingthereforebeingasimportantasthetemperatureitself.Heattreatmentusuallymarkedlyaffectsstrength,hardness,ductility,malleability,andsimilarpropertiesofbothmetalsandtheiralloys.


HIGHBRASS
65%-Acopper-zincalloycontaining35%zinc.Possesseshightensilestrengthandisusedforsprings,screws,rivets,etc.


HOOKE’SLAW
Stressisproportionaltostrainintheelasticrange.ThevalueofthestressatwhichamaterialceasestoobeyHooke’slawisknownastheelasticlimit.


HOTDIP
Insteelmillpractice,aprocesswherebyferrousalloybasemetalsaredippedintomoltenmetal,usuallyzinc,tinorterne,forthepurposeoffixingarustresistantcoating.


HOTSHORT
Brittlenessinhotmetal.


HOTTOP
(SeeSinkhead)


HOTWORKING
Plasticdeformationofmetalatatemperaturesufficientlyhighnottocreatestrainhardening.Thelowerlimitoftemperatureforthisprocessistherecrystallizationtemperature.


HYDROGENEMBRITTLEMENT
(1)Brittlenessofmetal,resultingfromtheocclusionofhydrogen(usuallyasaby-productofpicklingorbyco-depositioninelectroplating).(2)Aconditionoflowductilityresultingfromhydrogenabsorptionandinternalpressuredevelopedsubsequently.Electrolyticcopperexhibitssimilarresultswhenexposedtoreducingatmosphereatelevatedtemperature.


HYPEREUTECTOIDSTEEL
Asteelhavingmorethantheeutectoidpercentageofcarbon.(SeeEutectoidSteel)


HYPOEUTECTOIDSTEEL
Steelwithlessthaneutectoidpercentageofcarbon.(SeeEutectoidSteel)

相关内容