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1、常用五金螺丝材料（Commonhardwarescrewmaterial）FastenermaterialMaterialrequirementsforbolts,screwsandstuds(GB/T3098.1-2000),performancegrades,materialsandheattreatment,chemicalcomposition,%temperingtemperatureCMinCPMaxSMaxB1)MaxMinmax3.62)carbonsteel-0.20,0.05,0.0
2、6,0.003-4.62)-0.55,0.05,0.06,0.003-4.82)5.6,0.13,0.55,0.05,0.06,0.003--5.82)-0.55,0.05,0.066.82)(align=center>8.83)lowcarbonalloysteels(suchasboron,manganeseorchromium),Quenchedandtemperedormediumcarbonsteel,Quenchedandtempered0.154)0.04,0.035,0.035,0.00
3、34250.25,0.55,0.035,0.0359.8lowcarbonalloysteels(suchasboron,manganeseorchromium),Quenchedandtemperedormediumcarbonsteel,Quenchedandtempered0.154)0.35,0.035,0.035,0.0034250.25,0.55,0.035,0.03510.95)(6)lowcarbonalloysteels(suchasboron,manganeseorchromium)
4、,Quenchedandtempered0.154)0.35,0.035,0.035,0.00334010.96)incarbonsteel,quenchingandtempering,orlowcarbonsteel(suchasboron,manganeseorchromium),quenchingandtemperingsteeloralloyquenchandtempering7)0.250.204)0.550.55,0.0350.035,0.0350.035,0.034250.20,0.55,
5、0.035,0.035,0.00310.96)8)9)quenchedandtempered7)0.28,0.50,0.035,0.035,0.0033801)thecontentofboroncanreach0.005%,andthenoneffectiveboroncanbecontrolledbyaddingtitaniumand/oraluminum.2)thesegradesallowforeasycutting.Themaximumcontentofsulfur,phosphorusandl
6、eadis0.34%,phosphorus0.11%,andlead0.35%.3)inordertoensuregoodhardenability,fastenerswiththreaddiametersexceeding20mmshallbemadeofsteelspecifiedingrade10.9.4)theminimummanganesecontentoflowcarbonalloysteelswithcarboncontentbelow0.25%(barrelsampleanalysis)
7、is:8.8:0.6%;9.8,10.9and10.9:0.7%.5)theproductshallbemarkedwithahorizontallineundertheperformancelevelcode.Class10.9ofgrade10.9performanceshallcomplywithallregulations,andlowtemperatureonthefirealonginmocktemperatureconditionswillcausestressweakenedindiff
8、erentdegree.6)thematerialusedforthisperformanceratingshallhaveagoodhardenabilitytoensurethatthecoreofthethreadedsectionofthefastenerobtainsabout90%ofthemartensitemicrostructureafterquenchingandtempering.7)alloysteelshouldc
