2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、GBTGBTGBTGBT94392010943920109439201094392010灰鑄鐵件灰鑄鐵件1.1.1.1.ScopeScopeScopeScopeThisstardspecifiesthetermsdefinitiondesignationtechnologyrequirementssamplingrequirementstestsmethodinspectionrulesofgreycastironthecastingi

2、dentificationpackagingstagetransptationrequirements.2.2.2.2.NmativeNmativeNmativeNmativereferencesreferencesreferencesreferences3.3.3.3.TermsTermsTermsTermsdefinitionsdefinitionsdefinitionsdefinitionsGBT5611determinethet

3、ermsthefollowingtermsdefinitionsareapplicabletothestardRelevantRelevantRelevantRelevantwallwallwallwallthicknessthicknessthicknessthicknessRelevantwallthicknessispointtocastingfracturesurfacethicknessofusedtodecidethemec

4、hanicalpropertieshavetobeagreedbetweenthemanufacturerthepurchaser.4.4.4.4.GreyGreyGreyGreycastcastcastcastironironironirondesignationdesignationdesignationdesignationThematerialdesignationrepresentationofthestardshallbei

5、naccdancewiththerequirementsofGBT5612.Thestardaccdingtothemeasuredinminimumtensilestrengthvalueofmachinedfromseparatelycasttestbardiameterof30mmstardtensilesamplesgreycastironwilltobedividedintoHT100HT150HT200HT225HT250H

6、T275HT300HT350eightgradesseetable1.Table1thedesignationmechanicalpropertyofgreycastironDesignationCastingwallthicknessminimumtensilestrengthmR(Matyvalue)(min)TensilestrengthanticipatedvaluesincastingmR(min)MPaseparatelyc

7、astTestSampleMPaAttachedcasttestsampletestpiecesMPa﹥≤HT100540100HT15051015015510201302040120110408011095801501008015030090HT200510200205102018020401701554080150130801501401151503001306.6.6.6.TheTheTheThemethodmethodmetho

8、dmethodofofofofproducingproducingproducingproducingchemicalchemicalchemicalchemicalcompositioncompositioncompositioncomposition6.1ThemethodofproducingThemouldingsthermalconductivitymouldingtherelativesproducegraycastiron

9、pieces.Themethodofproducinggreycastironshallbelefttothediscretionofthesupplierifpurchaserhasanyspecialrequirements(othermouldingwayheattreatmentsoon)whichhavetobeagreedbetweenthemanufacturerthepurchaser.6.2Chemicalcompos

10、itionWhenifthetechnologyrequirementsofpurchaserincludetheacceptancerequirementofchemicalcompositionaccdingtotheprovisionofsuppliercarryout.Whenpurchaserhasnorequirementsaboutchemicalcompositionthechemicalcompositiondecid

11、edbysupplierthechemicalcompositionisnotasthebasisofacceptanceofcasting.Buttheofchemicalcompositionmustbeensuredcastingmaterialmeetingtherequirementofmechanicalpropertymetallographicstructureinprovisionofthestard.7.7.7.7.

12、TechnologyTechnologyTechnologyTechnologyrequirementrequirementrequirementrequirement7.17.17.17.1MechanicalMechanicalMechanicalMechanicalpropertiespropertiespropertiespropertieswhetherthemechanicalpropertiesmeasuredonsepa

13、ratelycastsamplesonthecastingwhethertensilestrengthBrinellhardnessastheacceptanceindexesallmustbespecifyinanunambiguousmannerinthederthetechnologyrequirementofsupplier.Themechanicalpropertiesacceptanceindexesofcastingsha

14、llexplicitlystipulatedinder.ThemechanicalpropertiesphysicalpropertiesofgreycastirontestsamplesseeappendixappendixappendixappendixAAAAThestardspecifiedmechanicalpropertiesindexesmetallographicstructureismainindexesoftheca

15、stingacceptance.7.1.17.1.17.1.17.1.1TensileTensileTensileTensilestrengthstrengthstrengthstrength7.1.1.17.1.1.17.1.1.17.1.1.1TheTheTheThetensiletensiletensiletensilestrengthstrengthstrengthstrengthofofofofseparatelysepara

16、telyseparatelyseparatelycastcastcastcastsamplessamplessamplessamplesThestardaccdingtothemeasuredinminimumtensilestrengthvalueofmachinedfromseparatelycasttestbardiameterof30mmstardtensilesamplesgreycastironwilltobedivided

17、intoeightgradestheminimumtensilestrengthofeachgradeshallbeinaccdancewiththerequirementsofTable1.7.1.1.27.1.1.27.1.1.27.1.1.2TheTheTheThetensiletensiletensiletensilestrengthstrengthstrengthstrengthofofofofattachedattached

18、attachedattachedcastcastcastcasttesttesttesttestsamplesamplesamplesample(test(test(test(testpieces)pieces)pieces)pieces)Thetensilestrengthofattachedcasttestsample(testpieces)shallmeettheprovisionoftable1.7.1.1.37.1.1.37.

19、1.1.37.1.1.3TheTheTheThetensiletensiletensiletensilestrengthstrengthstrengthstrengthofofofofcastingcastingcastingcastingitselfitselfitselfitselfTable1giveseachdifferentgradesofwallthicknessofgreycastironitselftensilestre

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