SC431240802JT轴系铸锻件订货技术条件剖析.docx
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SC431240802JT轴系铸锻件订货技术条件剖析
CONTENTS
1.
Steelforgings
1.1
General
1.2
Manufacture
1.3
Chemicalcomposition
1.4
Heattreatment
1.5
Testmaterial
1.6
Mechanicaltests
1.7
Visualandnon-destructiveexamination
1.8
Quality
1.9
Identification
1.10
Certification
1.11
Attacheddrawing
2.
Coppercasting
2.1
General
2.2
Manufacture
2.3
Chemicalcomposition
2.4
Heattreatment
2.5
Testmaterial
2.6
Mechanicaltests
2.7
Inspectionandnon-destructiveexamination
2.8
Identification
2.9
Certification
2.10
Attacheddrawing
1.Steelforgings
1.1General
1.1.1Theintermediateandpropellershaftstobemadefromhigh-qualitycarbonsteelwithtensilestrengthlevelof560N/mm2.Onepieceofeachshaftpership,andonesparepropellershafttobesuppliedpertwoshipsbyS/Y.
Thereamingboltsaretobemadefromalloysteelswithtensilestrengthlevelof880N/mm2.Twenty-fourpiecesofforgingpership.
Thepistonandbodyofhydraulicnuttobemadefromhigh-qualitycarbonsteelwithtensilestrengthlevelof600N/mm2.Onepieceofpership.
Thesterntubeseatandbearingseattobemadefromhigh-qualitycarbonsteelwithtensilestrengthlevelof400N/mm2.Onepieceofpership.
1.2Manufacture
1.2.1Forgingsaretobemadeatworks,whichhavebeenapprovedbyBV.Thesteelistobemanufacturedbytheelectricoroneofthebasicoxygenprocesses.
1.2.2Forcomponentsforgeddirectlyfromingotsorfromforgedbloomsorbilletsandinwhichthefibredeformationismainlylongitudinalthereductionratioisnottobelessthan3:
1.
1.2.3Wherethelengthofanysectionofashaftforgingislessthanitsdiameter,thereductionratioistobenotlessthanhalfthatgivenin1.2.2.
1.3Chemicalcomposition
1.3.1Allforgingsaretobemadefromkilledsteels.
1.3.2Forforgingsthechemicalcompositionofladlesamplesistocomplywiththefollowingoveralllimits:
Carbon
0.60%max（forshaftsandpiston&hyd.nut）
0.23%max（forsterntubeseat&bearingseat）
Silicon
0.45%max
Manganese
0.30-1.60%
Sulphur
0.040%max
Phosphorus
0.040%max
Residualelements:
Copper
0.30%max
Chromium
0.30%max
Molybdenum
0.15%max
Nickel
0.40%max
Total
0.80%max
Exceptwhereotherwisespecified,suitablegrainrefiningelementssuchasaluminium,niobiumorvanadiummaybeusedatthediscretionofthemanufacturer.Thecontentofsuchelementsistobereportedintheladleanalysis.
1.3.3Thereamingboltsaretobemadeofalloysteel（30CrMo）.
1.4Heattreatment
1.4.1Atanappropriatestageofmanufacture,aftercompletionofallhotworkingoperations,forgingsaretobesuitablyheattreatmenttorefinethegrainstructureandtoobtaintherequiredmechanicalproperties.
1.4.2Ifanystraighteningoperationisperformedafterthefinalheattreatment,considerationshouldbegiventoasubsequentstressrelievingheattreatmentinordertoavoidthepossibilityofharmfulresidualstresses.
1.4.3Theforgingsaretobe:
a）Fullyannealed,or
b）Normalized,or
c）Normalizedandtempered,or
d）Quenchedandtempered.
Thetemperingtemperaturetobenotlessthan550oC.
1.4.4Theboltforgingsaretobequenchedandtempered.Thetemperingtemperaturetobenotlessthan550oC.
1.5Testmaterial
15.1SpecimensformechanicaltestsaretobepreparedasrequiredbyBV.
15.2Thetestspecimensofshaftaretobetakeninthelongitudinaldirectionbutatthediscretionofthemanufacturerand,ifagreedbytheSurveyor,alternativedirectionsorpositionsrecommendedbyBVmaybeused.
15.3Testmaterial,sufficientfortherequiredtestsandforpossiblere-testpurposes,istobeprovidedwithacross-sectionalareaofnotlessthanthatpartoftheforgingwhichitrepresents.Thistestmaterialistobeintegralwitheachforging.
1.6Mechanicaltests
Themechanicalpropertiesofshaftforgingstobeconformtotherequirementsgiveninthefollowingtables:
Steelforging
Tensilestrength
Rm（N/mm2）
min.
Yieldstress
ReH
（N/mm2）min.
Elongation
A5（%）
min.
Reductionofarea
Z（%）min.
Averageimpactenergy（J）
at+20oCmin.
BrinellhardnessHB
V-notch
U-notch
L
T
L
T
L
T
L
T
Intermediate&propellershaft
560
280
20
14
40
27
25
15
25
17
160-200
Reamingbolts
880
670
13
9
40
27
27
18
26
20
255-305
Hydraulicnutbody&piston
600
300
18
13
40
27
18
12
20
15
175-215
Sterntubeseat&bearingseat
400
200
26
19
50
35
32
18
30
20
110-150
L:
LongitudinalT:
Transverse
1.6.1Wheremorethanonetensiletestistakenfromaforging,thevariationintensilestrengthisnottoexceed70N/mm2（forshafts,sterntubeseatandbearingseat）,100N/mm2（forreamingboltsandhydraulicnutbody&piston）.
1.7Visualandnon-destructiveexamination
1.7.1Beforeacceptance,allforgingsaretobepresentedtosurveyorforvisualexamination.Whereapplicable,thisistoincludetheexaminationofinternalsurfacesandbores.
1.7.2Forgingsaretobeexaminedintheconditionforfinaldelivery.Surfacesaretobecleanandfreefromdirt,grease,paint,etc.Blackforgingsaretobesuitablydescaledbyeithershotblastingorflamedescalingmethods.
1.7.3Ultrasonicexaminationistobecarriedoutaftertheforgingshavebeenmachinedtoaconditionsuitableforthistypeofexaminationandafterthefinalheattreatment.ThetestresultsaretobetotheSurveyorsatisfaction.
1.7.4Magneticparticleordyepenetranttestingistobecarriedoutontheforgings.
1.7.5Unlessotherwiseagreed,theaccuracyandverificationofdimensionsaretheresponsibilityofthemanufacturer.
1.8Quality
Allforgingsaretobefreefromsurfaceorinternaldefects,whichbeprejudicialtotheirproperapplicationinservice.
1.9Identification
Forgingsaretobeclearlymarkedbythemanufacturerinatleastoneplacewiththeparticularsdetailedintheappropriatespecificrequirements.Thefollowingdetailsaretobeshownonallforgings,whichhavebeenaccepted:
a）Identificationnumber,castnumberorothermarkingwhichwillenablethefullhistoryoftheforgingtobetraced.
b）BVorBV’sRegisterandtheabbreviatednameofBV’slocaloffice.
c）PersonalstampofSurveyorresponsibleforinspection.
d）Testpressure,whereapplicable.
e）Dateoffinalinspection.
1.10Certification
ThemanufactureristoprovidetheSurveyorwithawrittenstatementgivingthefollowingparticularsforeachforgingorbatchofforgings,whichhasbeenaccepted:
a）Purchaser’snameandordernumber.
b）Descriptionofforgingsandsteelquality.
c）Identificationnumber.
d）Steelmakingprocess,castnumberandchemicalanalysisofladlesamples.
e）Generaldetailsofheattreatment.
f）Resultsofmechanicaltests.
g）Testpressure,whereapplicable.
1.11Attacheddrawings
1.11.1Intermediateshaft:
Notes:
1）Theoutlinesizes（thickline）indicatedonthedrawingtobesizesafterroughmachining.
2）Number:
1
3）Weight:
~8764kg
1.11.2Propellershaft:
Notes:
1）Theoutlinesizes（thickline）indicatedonthedrawingtobesizesafterroughmachining.
2）Number:
1
3）Weight:
~10830kg
1.11.3Reamingbolt（I）:
Notes:
1）Theoutlinesizes（thickline）indicatedonthedrawingtobesizesafterroughmachining.
2）Number:
24
3）Weight:
~17kg
1.11.4Reamingbolt（II）:
Notes:
1）Theoutlinesizes（thickline）indicatedonthedrawingtobesizesafterroughmachining.
2）Number:
24
3）Weight:
~19kg
1.11.5Hydraulicnutbody:
Notes:
1）Theoutlinesizes（thickline）indicatedonthedrawingtobesizesafterroughmachining.
2）Number:
1
3）Weight:
~892kg
1.11.6Hydraulicnutpiston:
Notes:
1）Theoutlinesizes（thickline）indicatedonthedrawingtobesizesafterroughmachining.
2）Number:
1
3）Weight:
~104kg
1.11.7Sterntubeseat:
Notes:
1）Theoutlinesizes（thickline）indicatedonthedrawingtobesizesafterroughmachining.
2）Number:
1
3）Weight:
~500kg
1.11.8Bearingseat:
Notes:
1）Theoutlinesizes（thickline）indicatedonthedrawingtobesizesafterroughmachining.
2）Number:
1
3）Weight:
~2600kg
2.Coppercasting
2.1General
Thefairwatercapistobemadefromcopperalloyswithtensilestrengthlevelof590N/mm2.Onepieceforpership.
2.2Manufacture
AllcastingsaretobemanufacturedatfoundriesapprovedbyBV.
2.3Chemicalcomposition
Thechemicalcompositionofsamplesfromeachcastistocomplywiththerequirementsgiveninthefollowingtable（%）:
Alloydesignation
Cu
Sn
Zn
Pb
Ni
Fe
Al
Mn
gradeCu3
77~82
0.1
1.0
0.03
3.0~6.0
2.0~6.0
7.0~11.0
0.5~4.0
2.4Heattreatment
2.4.1Attheoptionofthemanufacturer,castingsmaybesuppliedinthe“ascast”orheattreatedcondition.
2.4.2Ifanyweldsaremadeinthecasting,stressreliefheattreatmentisrequiredinordertominimizetheresidualstresses.
2.5Testmaterial
2.5.1Thetestsamplesaretobeofthekeelblocktype,generallyinaccordancewiththedimensionsrecommendedbyBVandaretobecastinmouldsmadeofthesametypeofmaterialasthatusedforthecastings.
2.5.2Themethodandproceduresfortheidentificationofthetestspecimens,andthecastingstheyrepresent,aretobeagreedwiththeSurveyor.Theidentificationmarksaretobetransferredandmaintainedduringthepreparationoftestspecimens.
2.6Mechanicaltests
Theresultsofthesetestsaretocomplywiththefollowingrequirements:
Alloydesignation
0.2%proofstressminimum
N/mm2
Tensile
strength
minimum
N/mm2
Elongation
on
5.65So%
minimum
GradeCu3
245
590
16
2.7Inspectionandnon-destructiveexamination
2.7.1Allfinishedcastingsaretobesub
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