st中华739(739的路线)

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SPECIFICATIONFORSTEELBARS,ALLOY,
HOT-WROUGHT,FORELEVATEDTEMPERATURE
ORPRESSURE-CONTAININGPARTS,ORBOTH
SA-739
[IdenticalwithASTMSpeci?cationA739-90a(Reapproved1995)
?1
.]
3.1.4Dimensions(cross-sectionalshape,size,and
1.1Thisspeci?cationcovershot-wrought,ferritic
length),
alloysteelbarsforelevatedtemperatureorpressure-
containingpartssuitableforfusionweldingorboth.
3.1.5ASTMdesignationanddateofissue,
1.2Thebarsarefurnishedinthefollowinggrades:
3.1.6Grade(Table1),
3.1.7Additionstothespeci?cation,and
GradeB11:1.25%chromium,0.55%molybdenum
GradeB22:2.25%chromium,1.00%molybdenum
3.1.8Enduse.
98
1.3Thevaluesstatedininch-poundunitsaretobe
NOTE1—Atypicaldescriptionisasfollows:10000lb,Ferritic
uesgiveninparentheses
AlloySteelBars,HotWroughtNormalizedandTempered,and
areforinformationonly.
Descaled,erby10ft,ASTMA739dated,
GradeB11,SpecialStraightened,SpecialMachinedFittings.
ncedDocuments
lRequirements
2.1ASTMStandards:
A29A29MSpeci?cationforSteelBars,Carbonand
4.1Materialfurnishedunderthisspeci?cationshall
Alloy,Hot-WroughtandCold-Finished,GeneralRe-
conformtotheapplicablerequirementsofthecurrent
quirementsfor
editionofSpeci?cationA29A29M.
A370TestMethodsandDe?nitionsforMechanicalTest-
ingofSteelProducts
alsandManufacture
5.1MeltingPractice—Thesteelshallbemadeby
ngInformation
oneormoreofthefollowingprimaryprocesses:open-
3.1Ordersformaterialunderthisspeci?cationshould
hearth,basic-oxygen,mary
includethefollowinginformation:
meltingmayincorporateseparatedegassingorre?ning
andmaybefollowedbysecondarymeltingusing
3.1.1Quantity(weightornumberofpieces),

secondarymeltingisemployed,theheatshallbede?ned
3.1.2Nameofmaterial(ferriticalloysteelbars),asalloftheingotsremeltedfromasingleprimaryheat.
3.1.3Condition(hotwrought,normalizedandtem-
5.2Condition—Unlessotherwisespeci?ed,bars
pered,machinestraightenedanddescaled),
shallbehotwrought,heattreated,anddescaled.
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98

SA-7391998SECTIONII
5.3HeatTreatment:nship,Finish,andAppearance
5.3.1Thebarsshallbenormalizedandtempered.
8.1Workmanship—Thebarsshallbefreeof
5.3.2Austenitizingtemperatureshallbewithinthe
pipe,cracks,and?thelimitsofgood
rangefrom1700to1800°F(927to982°C).
manufacturingandinspectionpracticesthebarsshall
befreeofinjuriousseams,laps,segregation,orother
5.3.3Coolingfromtheaustenitizingtemperature
imperfectionswhich,duetotheirnature,degreeor
maybeaccomplishedbycoolinginstillairormoving
extent,willinterferewiththeuseofthematerialin
air,attheproducer’rmittedbythe
machiningorfabrication.
purchaser,coolingfromtheaustenitizingtemperature
maybeacceleratedbysprayorliquidquenching.
8.2Descaling—Unlessotherwisespeci?ed,thebars
shallbedescaled.
5.3.4Theminimumtemperingtemperatureshall
be1200°F(649°C)forGradeB11and1250°F(677°C)
forGradeB22.
?cationandTestReports
9.1Amanufacturer’scerti?cationthatthematerial
alComposition
wasmanufacturedandtestedinaccordancewiththis
6.1Theheatanalysisshallconformtothelimitsfor
speci?cationtogetherwithareportoftheanalysisand
chemicalcompositionspeci?edinTable1forthegrade
tensiontestresultsshallbefurnishedatthetimeof
ordered.
ortshallincludethenameofthe
manufacturer,ASTMdesignationnumberandyeardate
andrevisionletter,ifany,grade,heatnumber,andsize.
icalProperties
7.1TensileRequirements—Thebarsasrepresented
bythetestspecimensshallconformtothetensile
tMarking
requirementsspeci?edinTable2.
10.1Thebarsshallbemarkedinaccordancewith
7.2Specimens—Tensiontestspecimensshallbe
Speci?cationA29A29Mexceptasmodi?edorsupple-
takenlongitudinallyandmachinedfromthelocations
mentedby10.2through10.4ofthisspeci?cation.
speci?edinTestMethodsandDe?nitionsA370.
10.2Whenspeci?edbythepurchaser,theheat
7.3NumberofTests:
numbershallbepermanentlystampedononeendof
gerinnominaldiameter(or
7.3.1Twotensiontestsshallbemadetorepresent
equivalentcross-sectionalarea.
barsofthesamesizefromeachheatineachheat
tinuousheat-treatedmaterial,
10.3Thebarsshallneitherbehotnorcoldstamped
notfewerthantwotensiontestsshallrepresentalot
onthesidesunlessapprovedbythepurchaseronthe
selectedonthebasisofonetensiontestfromeach
purchaseorder.
10000lb(4500kg).
10.4Eachlift,regardlessofsize,shallbetagged
7.3.2Whenheattreatedwithoutinterruptionin
withtheinformationrequiredbySpeci?cationA29
continuousfurnaces,thematerialinalotshallbefrom
A29M.
thesameheat,samepriorcondition,samesize,and
subjectedtothesameheattreatments.
7.4TestMethods—Tensiontestsshallbemadein
ds
accordancewithTestMethodsandDe?nitionsA370.11.1alloysteelbars;high-temperatureapplications;
Theyieldstrengthshallbedeterminedbythe0.2%hot-wroughtsteelbars;pressure-containingparts;steel
;temperatureserviceapplication—high
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98

PARTA—FERROUSMATERIALSPECIFICATIONSSA-739
TABLE1
CHEMICALREQUIREMENTS
Composition,%
Element
Carbon,max
Manganese
Phosphorus,max
Sulfur,max
Silicon
Chromium
Molybdenum
GradeB11
0.05–0.20
0.40–0.65
0.035
0.040
0.50–0.80
1.00–1.50
0.45–0.65
GradeB22
0.05–0.15
0.30–0.60
0.035
0.040
0.50max
2.00–2.50
0.90–1.10
TABLE2
TENSILEREQUIREMENTS
GradeB11
Tensilestrength,ksi(MPa)
Yieldstrength,min,ksi(MPa)
50mm,min,%
Reductionofarea,min,%
70.0–95.0(483–655)
45.0(310)
18
45
GradeB22
75.0–95.0(517–655)
45.0(310)
18
45
1277

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