1. Metallurgical Integrity: Dab tsi yog qhov txiaj ntsig tshwj xeeb ntawm kev qhia "forged bar" dhau ntawm "rolled bar" rau loj -inch Hastelloy B-3 Cheebtsam hauv kev siv cov hlab ntsha tseem ceeb?
Q: Peb tab tom tsim lub loj - txoj kab uas hla flange (20" OD) los ntawm Hastelloy B-3 rau lub high-pressure hydrochloric acid reactor. Peb tus neeg muag khoom muaj ob qho kev xaiv "rolled bar" thiab "forged bar".
A: Rau qhov tseem ceeb ntawm qhov loj me thiab qhov kev pabcuam hnyav, kev xaiv ntawm dov bar thiab forged bar yog qhov tseem ceeb ntawm cov nplej ntws, sab hauv suab, thiab cov khoom anisotropic. Lub forged bar yog yuav luag qhov tseeb engineering xaiv.
Kev tsim khoom sib txawv:
Rolled Bar: Ua los ntawm kev hla ib daim ntawv hlais los ntawm kev hloov cov yob kom txo tau nws tus ntoo khaub lig-section. Lub deformation feem ntau yog nyob rau hauv ib qho kev taw qhia (longitudinal). Qhov no tsim:
Directional Grain Structure: Cov nplej yog elongated nyob rau hauv cov kev taw qhia dov.
Anisotropic Properties: Mechanical zog (lub zog, ductility, toughness) yog txawv nyob rau hauv lub longitudinal kev taw qhia piv rau transverse (los ntawm - tuab) kev taw qhia.
Centerline Segregation: Hauv cov kab uas loj dua, qhov nruab nrab ntawm qhov bar yuav muaj cov chemistry sib txawv los yog suav nrog ntau tshaj qhov saum npoo.
Forged Bar: Ua los ntawm compressive deformation siv tus tuag lossis rauj. Lub billet yog ua hauj lwm nyob rau hauv ntau cov lus qhia ( chim siab thiab kos tawm). Qhov no tsim:
Multidirectional Grain Flow: Cov nplej tau ua kom zoo dua qub thiab taw qhia nyob rau hauv ntau cov lus qhia, tom qab lub contour ntawm ib feem.
Isotropic Properties: Cov khoom muaj ntau dua nyob hauv txhua qhov kev qhia.
Consolidated Center: Lub forging kev txiav txim kaw nrog porosity thiab lov li segregation, ua rau ib tug denser, ntau homogeneous khoom.
Vim li cas nws tseem ceeb rau koj 20 "Flange:
Los ntawm -Thickness Strength (Z-Kev taw qhia): Lub flange muaj kev nyuaj siab. Qhov "Z-kev taw qhia" (los ntawm lub thickness, qhov twg bolts siv load) yog qhov yooj yim tshaj plaws. Nyob rau hauv ib lub dov bar, Z- cov khoom taw qhia yog cov neeg pluag tshaj plaws vim tias cov nplej sib xyaw ua ke mus rau qhov chaw. Nyob rau hauv ib lub forged bar, lub multidirectional grain ntws muab zoo Z- kev taw qhia lub zog thiab ductility, tiv thaiv "lamellar tearing" nyob rau hauv bolt load.
Ultrasonic Soundness: Rau 20 "txoj kab uas hla flange, qhov tsis xws luag sab hauv yog qhov txaus ntshai tiag tiag. Forged tuav tau ua haujlwm tseem ceeb uas "welds kaw" ib qho porosity sab hauv lossis micro-shrinkage. Rolled tuav yuav khaws qhov tsis xws luag hauv nruab nrab.
Corrosion Resistance: Hauv HCl kev pabcuam, txhua qhov kev suav nrog lossis cais thaj chaw yog qhov chaw pib muaj peev xwm rau corrosion. Lub homogenized qauv ntawm ib tug forged bar nthuav tawm ib tug uniform, defect -dawb nto rau cov kua qaub.
Specification:
Thaum txiav txim, qhia meej "Hastloy B-3 Forged Bar, tshuaj annealed, ib ASTM B335, nrog rau kev kuaj ultrasonic ib A388." Qhov no ua kom koj tau txais cov khoom ua tiav tag nrho, tshuaj xyuas cov khoom tsim nyog rau cov khoom tseem ceeb uas muaj lub siab.
2. Forging txheej txheem Parameters: Dab tsi yog qhov tseem ceeb ntawm kev tswj qhov kub thiab txias uas yuav tsum tau thaum forging loj Hastelloy B-3 tuav los tiv thaiv kev tawg lossis tsis xav tau nag lossis daus theem?
Q: Peb lub khw forge muaj kev paub dhau los nrog cov hlau tsis muaj steel, tab sis qhov no yog peb qhov kev txiav txim thawj zaug rau Hastelloy B-3 tuav (8 "inch).
A: Forging Hastelloy B-3 yog qhov xav tau ntau dua li cov hlau tsis muaj steel vim nws qhov nqaim ua haujlwm kub thiab nws qhov rhiab heev rau theem nag lossis daus. Deviating los ntawm cov kev txwv tsis pub yuav ua rau cov pob zeb tawg los yog cov khoom kawg uas tsis zoo corrosion kuj.
Qhov ntsuas kub tseem ceeb Windows:
Soaking / Reheating Temperature (Rau Limit):
Ntau yam: 1150℃txog 1200℃(2100℃F txog 2190℃F).
Kev pheej hmoo siab tshaj 1200 degree: Kev loj hlob ntau dhau ntawm cov qoob loo thiab cov qoob loo ciam teb melting. Cov khoom ua "hluav taws" thiab puas irreparably puas - nws yuav tawg thaum forging thiab yuav tsum tau muab pov tseg.
Forging pib kub:
Lub hom phiaj: 1150℃(2100℃F).
Lub billet yuav tsum tau muab tshem tawm los ntawm lub cub tawg ntawm qhov kub thiab txias no sai sai mus rau lub xovxwm los yog rauj.
Forging Finish Temperature (Lower Limit):
Yam tsawg kawg nkaus: 950℃(1740℃F).
Txoj Cai Tseem Ceeb: Tsis txhob ua rau qis dua 950 degree. Hauv qab no qhov kub thiab txias, cov khoom ua haujlwm - hardening rate skyrockets. Kev tiv thaiv rau deformation nce ntau, thiab kev ntxhov siab sab hauv tsim, ua rau forging tawg.
Thaj Chaw Txaus Ntshai (qis dua 850 degree): Yog tias koj txuas ntxiv mus rau hauv qhov no, koj yuav muaj kev pheej hmoo pib qhov kev txiav txim siab (embrittlement) lossis ua rau muaj teeb meem cuam tshuam rau theem.
Vim li cas Qhov Qhov rai no nqaim:
Muab piv rau cov hlau tsis muaj steel (uas feem ntau tuaj yeem raug forged mus rau 850 degree), B-3 muaj qhov nqaim "kub ua haujlwm" qhov rais-tsuas yog txog 200℃ntawm kev nyab xeeb ua haujlwm. Qhov no yuav tsum muaj sijhawm teem sijhawm thiab ua haujlwm sai dua.
Tswv yim Forging tswv yim:
Reheating: Yog hais tias qhov kub thiab txias poob ze 1000 degree, nres forging tam sim ntawd thiab rov ua dua. Tsis txhob sim "ib qho ntxiv."
Cov Cuab Yeej Siv Hluav Taws Xob: Xyuas kom cov billet yog tsau kom huv si. Cov chaw txias txias yuav ua rau tawg.
Lubrication: Siv iav-raws li lubricants ntawm cov tuag kom txo tau cov cua sov los ntawm lub billet rau cov cuab yeej thiab tiv thaiv kom txhob lo.
Txo qhov piv txwv: Ua kom muaj kev txo qis tag nrho txaus (tsawg kawg 3: 1) txhawm rau rhuav tshem cov qauv nrum los ntawm cov pob zeb thiab ua kom tiav tag nrho wrought, nplua - cov qauv nplej hauv qhov kawg bar.
Ncej -Forging:
Tom qab forging, cov tuav yuav tsum tau rov ua dua - kev daws teeb meem (1060-}1120 degree) thiab quenched sai heev los kho cov mos mos, corrosion-resistant microstructure thiab txo cov seem seem ntawm forging.
3. Ultrasonic Test Requirements: Rau qhov tseem ceeb rotating khoom shafts ua los ntawm Hastelloy B-3 forged bar, dab tsi ASTM tus qauv tswj xyuas ultrasonic, thiab dab tsi tsis xws luag yuav tsum tau teev tseg?
Q: Peb tab tom machining lub compressor ncej los ntawm ib tug loj - txoj kab uas hla Hastelloy B-3 forged bar. Qhov no yog ib qho tseem ceeb rotating tivthaiv. Peb yuav tsum qhia kom meej ultrasonic soj ntsuam ntawm raw bar. Dab tsi ASTM tus qauv siv, thiab cov qauv kev lees paub dab tsi ua kom ntseeg tau?
A: Rau lub voj voog tig, qhov uas qaug zog lub neej yog qhov tseem ceeb, kev kuaj xyuas ultrasonic tsis yog ib qho kev kuaj xyuas zoo xwb - nws yog ib qho kev nyab xeeb - qhov tseem ceeb. Qhov tseeb specification thiab kev lees paub yuav cuam tshuam ncaj qha rau cov khoom tiv thaiv kom tsis txhob qaug zog.
Txoj Cai Tswjfwm:
Thawj tus qauv rau kev soj ntsuam ultrasonic ntawm wrought npib tsib xee alloy tuav yog ASTM A388 / A388M (Txoj Cai Xyaum rau Ultrasonic Examination ntawm Steel Forgings). Thaum sau rau hlau, nws yog universally siv rau nickel alloy forgings thiab.
Supplementary Standards:
Nyob ntawm koj qhov kev lag luam, koj tuaj yeem siv tau:
ASTM E2375 (Txoj Cai Xyaum rau Ultrasonic Examination ntawm Wrought Products)
SEP 1921 (German tus qauv, feem ntau siv rau cov khoom siv sib hloov tseem ceeb)
Kev lees txais (Qhov Kev Txiav Txim Siab Tseem Ceeb):
ASTM A388 piav qhiaua li casmus kuaj, tab sis tsis yogkev lees txais. Koj yuav tsum qhia cov no hauv koj daim ntawv xaj khoom. Rau lub compressor ncej, ntawm no yog cov yuav tsum tau:
Calibration Notch:
Qhia ib sab -drilled qhov (SDH) los yog tiaj-lub qhov hauv qab (FBH) rau calibration.
Hom rhiab heev: 1.2 hli (3/64 ") txoj kab uas hla FBH los yog sib npaug.
Kev lees txais qib (Raws li ASTM E2375, Table 1):
Chav Kawm 1 (Qhov Zoo Tshaj Plaws): Tsis muaj ib tus neeg qhia ntau dua 50% ntawm qib siv. Tsis muaj linear indications. Qhov no yog ib qho tseem ceeb rau rotating shafts.
Chav Kawm 2 (High Quality): Tsis muaj ib tus neeg qhia ntau dua 100% ntawm qib siv. Tej zaum yuav ua tau rau cov ntu tseem ceeb tsawg.
Specific Defect Rejection Criteria:
Individual Indications: Ib qho kev qhia tshaj qhov kev siv amplitude (xws li, 1.2mm FBH) yog ua rau kev soj ntsuam. Yog tias nws tsis tuaj yeem ua pov thawj tsis muaj tseeb, lub bar yuav tsis lees paub.
Linear Indications: Ib qho kev qhia tawm (kawg-zoo li) ntawm ib qho amplitude feem ntau ua rau kev tsis lees paub tam sim, tsis hais qhov loj me.
Ntau Cov Lus Qhia: Ib cheeb tsam uas muaj ntau qhov qhia me me (clustering) yuav qhia tau tias muaj kev sib cais thiab yuav tsum tsis kam lees.
Xaus- Cov txiaj ntsig nplej thiab pob txha: Qhia meej tias qhov kev tshuaj xyuas yuav tsum npog tag nrho cov ntim, suav nrog thaj tsam ze ntawm - thaj chaw saum npoo av (hauv 5% ntawm txoj kab uas hla ntawm qhov chaw), siv cov txheej txheem tshwj xeeb los kov yeej "zoned tuag."
Kev pom zoo rau koj daim ntawv xaj khoom:
*"Hastelloy B-3 forged bar yuav tsum tau kuaj ultrasonically raws li ASTM A388. Kev lees txais yuav tsum yog ASTM E2375, Chav Kawm 1, nrog rau 1.2mm txoj kab uas hla tiaj-hauv qab qhov siv tus qauv. Tsis muaj cov kab qhia tau tso cai. Daim ntawv sau qhia suav nrog cov phiaj xwm scan thiab cov ntawv qhia qhia yuav tsum muab. "*
4. Kev Tshawb Fawb Kev Kho Kub Kub: Tom qab cov tshuaj annealing loj Hastelloy B-3 forged tuav, tus fabricator yuav ua li cas thiaj li paub tseeb tias qhov kev kho cua sov ua haujlwm tau zoo thiab tias lub bar tsis muaj embrittling theem?
Q: Peb tau txais cov khoom xa tuaj ntawm loj -inch Hastelloy B-3 forged bars (10" txoj kab uas hla) rau ib qho tseem ceeb reactor Cheebtsam. MTR hais tias "kev daws teeb meem annealed." Yuav ua li cas peb, raws li ib tug fabricator, yuav ua li cas los xyuas kom meej tias cov tshav kub kho tau zoo nyob rau hauv tag nrho cov hla ntu, tsis yog saum npoo?
A: Koj qhov kev tsis ntseeg yog noj qab nyob zoo. Rau cov kab loj - txoj kab uas hla, kom ntseeg tau tias qhov kev daws teeb meem zoo ib yam thoob plaws ntawm tus ntoo khaub lig- ntu yog qhov nyuaj. Qhov nruab nrab ntawm 10 "bar txias qeeb dua ntawm qhov chaw, thiab yog tias qhov quench qeeb lossis tsis txaus, qhov chaw tuaj yeem muaj cov theem embrittling thaum qhov kev ntsuam xyuas saum npoo zoo. Ntawm no yog cov txheej txheem pov thawj:
Kev pheej hmoo ntawm Ineffective Annealing:
Centerline Precipitation: Yog hais tias lub bar txias heev dhau los ntawm 850-550℃ntau, lub chaw yuav muaj mu-phase lossis xaj xaj.
Residual Cold Work: Yog tias qhov txo qis forging tau ua tiav ntawm qhov kub thiab txias, qhov chaw yuav khaws cov qauv ua haujlwm.
Cov txheej txheem pov thawj:
Hardness Testing (Thawj Kab Ntawm Kev Tiv Thaiv):
Txoj kev: Ua cov kev ntsuam xyuas hardness (Rockwell B lossis C) ntawm qhov kawg bar, ntawm qhov chaw, nruab nrab - vojvoog, thiab ze ntawm qhov chaw.
Acceptable Range: Fully annealed B-3 should be 95 HRB maximum (typically 85-95 HRB). If the center is significantly harder than the surface (>5 ntsiab lus HRB qhov txawv), xav tias tsis tiav annealing.
Microstructural Examination (Destructive, but Definitive):
Txoj kev: Yog tias koj muaj lub sijhawm fij tseg, txiav ib lub hlais hlais. Polish thiab etch (siv ib qho haum molybdenum- nplua nuj alloy etch, zoo li muriatic acid + hydrogen peroxide).
Yuav Nrhiav Tau Dab Tsi: Ib qho kev ua kom tiav tag nrho yuav tsum qhia cov nplej equiaxed nrog cov menyuam ntxaib annealing. Qhov tsis muaj cov qauv lis deformed thiab qhov tsis muaj qhov tsaus ntuj -etching grain ciam teb precipitates (mu-theem) lees paub kev kho kom raug.
Khoov Test (Qualitative):
Txoj Kev: Yog tias ua tau, siv cov qauv me me thiab ua ib qho kev ntsuas khoov.
Txais tau: Ib tus qauv B-3 tag nrho yuav tsum khoov 180℃yam tsis muaj kev tawg. Brittle fracture qhia tias embrittlement.
Corrosion Testing (Qhov kawg pov thawj rau HCl Service):
ASTM G28 (Txoj Kev A): Qhov no yog tus qauv ntsuas rau kev kuaj xyuas qhov cuam tshuam rau intergranular corrosion nyob rau hauv npib tsib xee - nplua nuj, chromium- cov kabmob alloys. Thaum B-3 muaj chromium tsawg, qhov kev ntsuam xyuas tseem tuaj yeem pom los nag.
Kev cia siab: Ib qho kev ua kom zoo B-3 yuav tsum muaj qhov corrosion ntawm tsawg dua 0.5 mm / xyoo nyob rau hauv boiling ferric sulfate-sulfuric acid tov. Tus nqi siab dua qhia tias nag lossis daus thiab kev kho cua sov tsis zoo.
Ultrasonic Backscatter Techniques:
Cov txheej txheem UT Advanced tuaj yeem kuaj pom cov kev hloov pauv hauv cov qauv nplej thiab muaj cov theem thib ob los ntawm kev txheeb xyuas cov suab nrov backscattered. Qhov no yog ib txoj hauv kev tshwj xeeb NDT tab sis tuaj yeem teev tseg rau cov kab tseem ceeb.
Tswv yim pom zoo:
Rau 10 "txoj kab uas hla tseem ceeb, ua qhov nyuaj profileing hla lub ntsej muag kawg. Yog tias tsis sib xws, lees txais. Yog tias muaj lus nug, ua ASTM G28 corrosion testing ntawm tus qauv trepanned los ntawm qhov chaw.
5. Traceability & Certification: Rau kev siv nuclear lossis kev siv tshuaj siv Hastelloy B-3 forged bars, cov ntaub ntawv tshwj xeeb (tshaj li tus qauv MTR) yuav tsum ua kom txaus siab rau kev soj ntsuam xyuas?
Q: Peb tab tom muab Hastelloy B-3 forged bars rau cov tshuaj API reactor. Cov neeg siv kawg tab tom thov "tag nrho traceability" thiab "EN 10204 3.1 ntawv pov thawj." Peb tus txheej txheem zeb MTR zoo li ua tau raws li qhov no, tab sis lawv thov ntau dua. Lawv xav tau dabtsi?
A: Hauv kev tswj hwm kev lag luam (nuclear, tshuaj, aerospace), daim ntawv qhia Mill Test (MTR) feem ntau tsis txaus. Qhov yuav tsum tau ua rau "tag nrho traceability" thiab cov ntawv pov thawj tshwj xeeb qhia txog qhov xav tau ntawm cov ntaub ntawv pov thawj uas cov khoom raug tsim, sim, thiab txheeb xyuas raws li kev tswj xyuas, nrog rau kev saib xyuas kom meej.
Nkag siab EN 10204:
Cov txheej txheem European no txhais cov hom ntaub ntawv tshuaj xyuas:
EN 10204 2.2: Ib nqe lus hais txog kev ua raws li kev txiav txim. Cov chaw tsim khoom tshaj tawm tias cov khoom ua tau raws li qhov yuav tsum tau ua, tab sis tsis muaj kev ntsuam xyuas tshwj xeeb. Qhov no feem ntau yog tsis tsim nyog rau cov khoom tseem ceeb.
EN 10204 3.1: Ib daim ntawv pov thawj tshuaj xyuas uas cov chaw tsim khoom tshaj tawm tias cov khoom siv tau ua raws li cov kev xav tau ntawm kev txiav txim thiab muab cov ntawv xeem tshwj xeeb. Qhov tseem ceeb, kev tshuaj xyuas yog ua los ntawm cov chaw tsim khoom ntawm tus kheej tsim nyog department (ywj siab ntawm ntau lawm).
EN 10204 3.2: Ib daim ntawv pov thawj tshuaj xyuas qhov kev tshuaj xyuas yog ua los ntawm ib tug thib peb - tog (tus neeg soj ntsuam ywj siab lossis tus neeg sawv cev ntawm cov neeg siv khoom) ntxiv rau cov chaw tsim khoom cov kev xeem. Qhov no yog qib siab tshaj ntawm daim ntawv pov thawj.
Rau koj daim ntawv thov tshuaj, EN 10204 3.1 yog tus qauv tsawg kawg nkaus.
Dab tsi "Full Traceability" Entails:
Tshaj li hom ntawv pov thawj, "tag nrho traceability" txhais tau tias koj tuaj yeem txuas txhua qhov forged bar rov qab mus rau nws keeb kwm. Qhov no yuav tsum tau:
Thaum tshav kub kub Traceability: Txhua tus neeg bar yuav tsum tau cim lub cev (stamped los yog tagged) nrog rau tus xov tooj cua sov.
Tus Kheej Bar Mapping: Daim ntawv pov thawj MTR / 3.1 yuav tsum sau cov cim qhia tshwj xeeb ntawm txhua daim ntawv pov thawj.
Txheej Txheem Traceability: Cov ntaub ntawv yuav tsum muaj xws li:
Qhov chaw ntawm Raw Material: Tus neeg muag khoom ntawm tus thawj billet.
Forging Parameters: Cov lus qhia dav dav hais tias forging tau ua nyob rau hauv qhov tsim nyog tsis tau (qhov kub thiab txias, piv txwv).
Cov ntaub ntawv kho cua sov: Sijhawm- cov kab kos kub lossis cov lus qhia paub meej txog kev daws teeb meem annealing voj voog (kub, sijhawm so, quench method).
Cov txiaj ntsig Kev Ntsuas Cov Ntawv Qhia rau Bars: Yog tias kev sim ua kom puas (tensile, hardness, corrosion) tau ua los ntawm cov qauv los ntawm ntau, daim ntawv pov thawj yuav tsum qhia tias tus qauv twg los ntawm, lossis hais tias qhov kev ntsuam xyuas yog tus sawv cev ntawm ntau.
Cov Khoom Siv Zoo (PMI): Qee qhov kev qhia tshwj xeeb yuav tsum muaj cov ntaub ntawv pov thawj tias PMI (txuas tes XRF lossis OES) tau ua tiav ntawm txhua lub bar txhawm rau txheeb xyuas chemistry, txawm tias cov cua sov tau ntawv pov thawj.
Yuav Thov Li Cas ntawm Koj Daim Ntawv Yuav Khoom:
Txhawm rau kom txaus siab rau koj cov neeg siv khoom, suav nrog qhov no ntawm koj qhov kev txiav txim rau lub zeb:
"Cov ntaub ntawv yuav tsum tau muab nrog EN 10204 Hom 3.1 kev soj ntsuam daim ntawv pov thawj. Tag nrho cov traceability rau cov cua sov yog yuav tsum tau, nrog rau txhua bar qhia ib tug neeg. matrix txuas cov qhabnias xeem rau tus kheej bar qhia yuav tsum muab. "
Qhov no ua kom koj tau txais cov ntaub ntawv pov thawj uas yuav tsum tau ua kom dhau qhov kev tshuaj xyuas kev lag luam tshuaj.
