A302 Qib D yog manganese -molybdenum-nickel alloy steel phaj tsim tshwj xeeb rauwelded boilersthiabcov hlab ntsha siab. Nws muaj nuj nqis rau nws lub zog siab thiab ua haujlwm ntev hauv siab - ib puag ncig siab.
Chemical Composition (%):
|
Qib / Khoom siv |
Element |
Composition(Max-A, Min-I) |
|
A302 Qib D / A302 GrD |
C |
A:0.20 |
|
Mn |
1.15-1.50 |
|
|
Si |
0.15-0.40 |
|
|
P |
0.035 |
|
|
S |
0.035 |
Mechanical Properties (Mpa)
|
Qib / Khoom siv |
Tensile Test |
Ksi/MPa |
|
A302 Qib D / A302 GrD |
Tensile zog |
80-100/550-690 |
|
Yield zog |
I:50/345 |
|
|
Elongation |
I:17% |
|
|
Impact Test (yog tias muaj) |
|
Core Processing Links & Requirements
Kev kho cua sov (Core Step):
Yuav tsum normalizing + tempering txheej txheem. Normalizing kub yog tswj ntawm 890-950 degree, nrog txaus tuav lub sij hawm (1.5-2.5 teev ib 25mm thickness) kom zoo zoo cua sov ntawm cov hlau phaj. Tempering yog ua tam sim ntawd tom qab normalizing, nrog kub teem ntawm 590-650 degree, ua raws li los ntawm huab cua txias los yog lub cub tawg cua txias rau chav tsev kub, uas txhim kho toughness thiab txo nyob rau hauv kev ntxhov siab.
Txiav & Ua:
Txais siv tshuab txiav (plasma txiav, nplaim txiav) los yog shearing. Nplaim txiav yuav tsum tau preheating rau 80-150℃kom tsis txhob txias tawg. Kev ua haujlwm (khoov, dov) yuav tsum tau ua nyob rau hauv chav tsev kub los yog qis preheating (tsawg dua los yog sib npaug li 200 degree), thiab qhov tsawg kawg nkaus dabtsi yog khoov vojvoog yuav tsum tsis pub tsawg tshaj 1.5 npaug ntawm lub phaj thickness los tiv thaiv cov khoom puas.
Vuam ua haujlwm:
Siv qis-hydrogen electrodes (xws li E7018) lossis submerged arc vuam hlau sib piv cov khoom. Preheat lub hauv paus hlau rau 100-150℃ua ntej welding, thiab ua tom qab vuam thaum tshav kub kub kho (tempering ntawm 580-620 degree) kom tshem tawm vuam kev nyuaj siab thiab tsis txhob weld brittleness. Vuam tam sim no thiab voltage yuav tsum ruaj khov los xyuas kom meej qhov zoo.
Ncej -Kev Ua Haujlwm & Kev Tshuaj Xyuas:
Tshem cov welding spatter thiab burrs tom qab ua tiav, thiab ua kom huv si (derusting, degreasing). Ua tsis yog -kev kuaj kev puas tsuaj (UT, MT) ntawm qhov tseem ceeb los kuaj xyuas qhov tsis xws luag. Xyuas kom lub workpiece ua tiav raws li qhov yuav tsum tau muaj qhov tseeb thiab tsis pom cov kab nrib pleb lossis deformations tshwm sim.
qhov zoo
1. Superior Mechanical Strength
Piv nrog rau lwm yam kev siv cov hlab ntsha siab, A302 Qib D muaj qee qhov siab tshaj tawm lub zog (tsawg kawg 345 MPa) thiab lub zog tensile (550-690 MPa) hauv nws chav kawm. Qhov no tso cai rau cov engineers tsim cov qauv sib dua thiab ua haujlwm zoo dua yam tsis muaj kev cuam tshuam txog kev nyab xeeb.
2. Txhim kho Toughness ntawm Nickel
Qhov txhais tau zoo ntawm Qib D dhau Qib A thiab B yog qhov sib ntxiv ntawm npib tsib xee (0.67% - 1.03%).
Impact Resistance: Nickel ho txhim kho cov khoom toughness, tshwj xeeb tshaj yog nyob rau hauv qis kub.
Ductility: Nws tso cai rau cov hlau kom ncav cuag lub zog siab yam tsis tau ua nkig, uas yog qhov tseem ceeb rau kev tiv thaiv kev puas tsuaj loj hauv cov hlab ntsha.
3. Zoo Weldability
Txawm hais tias nws cov ntsiab lus siab alloy, A302 Qib D yog tsim los kom yooj yim welded siv cov txheej txheem kev lag luam. Qhov no ua rau nws yog qhov kev xaiv zoo tshaj plaws rau kev tsim cov boilers complex thiab loj - teev cia tso tsheb hlau luam.
4. Kev tiv thaiv ib puag ncig hnyav
Thaum tshav kub kub Resistance: Kev suav nrog molybdenum ua rau cov hlau tsis kam mus rau softening ntawm qhov kub thiab txias thiab txhim kho nws creep kuj.
Hydrogen Resistance: Nws muaj kev tiv thaiv zoo heev rau hydrogen-induced cracking (HIC), ua rau nws zoo tagnrho rau hydrogenation units thiab reactors hauv refineries.
5. Versatility hauv kev kho mob
Cov khoom siv teb zoo rau ntau yam kev kho cua sov. Thaum uas feem ntau muab raws li - dov, nws tuaj yeem ua rau ib txwm muaj lossis kev ntxhov siab- tau tso siab ntxiv los kho nws cov qauv nplej thiab txhim kho qhov kev ruaj ntseg rau cov ntawv thov tseem ceeb.
Supply & Manufacturing Details
Lub Xeev:Feem ntau muab nyob rau hauv raws li - dov mob, tab sis daim hlau tuab dua 50 hli feem ntau yuav tsum normalizing.
Hom Dimensions:Cov neeg muab khoom zoo li TJC Steel muab cov thicknesses ntawm 4mm txog 400mm.
Kev Xeem Ntxiv:Feem ntau dhau los ntawm Kev Ntsuas Ultrasonic (UT), Charpy V-Kev Ntsuam Xyuas Qhov Teeb Meem, lossis Simulated Post-Weld Heat Treatment (PWHT) rau lub hom phiaj- cov haujlwm tseem ceeb.
Tiv tauj peb ntawm beam@gneesteelgroup.com rau tus nqi, kev txhawb nqa, lossis kev daws teeb meem. Peb yeej ib txwm npaj los txhawb koj qhov project.
Dab tsi yog qhov cuam tshuam toughness ntawm A302 Qib D ntawm chav tsev kub?
Nyob rau hauv chav tsev kub, nws Charpy V-notch feem toughness yog tsawg kawg yog 27 J (20 ft-lb). Qhov no ua kom cov hlau tuaj yeem tiv taus qhov cuam tshuam tam sim ntawd yam tsis muaj kev puas tsuaj, txhim kho cov khoom siv kev nyab xeeb.
A302 Qib D puas tuaj yeem siv rau hauv qhov chaw qis - qhov kub thiab txias? Qhov ntsuas kub ntawm qhov kev pabcuam tsawg kawg yog dab tsi?
Nws tsis zoo rau ultra- qhov kub thiab txias tab sis tuaj yeem siv mus rau -20℃(-4℃F) nrog kev kho cua sov kom zoo. Hauv qab no qhov kub thiab txias, nws qhov cuam tshuam toughness yuav txo qis, yog li kev ntsuas kub qis yog pom zoo rau cov ntawv thov.
Dab tsi yog tus qauv specification uas A302 Qib D ua raws?
Nws ua raws li ASTM A302 / A302M, tus qauv tsim los ntawm American Society for Testing and Materials (ASTM) rau qis- alloy steel phaj rau cov hlab ntsha siab, qhia txog cov tshuaj muaj pes tsawg leeg, cov khoom siv kho tshuab, thiab cov kev xeem.
Dab tsi yog qhov tuab tuab ntawm A302 Qib D daim hlau?
Cov tuab tuab yog 6 hli txog 200 hli. Cov phaj tuab tuaj yeem xav tau kev kho cua sov tshwj xeeb kom ntseeg tau tias cov khoom siv kho tshuab tsis sib xws thoob plaws tag nrho cov ntoo khaub lig-section, ntsib cov khoom siv sib txawv tsim cov kev xav tau.
A302 Qib D ua haujlwm li cas ntawm kev tiv thaiv corrosion?
Nws muaj nruab nrab corrosion kuj rau atmospheric thiab me me corrosive media. Rau qhov hnyav corrosive ib puag ncig (xws li, acidic lossis alkaline media), ntxiv kev tiv thaiv kev tiv thaiv corrosion (xws li pleev xim lossis galvanizing) raug pom zoo.
Cov kev xeem twg siv los txheeb xyuas qhov zoo ntawm A302 Qib D?
Cov txheej txheem kev sim muaj xws li kev ntsuas tensile, kev ntsuas lub zog, qhov ntsuas qhov cuam tshuam (Charpy V-notch), kuaj hardness, tshuaj lom neeg muaj pes tsawg leeg (spectroscopy), thiab tsis yog- kuaj kev puas tsuaj (ultrasonic, radiographic).
Qhov txawv ntawm A302 Qib D thiab A302 Qib B yog dab tsi?
Qhov sib txawv tseem ceeb nyob hauv cov ntsiab lus carbon thiab cov khoom siv tshuab: Qib D muaj C siab dua (0.20-0.28% vs 0.15-0.23% rau B) thiab siab dua tensile/yield zog, ua rau nws haum rau high-pressure, high-load daim ntaub ntawv.
A302 Qib D puas tuaj yeem ua tau txias-? Yuav tsum tau ceev faj dab tsi?
Nws tuaj yeem ua tau txias- tsim, tab sis nrog kev ceev faj: tsis txhob deformation ntau dhau los tiv thaiv cov kab nrib pleb, ua qhov nruab nrab annealing yog tias xav tau los kho cov ductility, thiab kuaj xyuas qhov tsis xws luag tom qab tsim kom muaj kev ncaj ncees ntawm cov qauv.
Dab tsi yog qhov nyuaj ntawm A302 Qib D tom qab kev kho cua sov?
Tom qab normalizing thiab tempering, nws Brinell hardness (HB) ranges ntawm 137 mus rau 187. Qhov hardness tshuav nyiaj li cas ua kom zoo machinability thiab hnav tsis kam, haum rau kev ua haujlwm tom ntej thiab ntev - kev pabcuam.
Puas yog A302 Qib D haum rau boiler nruas raug?
Yog, nws yog dav siv rau boiler nruas manufacturing. Nws siab -kub tsis kam, siab tensile zog, thiab zoo weldability raws li nruj raws li qhov yuav tsum tau ntawm boiler nruas khiav hauj lwm nyob rau hauv siab kub thiab nruam tshav kub.