Dab tsi yog thawj cov tshuaj muaj pes tsawg leeg ntawm ASTM A202 Qib B?
ASTM A202 Qib B yog chromium -manganese- silicon alloy hlau feem ntau siv rau cov hlab ntsha siab. Nws lub ntsiab tshuaj muaj pes tsawg leeg muaj cov pa roj carbon (tsawg dua los yog sib npaug rau 0.25%manganese (0.97-1.52%)silicon (0.54-0.96%)Chromium (0.35-0.60%)), nrog siab tshaj 0.035%rau phosphorus thiab sulfur. Nws yog tsim los rau siab - lub zog yuav tsum tau nyob rau hauv nruab nrab kub.
ASTM A202 Qib B yog cov cuab yeej cuab tam hlau hlau tshwj xeeb tsim tshwj xeeb rau cov hlab ntsha siab thiab cov boilers xav tau lub zog siab dua li cov qauv carbon steel. Nws yog txhais los ntawm nws cov tshuaj sib xyaw ua ke ntawm Chromium, Manganese, thiab Silicon, uas muab cov cuab yeej kho kom zoo ntawm ob qho tib si ambient thiab nruab nrab qhov kub siab. Thaum nws tau raug hloov pauv ntau hauv cov lej niaj hnub los ntawm cov kev qhia tshiab xws li SA537 lossis SA387, nws tseem yog ib qho tseem ceeb siv rau kev kho cov khoom siv hluav taws xob qub thiab cov khoom siv hnyav. Qhov kev xaiv "Qib B" sawv cev rau qhov siab dua - lub zog sib txawv hauv qhov kev qhia tshwj xeeb, muab lub zog tensile yam tsawg kawg nkaus ntawm 85 ksi thiab txhim kho kev tiv thaiv oxidation.
Cov yam ntxwv tseem ceeb
Triple Alloying nyhuv:Siv cov kev sib xyaw ua ke ntawm Cr, Mn, thiab Si los txhim kho hardenability thiab ruaj khov- kev daws teeb meem.
Oxidation Resistance:Cov ntsiab lus Chromium muab cov txheej txheem tiv thaiv oxide zoo dua piv rau cov pa roj carbon monoxide -manganese steels.
Qhov kub thiab txias stability:Khaws cov qauv kev ncaj ncees thiab tiv thaiv softening ntawm qhov kub thiab txias qhov twg carbon steels pib poob tawm lub zog.
Killed Steel Production:Tsim los siv cov kev coj ua tua tag nrho los xyuas kom muaj kev huv huv thiab kev sib haum xeeb ntawm cov khoom siv alloy.
Qib Qib
ASTM:American Society for Testing and Materials.
A:Prefix rau Ferrous (hlau-raws li) cov ntaub ntawv.
202:Tus lej qauv tshwj xeeb rau Cr-Mn-Si alloy steel daim hlau.
Qib B:Lub zog tensile siab dua (85--105 ksi) nyob rau hauv cov lus qhia no.
Kev sib piv (vs. ASTM A516 Qib 70)
Chemical complexity:A202 Qib B yog cov hlau alloy uas muaj Chromium; A516 yog carbon steel feem ntau tsom rau Manganese.
Tensile zog:A202 Qib B (85 ksi min) muaj zog dua A516 Gr 70 (70 ksi min).
Thermal Window:A202 yog tsim los rau kev ruaj ntseg kub dua, qhov A516 yog qhov ua kom zoo rau nruab nrab - mus rau - qis kub toughness.
Weldability:A516 yooj yim dua rau vuam; A202 yuav tsum nruj preheating thiab PWHT vim nws siab dua carbon sib npaug.
Daim Ntawv Thov Kev Sib Tham
Legacy Power Plant Boilers:Siab -sab nruas tshuab tsim nyob rau hauv nruab nrab-20th caug xyoo.
High -Tub kub Exchangers:Plhaub thiab tubesheets qhov nruab nrab oxidation kuj yuav tsum tau.
Industrial Autoclaves:Cov chav ua haujlwm siab siv rau siab - cov txheej txheem kev ntxhov siab.
Chav Manifolds:Distribution headers nyob rau hauv cov laus industrial cua sov tshuab.
Structure Supports rau Furnaces:Cheebtsam raug rau radiant tshav kub thiab yuav tsum tau siab load- bearing peev.
Puas yog ASTM A202 Qib B haum rau siab -kev siv kub?
Yog lawm,ASTM A202 Qib Byog tsim los ua tau zoo hauv qabsiab -qhov kub thiab txias, ua kom haum raucov hlab ntsha siabthiabboilersraug rau qhov kub siab. Kev suav nrogchromiumthiabmolybdenumnyob rau hauv lub alloy txhim kho nwscreep kujthiab txhim kho nwszogntawm qhov kub siab, feem ntau mus txog ib ncig800℃F (427 degree). Qhov no ua rau nws zoo tagnrho rautsim hluav taws xobthiabchemical ua.
Cov tshuaj muaj pes tsawg leeg ntawm ASTM A202 Qib B yog dab tsi?
Covtshuaj muaj pes tsawg leegntawmASTM A202 Qib Bfeem ntau suav nrogCov pa roj carbon (0.18-0.22%), Manganese (0.60-0.90%), Silicon (0.15-0.30%), Chromium (0.90-1.20%), Molybdenum (0.30-0.60%), Phosphorus(Less tshaj los yog sib npaug0.035%), thiabSulfur(Less tshaj los yog sib npaug0.035%). Cov ntsiab lus no muab cov hlau nws xav tauzog, tawv, thiabtiv thaiv corrosionthaum kom ntseeg tau tias nws tuaj yeem ua haujlwm siab -siab thiab siab- cov ntawv thov kub zoo li cov uas pom hauvcov hlab ntsha siabthiabboilers.
Tus nqi rau ASTM A202 Qib B yog dab tsi?
Tus nqi rau ASTM A202 Qib B siab lub nkoj steel daim hlau feem ntau nyob nruab nrab ntawm$700 thiab $1,200 ib tuj, nyob ntawm qhov kev txiav txim ntim thiab tus neeg muag khoom. Kev yuav khoom ntau (100+ tons) tuaj yeem txo tus nqi mus txog $ 800 toj ib tuj, thaum me me, 10-tuj xaj tuaj yeem ze rau $ 1,000 ib tuj.
ASTM A202 Qib B siab lub nkoj steel phaj tshuaj muaj pes tsawg leeg thiab cov cuab yeej cuab tam:
| Qib | Chemical Composition (%) | ||||
| C | Mn Ntau dua lossis sib npaug | Si | P | S | |
| A202 Qib B (A202GRB) | 0.25 | 0.97-1.52 | 0.54-0.96 | 0.035 | 0.035 |
| Qib | Mechanical Property | ||||
| Tensile zog (MPa) | Yield zog (MPa) | % Elongation hauv 2 nti (50mm) min | Impacting Test Temperature (degree) | ||
| A202 Grade B (A202GRB)> | 585-760 | 325 | 18 | -20,40,-60 | |
1 Dab tsi yog qhov cuam tshuam toughness ntawm ASTM A202 Qib B?
Covcuam tshuam toughnessntawmASTM A202 Qib Bfeem ntau yog tsim nyog rau feem ntau nruab nrab mus rau siab - kev siv siab. Thaum nws muaj qhov toughness zoo ntawm qhov kub thiab txias, nws tsis pom zoo raulow-kub sivqhov twg cov khoom yuav ua nkig. Rau ib puag ncig cryogenic los yog tsis tshua muaj kub, lwm yam alloys nyiamASTM A537 Cov Lus Qhia Tshwj Xeebtej zaum yuav haum dua vim lawv superiorcuam tshuam tsis kamnyob rau hauv txias txias.
2 Dab tsi yog qhov weldability ntawm ASTM A202 Qib B?
ASTM A202 Qib Bmuaj zooweldability, tso cai rau nws yuav tsum tau welded siv ntau txoj kev zoo lishielded hlau arc vuam (SMAW), Gas tungsten arc vuam (GTAW), thiabSubmerged arc vuam (SAW). Txawm li cas los xij, vim nwssiab carbon cov ntsiab lus, preheatingthiabpost-weld kev kho cua sov (PWHT)raug pom zoo kom tsis txhob tawg thiab xyuas kom meej ntawm cov pob qij txha welded, tshwj xeeb tshaj yog rauntu tuabhauv kev tsim cov hlab ntsha siab.
3 Dab tsi yog lub zog ntawm ASTM A202 Qib B?
Covyield zogntawmASTM A202 Qib Byog feem ntau50 ksi (345 MPa). Qhov no txhais tau hais tias cov khoom siv tuaj yeem tiv taus kev ntxhov siab txog qib no yam tsis muaj deformation mus tas li. Covyield zog, nrog nwstensile zogthiabtawv, xyuas kom meej tiasASTM A202 Qib Byog haum raulub nkoj siabkev siv qhov twg mechanical loads thiab thermal stresses tseem ceeb, tshwj xeeb tshaj yog nyob rau hauvboilersthiabkub exchangers.
4 Lub zog tensile ntawm ASTM A202 Qib B yog dab tsi?
Covtensile zogntawmASTM A202 Qib Bqhov nruab nrab ntawm70 ksi rau 90 ksi (485 ~ 620 MPa). Qib ntawm tensile lub zog no tso cai rau cov khoom siv los tiv thaiv cov neeg kho tshuab kev ntxhov siab nyob rau hauvsiab -siabib puag ncig. Lub zog, ua ke nrog nwsweldabilitythiabtawv, uaASTM A202 Qib Bhaum rau kev siv hauvcov hlab ntsha siabthiabboilers, tshwj xeeb tshaj yog nyob rau hauv kev lag luam xws lichemical uathiabtsim hluav taws xob.
5 Dab tsi yog qhov ntsuas kub siab tshaj plaws rau ASTM A202 Qib B?
ASTM A202 Qib Byog tsim los ua tau zoo hauv qabsiab -qhov kub thiab txias, ua kom haum raucov hlab ntsha siabthiabboilersraug rau qhov kub siab. Kev suav nrogchromiumthiabmolybdenumnyob rau hauv lub alloy txhim kho nwscreep kujthiab txhim kho nwszogntawm qhov kub siab, feem ntau mus txog ib ncig800℃F (427 degree). Qhov no ua rau nws zoo tagnrho rautsim hluav taws xobthiabchemical ua.
6 Cov kev lag luam twg siv ASTM A202 Qib B?
ASTM A202 Qib Byog dav siv nyob rau hauv kev lag luam xav tau cov ntaub ntawv nrog zoozogthiabthermal tsis kamnyob rau hauv siab -xwm txheej. Cov kev lag luam no suav nrogtsim hluav taws xob, chemical ua, thiabpetrochemicalkev lag luam. Nws yog feem ntau siv nyob rau hauvcov hlab ntsha siab, kub exchangers, thiabboilersqhov twgtsis kam mus rau qhov kub thiab txiasthiabcorrosion kujyog qhov tseem ceeb rau lub sijhawm ntev - kev ntseeg siab thiab kev nyab xeeb hauv cov ntawv thov.
7 Lub hardness ntawm ASTM A202 Qib B yog dab tsi?
CovtawvntawmASTM A202 Qib Bfeem ntau ntog ntawm190-250 HB(Brinell hardness scale), nyob ntawm seb qhov kev kho cua sov tshwj xeeb thiab kev ua haujlwm. Covtawvxyuas kom cov khoom tuaj yeem tiv taushnavthiabpuashauv kev siv lub nkoj siab. Txawm li cas los xij, rau cov ntaub ntawv raughnyav hnyav hnyav, yuav tsum muaj hardness siab dua alloy, nyob ntawm seb cov kev xav tau tshwj xeeb ntawm daim ntawv thov.
Tag nrho cov specification thiab cov ntsiab lus muaj nyob rau ntawm kev thov. Cov ntaub ntawv saum toj no yog muab rau kev taw qhia nkaus xwb. Rau kev tsim tshwj xeeb thov hu rau peb cov neeg ua haujlwm muag khoom
