Raws li tau paub dav dav hauv kev lag luam steel phaj,A516 GR 70steel phaj yog cov khoom siv dav siv, tshwj xeeb tshaj yog nyob rau hauv cov hlab ntsha siab, petrochemicals, tsim hluav taws xob, thiab lwm yam. Thaum muab cov phaj hlau no, ib qho ntawm cov kev txhawj xeeb tseem ceeb rau ntau tus neeg siv khoom yog: Dab tsi yog nws qhov kub thiab txias? Puas yog nws qhov kev ua tau zoo hloov ntawm qhov kub thiab txias? Niaj hnub no, Yuxin Steel muab cov lus piav qhia ntxaws txog qhov kub thiab txias rau A516 GR 70, pab koj txiav txim siab sai yog tias nws ua tau raws li koj daim ntawv thov.
Ua ntej, cov lus teb tseem ceeb: Raws li ASTM A516 / A516M tus qauv thiab kev paub txog kev lag luam, tus qauv kev ua haujlwm kub rau A516 GR 70 steel phaj yog -30℃txog 350 degree. Qhov no sawv cev rau nws qhov kev nyab xeeb tshaj plaws thiab ruaj khov kev pab cuam lub sijhawm, ua rau nws nyiam ntau yam rau feem ntau ntawm kev ua haujlwm. Qhov no ib txwm ua rau cov lus nug: Vim li cas qhov tshwj xeeb no? Cov teeb meem dab tsi tshwm sim thaum ua haujlwm sab nraud?
Raws li cov pa roj carbon steel tshwj xeeb tsim rau nruab nrab- thiab qis-kub siab cov hlab ntsha, ib qho ntawm A516 GR 70 qhov zoo tshaj plaws yog nws qhov tsis tshua muaj siab -kub toughness. Qhov no kuj yog nws qhov tseem ceeb qhov txawv ntawm cov pa roj carbon zoo tib yam. Muaj ntau cov hlau phaj ua nkig heev nyob rau hauv qis - qhov kub thiab txias ib puag ncig, zoo li iav - lawv tawg yooj yim nyob rau hauv txawm me ntsis kev cuam tshuam sab nraud. Txawm li cas los xij, los ntawm kev tswj hwm nruj thiab ua kom zoo li qub, A516 GR 70 tswj kev ua haujlwm zoo ntawm -30 degree, ua tiav lub zog muaj zog tshaj 27J. Qhov no ua tau zoo txo qhov kev pheej hmoo ntawm nkig tawg hauv qhov kev pabcuam qis.
Xav txog qhov no tiag tiag - piv txwv hauv ntiaj teb: Hauv Tuam Tshoj cov cheeb tsam txias sab qaum teb, lub caij ntuj no kub ib txwm poob mus rau ib puag ncig -20 degree, nrog rau qee thaj chaw mus txog -30℃. Liquefied petroleum gas (LPG) cia tso tsheb hlau luam tsim nrog A516 GR 70 steel daim hlau rau lawv cov plhaub sab nrauv tuaj yeem tiv taus qhov kub thiab txias tsis muaj teeb meem kev nyab xeeb vim huab cua txias. Rau cov ntawv thov uas yuav tsum tau ua haujlwm ntawm qhov kub qis dua (xws li -45 degree), qhov cuam tshuam lub zog tuaj yeem txhim kho kom siab tshaj 40J los ntawm kev cog lus cog lus, ua rau nws tsim nyog rau cov xwm txheej cryogenic xws li LNG cia tso tsheb hlau luam. Txawm li cas los xij, cov xwm txheej zoo li no poob rau sab nraud ntawm tus qauv ntsuas kub thiab tsim nyog rau kev tsim khoom.
Tam sim no xav txog qhov siab -kub kawg- 350℃siab txwv.
A516 GR 70 boasts lub zog tensile ntawm 485-620 MPa thiab lub zog tawm los ntawm tsis pub tsawg tshaj 260 MPa. Nyob rau hauv siab - qhov kub thiab txias ib puag ncig hauv qab 350 degree, nws lub zog, hardness, thiab weldability nyob ruaj khov yam tsis muaj qhov muag muag lossis deformation. Piv txwv li, nyob rau hauv distillation yees nyob rau hauv kev lag luam petrochemical, sab hauv siab -kub roj thiab roj feem ntau ncav cuag 300℃. Siv A516 GR 70 rau kev tsim kho ntauwd ua rau nws tiv taus ob qho tib si siab - kub siab thiab tiv taus nruab nrab corrosion, kom ntseeg tau ntev - lub sijhawm ua haujlwm ruaj khov. Ib yam li ntawd, nyob rau hauv boiler nruas ntawm thermal fais fab nroj tsuag kev khiav hauj lwm ntawm kwv yees li 300℃thiab 10 MPa siab, nws muab ruaj khov kev ua tau zoo, kev ruaj ntseg cov cuab yeej.
Nws yog ib qho tseem ceeb kom nco ntsoov tias A516 GR 70 qhov kev ua tau zoo degrades mus dhau 350 degree. Tshwj xeeb, nws lub zog poob qis heev, ua rau muaj kev cuam tshuam rau thermal deformation thiab nkag mus. Kuv ntseeg tias kev siv sijhawm ntev hauv ib puag ncig uas dhau qhov siab tshaj - qhov ntsuas kub no yuav ua rau lub neej luv luv thiab tuaj yeem ua rau muaj kev nyab xeeb. Piv txwv li, nyob rau hauv qhov tseem ceeb heev - qhov kub ntawm boiler seem uas kub ntau tshaj 400 degree, A516 GR 70 yog tsis tsim nyog. Nws raug nquahu kom hloov nws nrog cov ntawv tshwj xeeb steel uas muaj qhov siab tshaj -kub tsis kam.
Tshaj li tus qauv ntsuas kub ntau, ntau cov ntsiab lus ua haujlwm tau lees paub.
- Ua ntej, qhov kub hloov pauv ntawm A516 GR 70 cuam tshuam nrog phaj tuab. Rau cov phaj siab tshaj 25mm nyob rau hauv thickness, txheej sampling thiab kuaj yuav tsum tau los xyuas kom meej lub toughness ntawm cov khoom qhov chaw raws li specifications. Qhov no tiv thaiv kev ua haujlwm tsis sib xws hauv cov phaj tuab ntawm qhov kub thiab txias.
- Qhov thib ob, nws qhov ntsuas kub kuj tseem nyob ntawm kev ua haujlwm siab thiab qhov nruab nrab cuam tshuam. Piv txwv li, nyob rau hauv ntub dej H₂S corrosive ib puag ncig, txawm nyob rau hauv lub -30℃mus rau 350℃ntau yam, phaj hardness yuav tsum tau tswj tsawg dua los yog sib npaug rau 200 HB los tiv thaiv hydrogen-induced cracking.
- Thib peb, rau qhov kub tsis tshua muaj siab (qis dua -60 degree), Yuxin Steel pom zoo kom hloov nws nrog A537 Cl.1 lossis 9% nickel steel rau kev txhim kho kev ruaj ntseg.
Thaum kawg, cia peb xaus. A516 GR 70 tus qauv kev ua haujlwm kub yog -30℃txog 350℃. Nyob rau hauv qhov ntau, nws muaj kev sib npaug ntawm lub zog, toughness, thiab weldability, xa cov nqi zoo dua -kev ua tau zoo dua li cov pa roj carbon zoo tib yam thiab qee yam stainless hlau. Nws yog cov khoom siv zoo tshaj plaws rau nruab nrab - rau-tsawg kub siab cov hlab ntsha, petrochemical, thiab kev siv hluav taws xob tsim hluav taws xob. Yog tias koj qhov kev ua haujlwm poob qis hauv qhov ntsuas kub no thiab xav tau kev nyab xeeb thiab ruaj khov, A516 GR 70 yog qhov kev xaiv tsim nyog. Hloov pauv, yog tias qhov kub thiab txias tshaj qhov ntau, peb xav kom sab laj tus kws tshaj lij steel phaj los tshawb nrhiav cov kev daws teeb meem raws li koj qhov kev ua haujlwm tshwj xeeb.
Nyem lub pob hauv qab no hu rau peb. Peb pab neeg technical yuav muab cov kev daws teeb meem. Raws li tus kws tshaj lij steel phaj tsum, peb muab ntau yam kev qhia tshwj xeeb xyoo - puag ncig. Xav nug tau txhua lub sijhawm-peb cov kws tshaj lij muab ib qho - ntawm - ib qho kev pab.
