Ob leegA516 GR 70thiab A516 GR70N yog cov hlau tshwj xeeb rau nruab nrab - thiab qis -kub siab cov hlab ntsha raws li ASTM / ASME cov qauv txheej txheem. Lawv muab cov ntsiab lus zoo ib yam thiab cov ntsiab lus tseem ceeb ntawm lub zog, tab sis "N" cov lus xaus qhia txog cov txheej txheem kev kho cua sov, uas ua rau muaj qhov sib txawv ntawm microstructure, mechanical zog, thiab daim ntawv thov scenarios. Qhov txawv yog nyob rau hauv lawv cov kev kho cua sov, uas nyob rau hauv lem tsim ib tug tier kev ua tau zoo thiab applicability spectrum, precisely txuam ntau haiv neeg cov kev cai. Raws li tus kws tshaj lij steel phaj tsum,Yuxin Steelmuab cov lus piav qhia ntxaws txog lawv qhov sib txawv hauv kab lus no.
I. Cov ntsiab lus txhais thiab cov txheej txheem kho cua sov sib txawv
A516 GR70 yog qib hauv paus, feem ntau xa hauv kub- dov los yog kev ntxhov siab- tau txais kev kho mob yam tsis tas yuav tsum tau ua kom muaj kev noj qab haus huv. Nws cov txheej txheem ntau lawm suav nrog smelting, refining, nruam casting, thiab dov, tso cai rau cov khoom xa tuaj ncaj qha hauv lub xeev kub - dov. Rau cov thicknesses tsawg dua los yog sib npaug li 40 hli, tsis muaj kev kho cua sov ntxiv, nrog rau cov khoom siv kho tshuab tseem ceeb tsuas yog los ntawm kev dov.
Qhov "N" hauv A516 GR70N qhia meej meej "kev kho mob zoo li qub," cais nws raws li cov cua sov ntxiv- kho kom muaj zog qib. Nws yuav tsum tau cua sov rau 920-980℃tom qab cua txias. Kev tswj qhov kub thiab txias thiab tswj cov cua txias kom zoo dua microstructural reconstruction.
Nco ntsoov tias rau cov phaj thicknesses tshaj 40 hli, A516 GR70 feem ntau ua tsis tau raws li tus me nyuam. Conversely, A516 GR70N mandates normalized kev kho mob tsis hais txog ntawm thickness, nrog rau cov ntawv pov thawj meej nyob rau hauv daim ntawv pov thawj zoo.
II. Qhov sib txawv ntawm Microstructure thiab Mechanical Properties
Tus nqi tseem ceeb ntawm cov txheej txheem normalizing yog nyob rau hauv optimizing microstructure thiab cov khoom, uas kuj sawv cev rau qhov tseem ceeb sib txawv ntawm ob.
Raws li - dov microstructure ntawm A516 GR70 feem ntau muaj ferrite thiab pearlite, featuring kuj ntxhib thiab tsis sib npaug ntawm cov nplej. Residual rolling stresses tseem nyob sab hauv, ua rau tsis zoo -kub toughness thiab microstructural stability. Ntawm -29 degree, Charpy V-notch cuam tshuam lub zog feem ntau tsuas yog ua tau raws li qhov yuav tsum tau ua.
Tom qab normalizing kev kho mob, A516 GR70N nthuav tawm cov qauv ua kom zoo dua qub thiab ntau dua cov carbide faib. Qhov no tshem tawm cov kev ntxhov siab sab hauv thiab txo cov khoom siv tawv (tsawg dua lossis sib npaug li 200 HB), ua kom muaj txiaj ntsig zoo tag nrho. Nws qhov qis- qhov kub thiab txias yog qhov zoo heev, nrog rau kev cuam tshuam lub zog tsis tu ncua tshaj 27 J ntawm -46℃. Kev ua haujlwm ntawm hydrogen-induced cracking (HIC) thiab sulfide stress corrosion (SSC) kuj tau txhim kho vim kev txhim kho microstructural purity. Lub zog qaug zog nce los ntawm kwv yees li 15% piv rau A516 GR70, muab kev tiv thaiv ntau dua rau kev hloov pauv thiab qhov kub tsis tshua muaj kev pheej hmoo tawg tawg.
Thaum ob qib sib piv cov ntsuas lub zog sib xws (lub zog tensile 485-620 MPa, yield zog Ntau dua lossis sib npaug rau 260 MPa), A516 GR70N muaj kev ua tau zoo dua kev ruaj ntseg thiab cov khoom sib xws, nrog txo qhov sib txawv piv rau kub dov A516 GR70.
III. Qhov sib txawv ntawm daim ntawv thov scenarios thiab tsim nyog rau kev ua haujlwm
A516 GR70 yog qhov tsim nyog rau qhov kub thiab txias, qhov chaw tsis tshua muaj corrosion, thiab cov ntawv thov uas tsis muaj qhov yuav tsum tau ua rau qis - kub toughness. Piv txwv xws li cov qauv petrochemical cia tso tsheb hlau luam, atmospheric tshav kub exchangers, thiab cov pa pa onshore siab pipelines. Nws tuaj yeem siv tau zoo nyob rau hauv qhov kub thiab txias ntawm chav tsev mus txog 100℃thiab muab tus nqi siab -kev ua tau zoo.
A516 GR70N tshwj xeeb yog tsim los rau qis - kub, siab - siab, thiab corrosive ib puag ncig, ua rau nws xaiv qhov kev xaiv rau huab cua. Hauv kev siv petrochemical, nws tsim nyog rau cov roj av liquefied roj av (LPG) cia tso tsheb hlau luam (-40℃kev ua haujlwm) thiab hydrogen sulfide (H₂S)-muaj desulfurization yees. Nyob rau hauv lub zog tsim sector, nws yog siv los tsim boiler nruas thiab auxiliary khoom rau nuclear fais fab nroj tsuag.
IV. Kev Tswj Xyuas Zoo thiab Tus Nqi Sib Txawv
A516 GR70N tau txais kev tswj hwm nruj dua. Txhua daim ntawv yuav tsum xeem dhau ultrasonic kuaj ua ntej xa khoom xa tuaj (cov ntawv tuab dua 20mm yuav tsum tau Qib I lossis siab dua), nrog rau qhov yuav tsum tau kuaj rau qis- qhov kub thiab txias qhov kev ua tau zoo thiab microstructural uniformity. A516 GR70 tsuas yog yuav tsum tau kuaj xyuas qhov tsis txaus ntseeg thiab ntsuas cov cuab yeej cuab tam.
A516GR70N hais kom 10%-20% tus nqi tshaj A516GR70 vim muaj kev kho cua sov ntxiv thiab cov qauv tshuaj ntsuam xyuas. Txawm li cas los xij, nws khaws cov pa roj carbon steel tus nqi kom zoo dua stainless hlau lossis npib tsib xee-raws li alloys (tsuas yog 1/3 txog 1/2 tus nqi ntawm 304 stainless hlau). Hauv cov haujlwm uas xav tau kev nyab xeeb siab heev, qhov kev ua tau zoo ntawm A516 GR70N zoo txo cov khoom siv tsis ua haujlwm, yog li xa cov txiaj ntsig kev lag luam mus ntev.
V. Summary
Ob qib tseem ceeb sawv cev rau tus qauv hauv paus thiab kev hloov kho kom zoo dua qub, nrog rau lawv qhov kev sib txawv tseem ceeb los ntawm kev hloov kho kev ua tau zoo tau ua tiav los ntawm kev kho kom zoo. Kev xaiv yuav tsum ua tib zoo ua raws li cov kev xav tau ntawm kev ua haujlwm.
Rau cov txheej txheem siab cov hlab ntsha ua haujlwm ntawm qhov kub thiab txias, tsis tshua muaj siab, thiab tsis muaj kev pheej hmoo corrosion, A516 GR70 ua tau raws li qhov yuav tsum tau ua thaum ntsuas tus nqi -kev ua tau zoo thiab kev ua tau zoo.
Rau cov ntawv thov uas muaj qhov kub thiab txias, kub siab, corrosive media, lossis huab cua puag ncig, A516 GR70N yuav tsum raug xaiv. Nws optimized microstructure thiab cov khoom ua kom ntev -cov cuab yeej siv kev nyab xeeb.
Yog tias koj tsis paub meej txog kev xaiv cov hlau phaj tsim nyog, thov qhia koj cov kev xav tau. Peb muab cov kev daws teeb meem customized.
