Cov ntsiab lus ntawm Q620D yog dab tsi

Nyob rau hauv hierarchy ntawm qis- alloy siab - lub zog steels,Q620Dnyob rau hauv ib qho tseem ceeb niche: nws txuas qhov sib txawv ntawm nruab nrab - qib zog xws li Q550D thiab ultra- siab- kev xaiv lub zog zoo li Q690D, xa qhov tsis tshua muaj qhov sib npaug ntawm620MPa- theem tawm lub zog, txhim khu kev qha -20℃toughness, thiab hassle-free processability. Tsis zoo li cov hlau uas tseem ceeb rau ib qho kev ntsuas kev ua tau zoo dua lwm tus, Q620D tau tsim kho kom ua tau zoo hauv cov xwm txheej uas hnyav hnyav thiab huab cua txias sib tsoo- ua rau nws yog ib qho tseem ceeb hauv high-kawg engineering tej yaam num uas tsis ua hauj lwm yog ib qho kev xaiv.

Qhov zoo tshaj plaws ntawm Q620D yog nws lub zog tawm los, uas yog 13% siab dua Q550D. Tab sis nws qhov tseeb tus nqi yog nyob rau hauv yuav ua li cas nws tswj toughness thiab weldability thaum ntaus lub hom phiaj siab - lub zog. Qhov no tau ua tiav los ntawm ob qho kev xaiv tsim qauv tseem ceeb:

• Ultra-Txoj kev tswj tsis muaj dej tsis huv: Q620D txwv nruj dua rau cov sulfur (Less dua lossis sib npaug rau 0.010%) thiab phosphorus (Less dua lossis sib npaug li 0.020%) dua Q550D (S Tsawg dua lossis sib npaug li 0.025%, P Tsawg dua lossis sib npaug li 0.030%). Cov kab hauv qab no yog cov neeg ua txhaum loj tom qab kev sib xyaw ua ke thiab lamellar tearing- qhov tsis zoo uas ua rau muaj kev puas tsuaj loj hauv huab cua txias. Los ntawm kev txiav cov impurities, Q620D ua kom muaj kev ua haujlwm zoo ib yam thoob plaws nws cov tuab, txawm tias cov phaj tuab txog 150mm.
• Microalloy Synergy Tshaj Carbon: Es tsis txhob boosting zog nrog cov ntsiab lus siab carbon (uas ruins weldability), Q620D cia siab rau ib tug cocktail ntawm niobium, vanadium, thiab titanium. Cov ntsiab lus no tsim tau zoo precipitates uas pin lis ciam teb thaum dov, refining microstructure mus rau hauv ib tug tawv bainite - dominated matrix. Qhov tshwm sim yog qhov sib npaug ntawm cov pa roj carbon tsawg dua los yog sib npaug li 0.45%-tsawg txaus kom tsis txhob preheating rau feem ntau cov haujlwm vuam, txawm tias cov phaj tuab.

Q620D cov cuab yeej siv tshuab tsis yog cov lej kuaj xwb-lawv txhais tau cov txiaj ntsig zoo rau cov engineers thiab fabricators:

• Toughness Thaum Nws Tseem Ceeb: Ntawm -20 degree, nws lub zog cuam tshuam ntau dua lossis sib npaug rau 55J-ntau tshaj li 34J qhov xav tau ntawm Q550D. Qhov no txhais tau hais tias nws tuaj yeem ua rau lub caij ntuj no txias nyob rau sab qaum teb Tuam Tshoj, thaj tsam roob, thiab thaj chaw sab nraud yam tsis muaj kev tawg raws li cov khoom hnyav xws li cua daj cua dub, kev co tshuab, lossis dej khov.
• Plasticity rau kev sib sau ua ke: Nrog rau qhov elongation Ntau dua lossis sib npaug li 15% thiab txo qis ntawm thaj tsam Loj dua lossis sib npaug li 45%, Q620D tuaj yeem txias - khoov rau hauv nruj radii thiab tsim rau hauv cov duab nyuaj (xws li crane boom seem lossis choj pob qij txha) yam tsis muaj kev tawg. Qhov no tshem tawm qhov xav tau ntawm cov kub kub kub - txheej txheem tsim, txiav lub sij hawm tsim khoom thiab cov nqi.
• Z-Kev taw qhia lub zog rau Welded Structures: Rau cov khoom siv welded loj xws li choj girders lossis offshore platform tsho, Q620D muaj Z15-Z35 thickness-cov khoom taw qhia. Qhov no tiv thaiv lamellar tearing-ib hom tsis ua hauj lwm nyob rau hauv cov phaj tuab nyob rau hauv los ntawm -thickness stress- ua kom muaj kev ncaj ncees rau ntau xyoo.

Q620D cov txheej txheem tsim khoom yog ua kom zoo kom sib npaug ntawm kev ua tau zoo thiab kev siv yooj yim:

• Thermomechanical Rolling + Quenching -Tempering: Feem ntau Q620D daim hlau yog tsim los siv ob- cov txheej txheem: ua ntej, tswj dov ntawm qhov kub thiab txias kom ua kom cov nplej, tom qab ntawd quenching thiab tempering kom kaw lub zog thiab toughness. Qhov no zam qhov brittleness ntawm raws li - dov siab - lub zog steels thiab ua kom cov khoom sib xws thoob plaws txhua pawg.
• Vuam Tsis muaj Fuss: Ua tsaug rau nws qhov sib npaug qis, Q620D tuaj yeem txuas nrog tus qauv qis-hydrogen electrodes lossis MIG/MAG xov hlau. Rau cov phaj Tsawg dua lossis sib npaug li 40mm tuab, tsis xav tau preheating ntawm chav tsev kub. Rau cov phaj tuab (50-150mm), me me preheat rau 80-100℃yog txaus los tiv thaiv cov kab nrib pleb txias-tsawg dua li 150-200℃preheat yuav tsum tau rau qee qhov ultra- siab- lub zog steels.
• Kev soj ntsuam nruj nruj: Txhua pawg ntawm Q620D dhau 100% ultrasonic flaw nrhiav kom tshem tawm cov teeb meem sab hauv xws li voids lossis inclusions. Qhov no tsis yog - sib tham tau rau cov ntawv thov tseem ceeb xws li kev txhawb nqa nuclear fais fab nroj tsuag lossis ntev - ncua kev txuas choj.

Q620D tsis yog ib qho dav dav -lub hom phiaj steel- nws yog cov khoom tshwj xeeb rau cov haujlwm uas thawb qhov txwv ntawm lub zog thiab kub:

• Heavy-Lub luag haujlwm Engineering Machinery: Nws yog qhov mus- rau kev xaiv rau telescopic crane booms, excavator dipper caj npab, thiab mining tsheb chassis. Nws lub zog siab txo cov khoom hnyav los ntawm 20-30%, boosting roj efficiency thiab lifting muaj peev xwm yam tsis muaj kev xyiv fab durability.
• Ntev-Span Choj & Siab-Rises: Rau cov txuas hniav nrog qhov ntev tshaj 500m thiab skyscrapers tshaj 300m, Q620D yog siv rau hauv cov tub ntxhais load-cov tswv cuab. Nws Z-kev taw qhia lub zog thiab qis- qhov kub thiab txias ua kom cov qauv tuaj yeem tiv taus av qeeg, cua txias, thiab lub caij ntuj no txias.
• Offshore & Cov Khoom Siv Hluav Taws Xob: Nyob rau hauv ntug dej hiav txwv cua turbine yees thiab roj platform tsho, Q620D tiv thaiv ob qhov kev hem thawj ntawm ntsev tsuag corrosion thiab qis - kub brittleness. Nws kuj tseem siv tau rau hauv siab - cov kav dej kub boiler thiab nuclear fais fab nroj tsuag ntim cov qauv, qhov kev nyab xeeb yog qhov tseem ceeb.

Hu rau tam sim no

Lub weldability ntawm Q620D yog dab tsi, thiab dab tsi yuav tsum tau ceev faj thaum vuam?

Nws muaj qhov zoo weldability thiab yog sib xws nrog ntau yam txheej txheem xws li shielded hlau arc vuam thiab roj hlau arc vuam. Rau cov phaj Tsawg dua lossis sib npaug li 40 mm tuab, feem ntau tsis tas yuav tsum tau preheating ntawm chav tsev kub. Rau cov phaj tuab lossis cov txheej txheem welded nyuaj, preheating kom zoo rau 80-100℃tuaj yeem zam qhov sib tsoo txias. Lub caij no, ua kom zoo dua cov vuam tsis zoo thiab siv cov khoom siv qis- hydrogen vuam los txo cov vuam tsis xws luag.

Cov kev lag luam thiab cov xwm txheej twg yog Q620D feem ntau siv hauv?

Nws daim ntawv thov scenarios npog ntau qhov siab - xaus kev lag luam hnyav thiab kev tsim kho. Hauv kev lag luam roj thiab roj, nws yog siv rau siab - roj thiab roj xa mus rau cov kav dej thiab cov khoom siv drilling. Hauv kev lag luam tshuaj, nws tsim nyog rau siab -siab reactors thiab pipelines conveying corrosive media. Hauv kev lag luam hluav taws xob, nws tuaj yeem siv los tsim cov boilers thiab siab -siab cov kav dej. Tsis tas li ntawd, nws kuj tseem siv rau cov khoom tseem ceeb xws li hydraulic thooj voos kheej kheej rau engineering machinery, siab -load txhawb nqa cov qauv rau cov txuas hniav, thiab corrosion- cov hlua tiv thaiv rau cov ntug dej hiav txwv.

Dab tsi yog cov txheej txheem tswj cov ntsiab lus tseem ceeb hauv kev tsim Q620D?

Cov ntsiab lus tswj xyuas tseem ceeb npog ntau theem ntau lawm. High-zoo kub- dov steel strips raug xaiv los ua cov khoom siv raw, uas yog thawj zaug los tshem tawm cov nplais oxide. Nyob rau hauv lub welding theem, optimize siab - zaus welding tsis los xyuas kom meej weld zoo. Nyob rau hauv lub caij txias los yog kub dov theem, tsim nyog tsim ua tiav; Tom qab kos duab txias, qhov nruab nrab annealing yog ua, thiab qhov kub thiab txias yog tswj los ua kom zoo dua cov qauv nplej. Ua ntej xa khoom, cov khoom tiav yuav tsum dhau qhov tensile, cuam tshuam, thiab eddy tam sim no qhov tsis txaus ntseeg kuaj xyuas kom tsis muaj qhov tsis xws luag.

Dab tsi yog qhov txawv ntawm Q620D thiab Q550D, thiab yuav xaiv li cas ntawm lawv?

Qhov sib txawv tseem ceeb yog nyob rau hauv kev tawm dag zog lub zog thiab tswj impurity. Q620D muaj lub zog tawm los ntawm 620 MPa nrog kev txwv nruj dua ntawm cov impurities xws li sulfur thiab phosphorus, muab lub zog siab dua Q550D. Q550D muaj lub zog tawm los ntawm 550 MPa thiab tus nqi siab dua -kev ua tau zoo. Xaiv Q620D rau hnyav- thauj khoom, qis- qhov kub thiab txias cov qauv xws li ntev - txuas txuas txuas thiab cov ntug dej hiav txwv. Rau qhov nruab nrab nruab nrab-load engineering qauv nyob rau hauv temperate ib puag ncig (xws li, me me crane thav duab), Q550D yog kev lag luam ntau dua.