Q620DthiabQ690D yog ob qho tib si D - qib qis- alloy siab - lub zog steels hauv Suav teb. Lawv ob leeg yuav tsum tau ua kom tau raws li qhov yuav tsum tau ua kom muaj zog ntawm -20 degree, uas yog siv dav hauv kev tsim khoom thiab kev tsim vaj tsev. Txawm li cas los xij, muaj qhov sib txawv ntawm 70MPa hauv lawv lub zog tawm los, uas ua rau muaj qhov sib txawv ntawm cov tshuaj lom neeg muaj pes tsawg leeg, kev siv thev naus laus zis, daim ntawv thov scenarios thiab nqi.
Ob leeg steels txais yuav tsawg-carbon thiab micro- alloying tsim, tab sis Q690D muaj ib tug ntau refined cov ntsiab lus piv thiab nruj me ntsis tswj ntawm teeb meem impurities kom ua tau zoo dua lub zog thaum kom toughness. Qhov kev sib piv tshwj xeeb yog raws li hauv qab no:
| Element | Q620D | Q690D |
|---|---|---|
| Cov pa roj carbon (C) | Tsawg dua lossis sib npaug li 0.20% (qee qhov qauv yuav tsum Tsawg dua lossis sib npaug li 0.18%) | Tsawg dua los yog sib npaug rau 0.20% (tswj ntawm qib qis kom tsis txhob muaj qhov toughness txo) |
| Silicon (Si) | Tsawg dua lossis sib npaug li 0.60% | Tsawg dua lossis sib npaug li 0.60% |
| Manganese (Mn) | Tsawg dua lossis sib npaug li 1.80% | Tsawg dua los yog sib npaug li 1.80% (txhim kho hardenability thiab lub zog los ntawm kev daws teeb meem ntxiv zog) |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.035% (siab - cov khoom kawg tuaj yeem ua tsawg dua lossis sib npaug li 0.020%) | Tsawg dua lossis sib npaug li 0.030% |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.035% (siab - cov khoom kawg tuaj yeem ua tsawg dua lossis sib npaug li 0.010%) | Tsawg dua lossis sib npaug li 0.020% (qee qhov siab - cov khoom kawg tuaj yeem ua tsawg dua lossis sib npaug li 0.015%) |
| Cov hlau alloy | Feem ntau ntxiv Nb, V, Ti, thiab txhim kho lub zog los ntawm kev ua kom zoo ntawm cov nplej thiab nag lossis daus | Raws li lub hauv paus ntawm Nb, V, Ti, cov ntsiab lus ntawm micro - alloy ntsiab raug kho. Piv txwv li, Nb Tsawg dua lossis sib npaug rau 0.06%, V Tsawg dua lossis sib npaug rau 0.12%, Ti Tsawg dua lossis sib npaug li 0.20%, uas ua rau muaj kev sib koom ua ke ntawm cov nplej refinement thiab nag lossis daus. |
Obvious Gap hauv Mechanical Properties
Qhov sib txawv tseem ceeb ntawm ob lub steels yog nyob rau hauv lub zog tawm los. Lub caij no, kuj tseem muaj qhov sib txawv ntawm lub zog tensile thiab qis - qhov kub thiab txias cuam tshuam, uas txiav txim siab lawv qhov sib txawv ntawm qhov sib txawv - cov kabmob muaj peev xwm:
| Mechanical Property Indicator | Q620D | Q690D |
|---|---|---|
| Yield zog | Ntau dua lossis sib npaug rau 620MPa (rau thickness Tsawg dua lossis sib npaug li 50mm) | Ntau tshaj los yog sib npaug rau 690MPa (rau thickness Tsawg dua los yog sib npaug rau 50mm, me ntsis fluctuates nrog qhov nce ntawm phaj thickness) |
| Tensile zog | 710 - 880MPa | 770 - 940MPa |
| Elongation | Ntau dua lossis sib npaug li 15% (qee yam khoom tuaj yeem ncav cuag Ntau dua lossis sib npaug li 16%) | Ntau dua lossis sib npaug li 14% (qee yam khoom lag luam tuaj yeem ncav cuag 17%) |
| Impact toughness ntawm -20 degree | Lub zog cuam tshuam loj dua lossis sib npaug rau 34J, thiab qee qhov siab - cov khoom lag luam tuaj yeem ncav cuag Ntau dua lossis sib npaug rau 55J | Lub zog cuam tshuam loj dua lossis sib npaug ntawm 34J, thiab qee qhov siab - cov khoom kawg tuaj yeem ua tiav qhov kev ua tau zoo ntawm -40 degree |
Qhov sib txawv ntawm Kev Siv Tshuab
Ob lub steels tuaj yeem tsim tau los ntawm kev tswj cov dov thiab tswj cov txheej txheem txias, tab sis Q690D muaj cov kev xav tau ntau dua rau cov txheej txheem tswj kom muaj kev ruaj ntseg ntawm ultra-siab zog, thiab kev ua haujlwm nyuaj dua me ntsis.
- Q620D: Nws cov txheej txheem ntau lawm yog qhov sib npaug thiab yooj yim los txhawb. Nws tuaj yeem ruaj khov tsim los ntawm cov txheej txheem tswj dov thiab tswj cua txias (TMCP). Nws qhov sib npaug ntawm cov pa roj carbon tsawg dua los yog sib npaug li 0.45%, thiab tsis tas yuav tsum muaj kev ua kom sov ua ntej thaum vuam. Ordinary gas shielded vuam tuaj yeem ua tau raws li qhov yuav tsum tau ua. Rau daim hlau tsawg dua los yog sib npaug li 30 hli, txias dabtsi yog khoov tuaj yeem nqa ncaj qha yam tsis muaj preheating, uas yog tsim rau loj - batch ntau lawm thiab tuaj yeem txo lub voj voog ntau lawm.
- Q690D: Nws xav tau kev tswj cov txheej txheem nruj dua nyob rau theem smelting. Nws feem ntau yog siv lub tshuab hluav taws xob los yog hluav taws xob arc rauv smelting, ua ke nrog LF thiab VD rauv rau sab nrauv refining txheej txheem los txhim kho lub purity ntawm molten hlau. Rau cov phaj tuab, normalizing lossis quenching thiab tempering kev kho cua sov kuj yuav tsum tau ua kom zoo dua cov qauv. Thaum vuam, qis - hydrogen vuam cov ntaub ntawv yuav tsum tau xaiv. Rau cov phaj tuab, nws yog ib qho tsim nyog yuav tsum tswj cov cua sov kom zoo kom tsis txhob poob ntawm cov tawv nqaij los ntawm cov nplej ntxhib hauv cov tshav kub - cuam tshuam, thiab tom qab - vuam kev ntxhov siab txo kev kho cua sov tuaj yeem nqa tawm yog tias tsim nyog.
Qhov txawv ntawm Daim Ntawv Thov Scenarios
Qhov sib txawv ntawm lub zog ua rau ob lub steels muaj qhov sib txawv nyob rau hauv daim ntawv thov scenarios. Q620D yog taw qhia rau nruab nrab - thiab siab - load Cheebtsam, thaum Q690D yog siv ntau dua rau cov tub ntxhais load-cov kabmob, thiab muaj qhov zoo dua hauv cov cheeb tsam txias.
- Q620D: Nws yog tus nqi -kev xaiv zoo hauv thaj chaw nruab nrab - thiab siab - lub zog engineering. Nyob rau hauv lub tshav pob ntawm engineering machinery, nws yog siv los tsim lub chassis ntawm nruab nrab - tonnage loaders thiab thav ntawv ntawm me me thiab nruab nrab - cranes loj. Nyob rau hauv lub tshav pob ntawm lub tsev, nws yog siv rau lub load- bearing Cheebtsam ntawm dav dav loj - span rhiav thiab qhov sib txuas ntawm cov cua fais fab yees nyob rau hauv av. Hauv kev lag luam tshuaj lom neeg, nws tuaj yeem siv los ua qhov nruab nrab - cov kav dej siab txhawb nqa, uas tuaj yeem txo cov phab ntsa thickness ntawm cov khoom piv nrog cov tsoos steel thiab txuag steel noj.
- Q690D: Nws yog cov khoom siv tseem ceeb rau hnyav - lub luag haujlwm thiab qis - kub tiv thaiv cov khoom. Hauv kev ua haujlwm ntawm thee mine machinery, nws hloov Q550 - cov ntaub ntawv qib rau thee mine hydraulic kev txhawb nqa, nce kev ua haujlwm ntawm cov kab ke ntawm 8000kN txog 12000kN. Nyob rau hauv lub teb ntawm engineering machinery, nws yog siv rau boom ntawm 56 - meter twj tso kua mis tsheb thiab chaw nres nkoj cranes, uas yuav txo tau qhov hnyav ntawm cov khoom los ntawm 23%. Hauv thaj chaw ntawm kev tsim kho nyob rau sab qaum teb Suav teb, nws yog siv rau kev txhawb nqa seismic ntawm super siab - nce cov tsev thiab cov chaw tseem ceeb ntawm cov choj, thiab nws qhov qis - qhov kub thiab txias tuaj yeem ua kom tsis txhob tawg tawg thaum lub caij ntuj no txias.
Qhov txawv ntawm Kev Ua Lag Luam thiab Tus Nqi
Qhov sib txawv ntawm cov txheej txheem nyuaj thiab cov txheej txheem teeb tsa ua rau cov nqi lag luam thiab cov qauv ntawm ob lub hlau sib txawv heev.
- Q620D: Nws cov txheej txheem ntau lawm yog paub tab, thiab ntau qhov nruab nrab - steel mills tuaj yeem paub ntau lawm. Lub khw muag khoom txaus. Nws tus nqi kuj yog nruab nrab vim nws tsis tas yuav ntxiv ntau cov ntsiab lus alloy thiab cov txheej txheem tswj tus nqi qis. Nws yog dav siv nyob rau hauv dav dav siab - lub zog tej yaam num, thiab kev lag luam xav tau ruaj khov, uas yog haum rau tej yaam num uas tsis muaj nqi thiab kev ua tau zoo.
- Q690D: Tus nqi ntawm smelting thiab refining yog siab vim kev tswj nruj ntawm kev puas tsuaj impurities thiab optimization ntawm micro - alloy element ratio. Nws tus nqi lag luam yog kwv yees li 15% - 25% siab dua li ntawm Q620D. Nws yog tsim los ntawm qhov tseem ceeb loj - nplai steel mills. Nws qhov kev thov yog tsom rau hauv siab - kawg teb xws li thee mine hydraulic txhawb nqa thiab loj - tonnage engineering machinery. Nrog rau kev loj hlob tas mus li ntawm cov cuab yeej tsim khoom hauv tsev, nws maj mam hloov cov ntaub ntawv zoo sib xws, thiab tus nqi kom zoo dua piv nrog cov ntaub ntawv tuaj txawv teb chaws yog pom tseeb dua.
Cov ntsiab lus tseem ceeb rau kev xaiv cov khoom
- Rau qhov qis - qhov kub thiab nruab nrab - cov haujlwm thauj khoom: Xws li cov thav duab ntawm cov cranes me thiab cov khoom thauj -cov qauv ntawm cov kev cob qhia zoo tib yam hauv cov nroog sab qaum teb, Q620D yog qhov nyiam. Nws tuaj yeem ua tau raws li qhov pib qis - kub thiab thauj khoom- cov kev xav tau ntawm cov kabmob, thiab cov nqi qis dua thiab kev tsim kho tuaj yeem tswj tau tag nrho cov peev txheej ntawm qhov project.
- Rau hnyav - load thiab hnyav qis - qhov kub thiab txias: Xws li cov thee mine hydraulic txhawb nqa thiab cov boom ntawm cov twj tso kua mis loj, Q690D yuav tsum raug xaiv. Nws ultra - lub zog siab tuaj yeem txo qhov hnyav ntawm cov khoom siv thaum txhim kho cov load - bearing peev. Nyob rau tib lub sijhawm, nws qhov ruaj khov qis - qhov kub thiab txias tuaj yeem zam qhov kev pheej hmoo ntawm kev nyab xeeb los ntawm kev ua haujlwm hnyav.
- Thaum hloov cov ntaub ntawv: Yog tias Q620D yuav tsum tau hloov nrog Q690D, cov txheej txheem vuam yuav tsum tau hloov kho, xws li siv cov khoom siv qis - hydrogen vuam thiab tswj cov vuam cua sov input. Yog tias Q690D hloov nrog Q620D, nws yog ib qho tsim nyog los xyuas seb lub zog ntawm cov qauv ua tau raws li qhov yuav tsum tau ua, thiab nws tsis pom zoo kom hloov nws hauv cov khoom tseem ceeb -cov kabmob.
Dab tsi yog qhov sib txawv ntawm cov khoom siv kho tshuab ntawm Q620D thiab Q690D, thiab nws cuam tshuam li cas rau lawv daim ntawv thov?
Lub ntsiab sib txawv yog nyob rau hauv yield zog. Q620D muaj qhov tsawg kawg nkaus tawm lub zog ntawm Ntau dua lossis sib npaug rau 620MPa, thaum Q690D nce siab dua lossis sib npaug rau 690MPa (rau thickness Tsawg dua lossis sib npaug rau 50mm). Q690D kuj muaj lub zog tensile siab dua me ntsis (770-940MPa vs 710-880MPa rau Q620D). Qhov kev sib txawv ntawm lub zog no ncaj qha txhais lawv daim ntawv thov: Q620D yog qhov tsim nyog rau qhov hnyav dav dav - thauj khoom nrog cov kev xav tau ntawm lub zog nruab nrab, thaum Q690D yog tsim los rau cov tub ntxhais thauj khoom- cov kabmob uas yuav tsum tau tiv taus ultra-siab loads thiab hnyav qis-kub ib puag ncig.
Dab tsi yog qhov txawv ntawm qhov yuav tsum tau vuam ntawm Q620D thiab Q690D thaum lub sij hawm ntawm -qhov chaw tsim kho?
Cov kev xav tau vuam sib txawv heev vim lawv qhov sib npaug ntawm cov pa roj carbon monoxide thiab lub zog. Rau Q620D, nrog cov pa roj carbon sib npaug Tsawg dua lossis sib npaug li 0.45%, cov phaj nyias (tsawg dua lossis sib npaug li 20mm) tuaj yeem welded yam tsis muaj preheating, thiab cov pa roj zoo tib yam - cov ntaub thaiv vuam (xws li ER50-6) txaus; preheating kub rau tuab daim hlau (Ntau tshaj los yog sib npaug rau 30mm) tsuas yog yuav tsum tau 100-150 degree, thiab tsis muaj post-weld kev kho cua sov yog yuav tsum tau rau cov feem. Rau Q690D, qis- cov khoom siv hydrogen vuam yuav tsum tau siv los tiv thaiv cov kab mob khaub thuas; preheating kub rau tuab daim hlau yuav tsum tau nce mus rau 150-200 degree, thiab vuam kub input yuav tsum nruj me ntsis tswj nyob rau hauv 15-25kJ / cm. Tsis tas li ntawd, tom qab vuam hydrogen tshem tawm kev kho cua sov yog qhov yuav tsum tau ua rau cov khoom tseem ceeb ntawm cov kabmob kom ntseeg tau tias kev ua haujlwm ruaj khov.
Thaum tsim ib lub rooj cob qhia loj -span rhiav nyob rau sab qaum teb Tuam Tshoj cheeb tsam nrog qhov kub thiab txias ntawm -20 degree, yuav xaiv li cas ntawm Q620D thiab Q690D?
Qhov kev xaiv yog nyob ntawm lub rooj cob qhia cov khoom thauj -cov kev cai thiab pob nyiaj siv. Yog tias nws yog ib qho kev cob qhia zoo tib yam nrog qhov ncua sij hawm tsawg dua lossis sib npaug li 30m thiab tsis muaj cov cuab yeej hnyav (xws li cov tshuab crane me), Q620D yog tus nqi ntau dua - siv tau- nws tuaj yeem ua tau raws li qhov qis - qhov kub thiab txias qhov yuav tsum tau ua thiab tswj tag nrho cov nqi tsim nyog. Yog tias lub rooj cob qhia muaj qhov ntev dua lossis sib npaug li 40m lossis xav tau cov cuab yeej hnyav (piv txwv li, loj-tonnage gantry cranes), Q690D yog qhov kev xaiv zoo dua. Nws lub zog tawm los ntau dua tuaj yeem txo tus ntoo khaub lig- ntu ntu ntawm cov khoom siv truss, txuag chaw hauv pem teb, thiab txhim kho cov qauv kev ruaj ntseg nyob rau hauv qis - qhov kub thiab txias alternating stress.