Raws li lub hnub qub khoom nyob rau hauv qis - alloy siab - lub zog steel tsev neeg,Q690D tau dhau los ua cov khoom tseem ceeb uas tsis tuaj yeem hloov pauv hauv ntau qhov chaw lag luam los ntawm kev tsim txiaj ntawm nws lub zog sib npaug, toughness thiab processability. Sib txawv ntawm huab cua txias heev- tiv taus Q690E thiab lwm qib, nws yog qhov haum rau cov kev xav tau ntawm cov pa txias thiab hnyav- cov xwm txheej thauj khoom. Nws tau pom tias muaj zog siv hauv engineering machinery, khoom siv hluav taws xob thiab kev tsim kho vaj tse. Cov hauv qab no yog cov lus qhia ntxaws ntxaws los ntawm ntau qhov ntev xws li cov yam ntxwv ntawm kev ua tau zoo, kev ua kom zoo dua qub, kev nthuav dav ntawm daim ntawv thov thiab cov lus qhia siv tswv yim.
Parameter Cov Lus Qhia thiab Kev Ua Raws Cai: Lub hauv paus ntawm kev ua haujlwm ruaj khov
Q690D ua raws li Suav tus qauv GB/T 16270 - 2019, thiab txhua feem ntawm nws cov qib coding ncaj qha qhia txog qhov tseem ceeb ntawm kev ua tau zoo. "Q" sawv cev rau lub zog tawm los, "690" qhia tias qhov tsawg kawg nkaus lub zog yog 690MPa thaum lub phaj thickness tsawg dua los yog sib npaug li 50 hli, thiab qib "D" qhia meej meej tias nws yuav tsum dhau Charpy V-notch cuam tshuam kev sim ntawm -20 degree, uas yog siv nyob rau hauv cov ntsiab lus tseem ceeb ntawm cov tshuaj muaj pes tsawg leeg. qis-carbon thiab micro-alloyed optimized formula. Cov ntsiab lus carbon yog nruj me ntsis tswj hauv qab 0.18%, uas tsis yog tsuas yog nteg lub hauv paus rau lub zog siab, tab sis kuj zoo heev txo qhov kev pheej hmoo ntawm txias tawg thaum vuam. Qhov sib ntxiv ntawm niobium, vanadium thiab titanium micro-alloy cov ntsiab lus tsim ib qho kev sib koom ua ke ntawm kev ua kom muaj zog los nag thiab kev ua kom zoo ntawm cov nplej. Nyob rau tib lub sijhawm, cov ntsiab lus tsis zoo phosphorus thiab sulfur raug txwv kom tsawg dua lossis sib npaug rau 0.030% thiab Tsawg dua lossis sib npaug li 0.025% feem. Qee cov khoom siv high-end tuaj yeem tswj tau qis dua 0.015%, kom tsis txhob muaj cov khoom embrittlement. Hais txog cov khoom siv kho tshuab, nws lub zog tensile thaj tsam ntawm 770MPa txog 940MPa, tus nqi elongation tsis tsawg dua 14%, thiab qhov nruab nrab cuam tshuam lub zog ntawm -20℃tsis tsawg dua 47J. Qhov kev sib xyaw ua ke no ua rau nws tiv thaiv ob qho tib si hnyav thiab muaj kev cuam tshuam tam sim ntawd.
Cov cuab yeej cuab tam rau GB / T 16270 Q690D steel phaj:
|
Thickness (hli) |
Yield zog (Ntau dua lossis sib npaug rau Mpa) |
Tensile zog (Mpa) |
Elongation nyob rau hauv ntau dua los yog sib npaug rau , A% |
|
T Tsawg dua lossis sib npaug li 50 |
690 |
770-940 |
14 |
|
50<> |
650 |
760-930 |
|
|
100<> |
630 |
710-900 |
Cov tshuaj muaj pes tsawg leeg rau GB / T 16270 Q690D steel phaj (Kub Ntsuas Max%):
|
Cov ntsiab lus tseem ceeb ntawm GB / T 16270 Q690D steel phaj |
||||||
|
C |
Si |
Mn |
P |
S |
Cu |
Cr |
|
0.20 |
0.80 |
1.80 |
0.025 |
0.015 |
0.50 |
1.50 |
|
Ni |
Mo |
B |
V |
Nb |
Ti |
- |
|
2.00 |
0.70 |
0.005 |
0.12 |
0.06 |
0.05 |
- |
Daim ntawv thov nthuav dav: Los ntawm cov khoom tseem ceeb mus rau qhov tseem ceeb Infrastructure
Q690D tus nqi- kev ua tau zoo piv thiab kev ua haujlwm ruaj khov ua rau nws siv dav hauv ntau qhov chaw, thiab nws tau dhau los ua cov khoom tseem ceeb los txhim kho cov khoom siv tau zoo thiab txo nqi tag nrho.
- Engineering machinery teb: Nws yog cov khoom siv rau cov tub ntxhais bearing qhov chaw ntawm cov khoom hnyav xws li Sany Heavy Industry thiab XCMG. Thaum siv los ua crane booms thiab excavator caj npab, piv nrog cov tsoos Q345 steel, lub thickness ntawm cov khoom yuav raug txo los ntawm 20 - 30% ntawm qhov chaw ntawm tib lub load-cov kabmob muaj peev xwm. Qhov kev tsim lub teeb no tsis tsuas yog txhim kho kev ua haujlwm yooj yim ntawm cov cuab yeej siv tab sis kuj txo cov roj noj thaum ua haujlwm.
- Cov khoom siv hluav taws xob teb: Hauv kev siv roj thiab roj, Q690D seamless kav yog siv los ua siab - cov roj zoo casings thiab cov roj shale gas fracturing pipelines, uas tuaj yeem tiv taus qhov siab ntawm cov av hauv av thiab corrosion ntawm stratum kua. Hauv kev lag luam cua fais fab, nws yog siv los ua cua zog ntauwd connectors thiab flange qhov chaw. Nws tuaj yeem tiv thaiv lub voj voog ntawm lub zog hluav taws xob rau lub sijhawm ntev, thiab kev pabcuam lub neej tau nce ntau dua 30% piv nrog cov hlau zoo tib yam.
- Infrastructure teb: Nyob rau hauv loj - ncua txuas txuas xws li qee lub nroog viaducts thiab kev sib tshuam kev tsheb ciav hlau, Q690D yog siv rau cov tswv cuab chord thiab kab pheeb ces kaum ntawm cov qauv truss. Nws txo tus naj npawb ntawm kev txhawb nqa thaum ua kom muaj peev xwm ntawm tus choj thiab ua kom yooj yim rau kev tsim kho. Tsis tas li ntawd, nws kuj tseem siv rau hauv cov tsheb thauj khoom hnyav thiab cov tub ntxhais kev txhawb nqa ntawm siab -nce steel qauv vaj tsev, uas txhim kho kev tiv thaiv -seismic thiab cua- tiv thaiv kev ua haujlwm ntawm cov qauv.
Lub thickness ntawm Q690D cuam tshuam nws cov khoom siv tshuab li cas?
Cov khoom siv kho tshuab ntawm Q690D qhia txog kev maj mam nqes zuj zus nrog nce thickness. Rau daim hlau nrog thicknessTsawg dua los yog sib npaug li 50mm, qhov tsawg kawg nkaus tawm lub zog yog 690 MPa thiab tensile lub zog ntawm 770-940 MPa. Thaum lub thickness yog50＜t Tsawg dua lossis sib npaug li 100mm, qhov tsawg kawg nkaus yield zog txo mus rau 650 MPa, thiab tensile zog poob mus rau 760-930 MPa. Qhov no yog vim tias cov phaj tuab muaj qhov txias dua thaum lub sij hawm dov, ua rau coarser hauv cov nplej. Txhawm rau them nyiaj rau qhov kev poob qis no, cov tuam ntxhab feem ntau txais yuav quenching thiab tempering kub kho rau tuab Q690D daim hlau kom homogenize lub microstructure thiab xyuas kom ruaj khov.
Dab tsi yog qhov kev thov raug cai ntawm Q690D steel?
Q690D yog dav siv hauv hnyav-cov haujlwm engineering uas xav tau lub zog siab thiab nruab nrab qis-kub tsis kam. Cov ntawv thov ib txwm muaj xws li:
- Kev tsim kho tshuab: Crane booms, qhob twj tso kua mis tsheb outriggers thiab excavator thoob rods, ua tiav 20-30% qhov hnyav txo piv nrog cov pa steels.
- Cov khoom siv hluav taws xob: Cua turbine ntauwd flanges, roj drilling platform yeeb nkab racks thiab siab -cov roj zoo casings, nrog rau kev thauj mus los thiab qhov chaw txias sab nraum zoov.
- Infrastructure: Truss Cheebtsam ntawm loj - ncua txuas hniav, lub ntsiab ncej ntawm siab - nce steel qauv vaj tse thiab seismic kev them nyiaj yug qhov chaw nyob rau hauv cov cheeb tsam txias.
- Heavy - tsheb ua haujlwm: Ncej thiab qag ntawm cov tsheb thauj khoom hnyav thiab cov tsheb thauj khoom loj loj, txhim kho kev thauj khoom -cov kabmob muaj peev xwm thiab kav ntev.
Cov qauv tshuaj ntsuam xyuas zoo li cas yuav tsum tau ua raws li Q690D ua ntej tawm hauv lub Hoobkas?
Q690D yuav tsum dhau qhov kev tshuaj xyuas nruj raws li GB / T 1591-2018 thiab GB / T 16270-2019 tus qauv, suav nrog:
- Tshuaj ntsuam xyuas muaj pes tsawg leeg: Xyuas kom tseeb tias cov ntsiab lus ntawm cov pa roj carbon, manganese, microalloying cov ntsiab lus thiab cov khoom tsis zoo (P Tsawg dua lossis sib npaug rau 0.030%, S Tsawg dua lossis sib npaug li 0.025%) ua tau raws li cov qauv kev cai.
- Kev ntsuam xyuas cov cuab yeej cuab tam: Kev ntsuam xyuas tensile, -20℃kev ntsuam xyuas cuam tshuam thiab kev ntsuas qhov txias txias kom ntseeg tau tias muaj zog, cuam tshuam lub zog thiab kev tsim tau mus txog qib.
- Tsis yog -kev kuaj kev puas tsuaj: 100% ultrasonic kuaj (UT) rau kev puas tsuaj sab hauv; Magnetic particle testing (MT) los yog penetrant testing (PT) rau saum npoo ntawm cov khoom tseem ceeb.
- Dimensional raug soj ntsuam: Xyuas phaj thickness kam rau ua, flatness thiab nto zoo kom tau raws li cov neeg siv khoom yuav tsum tau ua.